Academic literature on the topic 'Ceramic'
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Journal articles on the topic "Ceramic"
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Scolaro, Juliano Milczewsky, Jefferson Ricardo Pereira, Accácio Lins do Valle, Gerson Bonfante, and Luiz Fernando Pegoraro. "Comparative study of ceramic-to-metal bonding." Brazilian Dental Journal 18, no. 3 (2007): 240–43. http://dx.doi.org/10.1590/s0103-64402007000300012.
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Dentists and technicians have used dental ceramics associated with different types of alloys without taking into account the characteristics of compatibility of these materials. Knowing the properties of the alloy and ceramic used in metal/ceramic restorations is a key factor for treatment success. The purpose of this study was to evaluate the bond strength of a palladium-silver alloy (Pors-on 4) to 3 ceramics (Ceramco, Noritake and Vita VMK-68) using shear forces at the metal-ceramic interface. A stainless steel cylindrical matrix was used for preparation of the metal dies, application of ceramic and shear strength testing. Thirty palladium-silver alloy cylinders received two layers of opaque and two layers of body porcelain, and shear tests were performed in a universal testing machine at a cross-head speed of 0.5 mm/min. Shear bond strength means (in MPa) were: 28.21(Ceramco), 28.96 (Noritake) and 24.11 (Vita VMK-68). One-way ANOVA did not show statistically significant differences (p>0.05) among the materials. The results of this study indicate that the three evaluated ceramic systems are suitable to be used in combination with the tested palladium-silver alloy.
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Colomban, Ph. "Gel technology in ceramics, glass-ceramics and ceramic-ceramic composites." Ceramics International 15, no. 1 (January 1989): 23–50. http://dx.doi.org/10.1016/0272-8842(89)90005-9.
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Lv, Xiang, Xinyu Liu, and Jiagang Wu. "Decoding the correlation between initial polarity and strain property of BNT-based ceramics." Journal of Applied Physics 132, no. 16 (October 28, 2022): 164101. http://dx.doi.org/10.1063/5.0121941.
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Although a large electric-induced strain has been obtained in sodium bismuth titanate (Bi0.5Na0.5TiO3, BNT)-based ceramics using chemical modifications, the effect of initial BNT-based ceramic's polarity on modulating strain properties was rarely reported. Herein, we comparatively studied the effect of tantalum (Ta) doping on two BNT-based ceramics with different ferroelectric polarities, namely, (Bi0.5Na0.5)0.935Ba0.065TiO3–0.7%Bi2FeCrO6 and (Bi0.98Gd0.02)0.5Na0.5TiO3. The former locates at the morphotropic phase boundary (MPB), whereas the latter is close to pristine BNT ceramics. An effective critical point, located at the crossover between ferroelectric and relaxor, is constructed in the former ceramic and significantly enhances strain properties, whereas a useless one is found in the latter ceramic due to the retention of a non-ergodic relaxor and has merely limited ability to promote strain properties. Our results demonstrate that the ferroelectric polarity of the initial BNT-based ceramic matrix also plays an important role in pursuing high strain properties.
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Cheng, Zhao Gang, Xin Hua Ni, and Xie Quan Liu. "The Mechanical-Stress-Field of Matrix in Eutectic Ceramic Composite." Applied Mechanics and Materials 121-126 (October 2011): 3607–11. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3607.
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Based on the interaction between nano-fiber and eutectic interphase, forth-phase mode is used to get the mechanical stress field of matrix in eutectic composite ceramics. The effective flexibility increment tensor of eutectic ceramic composite is obtained by the volumetric average strain. The remote stress boundary condition of the eutectic composite ceramis is accounted for getting the mechanical stress field in matrix. The results show the mechanical stress field of the matrix is associated with the stiffness and the volume fractions of each component in eutectic composite ceramic , the shape of interphase and nano-fiber. The stresses in matrix will decrease due to the strong constraining effects of the eutectic interphase. The eutectic interphase make the eutectic composite ceramics strengthen.
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Aronov, V., and T. Mesyef. "Wear in Ceramic/Ceramic and Ceramic/Metal Reciprocating Sliding Contact. Part 1." Journal of Tribology 108, no. 1 (January 1, 1986): 16–21. http://dx.doi.org/10.1115/1.3261136.
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This paper is the first of a series of two devoted to an investigation of wear mechanisms in ceramic/ceramic and ceramic/metal sliding contact tribological systems at high temperatures and exhaust gas environment. The first part presents results of the experiments carried out at room temperature and air environment. Scanning electron microscope, optical microscope and X-ray dispersion analysis were used for an identification of wear mechanisms. Surface geometry and morphology, friction coefficients and wear were determined as functions of sliding distance, nominal contact pressure, sliding velocity and mechanical properties of specimens (hardness and fracture toughness). The wear mechanism of ceramics rubbed against ceramics may be attributed to intensive plastic deformation of surfaces resulting in low cycle fatigue. The wear mechanism of ceramics rubbed against metals was polishing and surface fracture, while that of metals was adhesive transfer of material on to ceramic surfaces. Wear rates and friction coefficients were independent of mechanical properties of metallic samples.
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Jiang, Hong. "Research on Applied-Information Technology in Online Compact System Based on Serial Communication." Advanced Materials Research 1046 (October 2014): 431–35. http://dx.doi.org/10.4028/www.scientific.net/amr.1046.431.
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The ceramic industry fall into two main categories: daily used ceramics and craft ceramic. With the demand for daily used ceramics is increasing in my country, ceramics enterprises are faced with intense market competition. Based on the investigation of ceramic industrial production, the traditional method for Ceramic production has some disadvantages, such as long periods of dies production, complicated production process, wasting human resource, high cost, short life, poor quality, easy to damage. According to the characteristics of daily used ceramics, this paper presents a rapid prototyping system based on RS-232C compacts. This system can cancel the long and complex development process of the dies, and can achieve rapid prototyping of ceramic body, thereby greatly reducing the cost of production of ceramic manufacturers.
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Shi, Hao Yu, Runxuan Pang, Jing Yang, Di Fan, HongXin Cai, Heng Bo Jiang, Jianmin Han, Eui-Seok Lee, and Yunhan Sun. "Overview of Several Typical Ceramic Materials for Restorative Dentistry." BioMed Research International 2022 (July 18, 2022): 1–18. http://dx.doi.org/10.1155/2022/8451445.
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With the development of ceramic technology, prosthodontic ceramics are becoming a useful option for improving esthetic outcomes in dentistry. In this paper, various ceramic materials were reviewed and evaluated, and their advantages and disadvantages and indications in oral prosthodontics were analyzed objectively. The properties of resin-based ceramics, polycrystalline ceramics, and silicate ceramics were compared and analyzed. Resin-based ceramics may replace other ceramic materials in the CAD/CAM field.
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Yan, Yan Yan, Bo Zhao, and Jun Li Liu. "Research on the Fracture Phenomenon of Zirconia-Toughened Alumina Ceramics under Ultrasonic Vibration." Key Engineering Materials 455 (December 2010): 156–60. http://dx.doi.org/10.4028/www.scientific.net/kem.455.156.
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A study of the fracture phenomenon of zirconia-toughened alumina (ZTA) ceramics was carried. It analyzes the mechanisms of crack propagation of ZTA ceramics, and constructs fracture experiments of ZTA ceramics, so the propagation behavior on fracture in ZTA ceramics was investigated according to the experiment. By contrast, intercrystalline fracture happed in V-shaped groove of ceramic specimen under normal load without ultrasonic vibration during ceramic fracture, and transcrystalline fracture happed in V-shaped groove of ceramic specimen under normal load with ultrasonic vibration during ceramic fracture. Furthermore, the loading force of ceramic specimen under normal load with ultrasonic vibration is smaller than that under normal load without ultrasonic vibration all other conditions being equal. The results of fracture experiment prove that ultrasonic vibration assisted is good for the fracture of ceramic specimen, and it also proves that ultrasonic vibration assisted grinding may raise the working efficiency and improve surface integrity of ceramics from the standpoint of the fracture.
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Ding, Liang. "Analysis of Creative Teaching of Ceramics and Student Creativity in Colleges and Universities in China." Scientific and analytical journal Burganov House. The space of culture 18, no. 2 (May 10, 2022): 80–86. http://dx.doi.org/10.36340/2071-6818-2022-18-2-80-86.
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Ceramic art has been an important part of human culture for thousands of years and it has had a significant influence all over the world. China is the home country of ceramics and the progression of ceramic culture has contributed much to the development of human history and civilisation. Education has played a key role in this progression of ceramic art and through ceramics education, the ceramic culture, ceramic arts and the crafts of ceramics, ceramic skills have been passed down from one generation to the next. Ceramics education is an important part of art education. Faced with the globalisation of culture and economics, Chinese ceramic art education and global ceramic art education have a mutual influence on each other and are closely linked together. Therefore, achieving perfection and development in the ceramics education in Chinese universities, specifically in ceramics teaching, is important. In the long term, training students that have creative abilities will influence the current status and the future of ceramics education in China. Today, in China, ceramics are classified as either ‘handwork’ or ‘industrial arts’, focusing on production-oriented requirements like practicality, aesthetic appearance and economy. Ceramics teaching has been restricted by this traditional thinking as it conforms to existing stereotypes. Lacking an interactive paradigm that is open to change, the ceramics teaching in China attaches great importance to the mere training of skills. By analysing the current situation of ceramics education in colleges and universities in China, this paper discusses how to use creative teaching methods to guide students' learning consciousness, improve learning motivation and develop students' creativity from the perspectives of creative teaching and teaching creativity. This is to provide enlightening reflections on the cultivation of students' creativity in ceramics education in colleges and universities.
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Denny Sukma Eka Atmaja and Muhammad Kusumawan Herliansyah. "Optimasi Parameter Pengukuran Dimensi dan Defect Ubin Keramik dengan Metode Taguchi." Jurnal Sistem Cerdas 4, no. 3 (December 28, 2021): 171–79. http://dx.doi.org/10.37396/jsc.v4i3.182.
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The ceramics industry in Indonesia has a large contribution to the growth of various aspects in Indonesia. But in reality, there is still an imbalance between exports and imports for ceramic products. One way is to improve the quality of the ceramic industry in Indonesia. In fact, the ceramic quality inspection process in the ceramic industry is still done manually which can make mistakes in identifying defects. In this study, the design of variable identification system of ceramics was carried out specifically in the area of ceramics and dry spot defects on ceramic surfaces using image processing. Whereas to get a low error rate against the applicable variables, a design of experiment with the Taguchi approach is carried out. The results show that 50 cm distance, 300 lux light, 1x resize and 0.06 threshold can produce an image that has the smallest error value when identifying ceramic area and dry spot defects on the ceramic surface.
Dissertations / Theses on the topic "Ceramic"
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Dobedoe, Richard Simon. "Glass-ceramics for ceramic/ceramic and ceramic/metal joining applications." Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/4217/.
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The use of sintered cordierite/enstatite glass-ceramics as interlayers for joining silicon nitride to itself and to metals has been investigated. The role of the additives B203 and P205, which control the dynamics of sintering and crystallisation, has been studied using SEM, XRD and non-isothermal DTA-based measurements of activation energy. The measured activation energies for the crystallisation of μ-cordierite, for compositions with no additives, with B203 only, and with P205 only, did not differ significantly and were in the range 415-460 kJ mol-1. When both B203 and P205 were present this was increased to 503-524 kJ mol-1. The activation energy for α-cordierite formation when no additives were present was 952 ± 57 kJ mol-1. This was substantially reduced by the presence of B203 (540 ± 27 kJ mol-1), P205 (668 ± 41 kJ mol-1) and when both were present (352 ± 26 kJ mol-1). Cordierite/enstatite glass-ceramics have been successfully used to join silicon nitride to itself. Joining at 1050-1100'C in N2 with an applied load of ~ 2.5 MPa, resulted in joint strengths, measured in 4-pt bending, of 110-170 MPa. This is comparable to the intrinsic strength of the glass-ceramic and sufficient for practical applications. These strengths were obtained using an interlayer with a TCE (5.7 MK-1) greater than that of the silicon nitride (3.0 MK-1). Suggestions for further improvements to the joint strength are discussed. The use of a glass-ceramic joint with graded thermal expansion to bridge a TCE mismatch is discussed, and the geometrical restrictions on the joint, which limit possible practical applications, are outlined. The concept of a ceramic/metal compression joint with a glass-ceramic interlayer has been demonstrated for joining silicon nitride to both Nimonic alloy 80A and Ti. The requirements for continuity of electronic structure at the Nimonic 80A/glass-ceramic and the Ti/glass-ceramic interfaces are satisfied by reaction between the glass/glass-ceramic and, the pre-oxidised surface of the Nimonic alloy to form a MgTi205-Al2TiO5 solid solution phase, and the Ti to form Ti5Si3. For the lower WE mismatch (Ti-silicon nitride) the residual joining stresses generated on cooling were marginally too high and need to be further reduced, either by a slight alteration to the joint geometry and/or a smaller WE mismatch.
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Wade, James. "Contact damage of ceramics and ceramic nanocomposites." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/24932.
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Herein, we study the contact damage performance of two armour ceramics, alumina and silicon carbide, with varying microstructures and one particle-reinforced ceramic nanocomposite, alumina/silicon carbide, in an attempt to understand the microstructural mechanisms that affect plasticity and cracking under quasi-static and dynamic conditions. Quasi-static contact damage was imitated using Vickers indentation over a varying load regime. Numerical analysis of the indentation size effect, performed using the proportional specimen resistance model, allowed the contributions of plastic deformation and cracking to be separated into two individual values. In all three samples, higher levels of surface energy were found to correlate with increased amounts of cracking per unit area of indentation impression. Analytical modelling of crack initiation during Vickers indentation together with quantitative measurements of surface flaw populations revealed that such an increase in cracking damage was the result of higher densities of larger flaws. The hardness of the monolithic ceramics was found vary based on grain size and porosity levels, a smaller average grain size and lower porosity levels resulting in higher hardness values. In the nanocomposite materials, hardening was found to occur with further additions of silicon carbide nanoparticles. Such an effect has been attributed to the increased dislocation densities, as measured using Cr3+/Al2O3 fluorescence spectroscopy, and the impedance of dislocation movement within the lattice due to the presence of silicon carbide nanoparticles. In order to simulate dynamic contact damage, a low velocity, scaled-down drop-weight test was designed and developed. The dynamic contact damage resistance was determined based on the depth of penetration of a blunt indenter. In the monolithic ceramics, the indenter penetration was found to be shallower in materials of higher hardness. However, the nanocomposite materials displayed an opposing trend, the indenter penetration becoming deeper in the samples of higher hardness. The macro-scale fracture patterns produced during drop-weight impacts were seen to vary based on flaw populations and indenter penetration. In certain microstructures, extensive micro-cracking was also observed.
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VENTRELLA, ANDREA. "JOINING OF CERAMIC COMPOSITES AND ADVANCED CERAMICS." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2502686.
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Ceramics and Ceramic Matrix Composites (CMC) are well known as useful materials for harsh environment applications. Ceramic components have been widely used as abrasives, cutting tools, nuclear fuel elements, catalyst supports and astronomical telescope mirrors. Generally speaking, ceramics and CMC are excellent candidates for high-temperature applications because of their good mechanical properties and thermal stability at elevated temperatures.
However, to produce large-size and complex components, development and testing of joints for ceramics and CMC are fundamental. Joining materials and techniques currently available to join ceramic and CMC include diffusion bonding using various active fillers, transient eutectic phase methods such as nano-infiltration and transient eutectic-phase (NITE), laser joining, selected area chemical vapor deposition , glass-ceramic joining , solid state displacement reactions, preceramic polymer routes, reaction forming, brazing. Adhesive joining materials (e.g. epoxy resins) are used to join ceramics only for applications at temperature lower than 150 °C, i.e. adhesively bonded joints are widely used for automotive, aerospace, electronic and packaging applications.
Together with the need of a reliable joining method, a widely accepted standard to test the mechanical strength of joined ceramics and composites is still unavailable and measuring the shear strength of the same joining material with different test methods could lead to different results.
The aim of this Thesis is to compare and discuss several different shear strength tests used to join ceramics and CMC, with the final goal to provide designers and scientific community a widely accepted, reliable test method.
A homogeneous pure shear stress state is not obtainable with most of the currently used single or double lap tests, which give apparent and not pure shear strength of the joined samples; in addition, the presence of several different apparent shear strength tests in the literature makes comparison quite impossible.
The asymmetrical four point bending test (ASTM C1469-10) is recommended as a standard test by the ASTM to test joined ceramics and composites, but notches have to be cut in the joined area when the joining material strength is high. When the shear strength of the joining material approaches that of the substrate to be joined, ASTM C1469-10 is not suitable.
With torsion tests a pure shear loading strength can be measured without using notches.
One of the very first proposals for torsion test for epoxy bonded aluminum alloy samples was reported by M. Ouddane et al.: as thoroughly discussed there, torsion results were considered more reliable than those obtained by standard lap tests, the improvement mainly due to the fact that lap tests induce non uniform stress concentrations that affect the reliability of results.
Recent papers deal with torsion tests on joined hourglass shaped samples : preliminary results suggest that the torsion test method with a miniature specimen has a potential to evaluate the shear properties of the joint interface, provided that the fracture occurs in the joined area.
Torsion tests have been thoroughly analyzed in this Thesis: a pure non-uniform shear stress distribution is obtained with torsion tests; together with asymmetrical four point bending test (ASTM C1469-10), torsion test is the only one able to measure pure shear strength of joined ceramics and composites.
The torsion test method is proposed in some ASTM standards but none of them is directly applicable to joined ceramics: the main result of this Thesis is to demonstrate the reliability of torsion as a method to measure the shear strength of joined ceramics and CMC.
Two torsion standards have been adapted to joined C/C and ceramics, first by preparing square section samples (TS), rods (TC), tubes (TT), then by mechanically shaping the joined samples as a hourglass in different shapes.
The choice of an epoxy resin (Araldite AV119) to join SiC in this PhD thesis was done in order to have a “model” brittle joining material to obtain a statistically relevant number of joined samples in a reasonable time, to compare shear strength results .
More than one hundred joined samples have been prepared and tested at room temperature by asymmetrical four point bending (A4PB) (ASTM C1469-10), torsion on square section samples (TS), torsion on circular section rods (TC), torsion on hourglass shaped samples (THG, TDHG, TRHG), torsion of tubes (TT), single lap in compression (SL), single lap off set in compression (SLO), double lap off set in compression (DLO), Brazilian test (BT), double notch (DN) methods. A modified ASTM B898 standard has been used as a further example of single lap test in compression to complete the comparison work (B898).
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Mussi, Toschi Vitoria. "Lead-free ferroelectric ceramics for multilayer ceramic capacitors." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC089.
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De nos jours, la consommation des condensateurs céramiques multicouches (MLCCs) augmente en raison de leur efficacité et leur fiabilité. La miniaturisation résultant dans une plus grande dissipation volumique de chaleur et les nouvelles applications demandent des MLCCs qui peuvent travailler de 300 à 350°C, au-delà des limites actuelles de 200 – 250°C. De plus, les exigences environnementales augmentent également avec les réglementations REACH et RoHS qui interdisent l'utilisation du plomb en Europe. Il est donc impératif de créer des nouveaux matériaux sans plomb capables de répondre aux nouvelles attentes des MLCC.Cependant, la compatibilité avec les méthodes de production industrielle, ainsi que les prix du marché sont des limites importantes. Trois familles de matériaux sans plomb ont été examinées : celle du BaTiO3 (BT), du K0.5Na0.5NbO3 et du Na0.5Bi0.5TiO3 (NBT). Le NBT-BT à la MPB (6 % BT) a été choisi comme matériau diélectrique de base. Plusieurs méthodes et paramètres de synthèse ont ensuite été étudiés pour déterminer les meilleures conditions de synthèse. La synthèse à l'état solide et le frittage traditionnel ont été choisis pour les échantillons en massif et le coulage en bande a été choisi pour les couches. Pour éviter l'évaporation des espèces volatiles, le frittage a été effectué en couvrant le NBT-BT par une poudre de ZrO2. Tous les échantillons présentaient des phases secondaires contenant du Ba (Ba2TiO4 et Ba2Ti9O20) en raison de l'évaporation du Na pendant le frittage. Un effet de peau créé par la coexistence des phases tétragonale, rhomboédrique et cubique a également été observé, lié à la concentration locale de Ba dans le réseau cristallin du NBT. Les effets des paramètres de synthèse et la stœchiométrie des réactifs sur les propriétés diélectriques, la résistance d'isolement et la séparation des phases ont été analysés. La stœchiométrie nominale Na0.44Bi0.48Ba0.06TiO3 était la plus appropriée pour les MLCC en raison de sa résistance d'isolement élevée, de ses faibles pertes diélectriques et de sa stabilité de la permittivité en température. La présence de phases secondaires est initialement bénéfique en raison de l'élimination des lacunes d'oxygène. Au-delà d'une fraction volumique critique (2.5 à 3.0 %) et d'une taille de grain moyenne critique (0.9 à 3.0 m2), la tendance s'inverse en raison de la nature conductrice des phases secondaires.Pour atteindre la fraction volumique et la taille de grain critiques, un agent dispersant a été utilisé lors du broyage dans la jarre de YSZ, avec du MEK et de l'éthanol comme solvants, et sans sécher les réactifs avant la pesée. Enfin, la relaxation des contraintes a été réalisée à 400°C pendant 3 heures. Trois modèles ont été utilisés pour expliquer la dispersion des propriétés diélectriques en fréquence : le modèle de Maxwell-Wagner, le modèle de Nyquist et la loi de Curie-Weiss modifiée. Les incompatibilités entre les propriétés diélectriques du NBT-BT rapportées dans la littérature ont ensuite été analysées soulignant l'importance d'avoir des méthodes de synthèse et de mesure strictes. Les trois principaux facteurs affectant les propriétés diélectriques induisant ces incompatibilités étaient la stœchiométrie, la méthode de métallisation et la fixation des fils électriques à l'aide de la laque d'argent. Des pertes diélectriques croissantes à haute température a aussi été observée après chaque cycle thermique dépassant les 300°C, indiquant une dégradation thermique des échantillons.Enfin, les monocouches céramiques ont montré une faible densité (62%) après frittage, limitant la plage de température correspondant aux spécifications d'Exxelia. Cependant, en utilisant un pressage des couches avant frittage, l'échantillon multicouche fritté présentait une densité élevée (89%). Une mesure des propriétés diélectriques doit être effectuée sur cet échantillon multicouche synthétisé, afin de déterminer sa compatibilité avec les spécifications d’ExxeliaMLCC consumption is today increasing due to their high efficiency, reliability and frequency characteristics. MLCCs that can work from 300 to 350°C are required both for miniaturization, resulting in greater volume heat dissipation and for new applications. Moreover, environmental requirements are also increasing, the REACH and RoHS regulations prohibiting the use of lead in Europe. It is imperative to create new lead-free materials that are able to meet those requirements.However, the compatibility with the production methods, price, and market are important industrial limitations that need to be considered.Three families of lead-free materials were examined: BaTiO3-based, K0.5Na0.5NbO3-based and Na0.5Bi0.5TiO3-based materials. NBT-BT at the morphotropic phase boundary (6% BT) was chosen as the base dielectric material.Several synthesis methods and parameters were studied to determine the best synthesis conditions. Solid-state synthesis and traditional sintering were chosen for the bulk samples and tape casting was chosen for the layer samples preparation. Sintering was done under ZrO2 powder to prevent the evaporation of volatile species.All samples had secondary Ba-containing phases (Ba2TiO4 and Ba2Ti9O20) formed because of the evaporation of Na during sintering. A skin-effect was observed due to a phase coexistence (tetragonal, rhombohedral, and cubic) due to the local concentration of Ba in the NBT lattice.The effects of the synthesis parameters and the stoichiometry of the reactants on dielectric properties, insulation resistance, and phase separation were analysed.The Na0.44Bi0.48Ba0.06TiO3 nominal stoichiometry was the most suitable for the MLCCs due to its high insulation resistance, low dielectric losses, and stability of permittivity in temperature.The phase separation was initially beneficial, due to the resulting elimination of oxygen vacancies. Above a critical volume fraction (2.5 to 3.0%) and a critical mean surface area (0.9 to 3.0 m2), the trend was reversed due to the conductive nature of the secondary phases.To achieve the critical volume fraction and surface area of the secondary phases, a dispersing agent was used during ball-milling in YSZ jar, with MEK and ethanol as solvents, and without drying the reactants prior to weighing. Finally, a strain relaxation was done at 400°C for 3 hours.Three models explained the frequency dispersion of the dielectric properties: the Maxwell-Wagner model, the Nyquist plot and the modified Curie-Weiss law.Incompatibilities between the dielectric properties of NBT-BT reported in the literature were then analysed, showing the importance of maintaining strict synthesis and measurement methods. The three main factors affected the dielectric properties, creating these incompatibilities in the bulk samples. There were the stoichiometry, the metallization method, and the fixing of the electrical leads using silver paste.An increase of the high-temperature dielectric losses after each thermal cycle reaching more than 300°C was observed, indicating a thermal degradation of the material.Finally, the sintered ceramic monolayers showed a low density (62%), limiting the temperature range corresponding to Exxelia’s specifications. However, after pressing the layers together before sintering, the sintered multilayer sample showed a high density (89%). Dielectric property measurement should be carried out for these synthesized multilayers
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Minatti, José Luiz [UNESP]. "Desenvolvimento de cerâmicas de mulita a partir de alumina, ácido silícico e aerosil." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/103747.
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minatti_jl_dr_guara.pdf: 4184715 bytes, checksum: be99db6c3fdb82f4af8b5cf4d8f633d9 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho, apresenta-se uma rota alternativa para produção de cerâmicas de mulita (3Al2O3.2SiO2), a partir da mistura de pós de alumina (Al2O3) e sílica (SiO2), para uma possível aplicação em um dispositivo de perfuração de rochas por jato supersônico quente (thermal spallation). Os pós precursores foram utilizados de dois modos diferentes: no primeiro com tamanho micrométrico, tal como fornecido pelos fabricantes; no segundo, a alumina foi moída e misturada separadamente com ácido silícico e aerosil nanométricos, ambos usados como fontes de sílica. O processo consistiu basicamente na mistura a úmido dos pós, secagem, prensagem e sinterização. Além do tamanho das partículas dos pós, foi avaliada a influência da pressão de prensagem (40 a 300 MPa), dos aditivos de sinterização (MgO, CaO e Y2O3), do meio de dispersão (água e álcool), da calcinação dos pós, da temperatura (1600 e 1650 ºC) e do tempo (1 e 3h) de sinterização. As cerâmicas obtidas foram caracterizadas de acordo com a contração, perda de massa, porosidade e densidade aparente e resistência à flexão. A microestrutura foi caracterizada por meio da microscopia óptica e microscopia eletrônica de varredura (MEV), e complementada com difração de raios X. Os resultados obtidos mostram que cerâmicas de mulita para aplicações comerciais, que requerem resistência mecânica até aproximadamente 207 MPa, podem ser obtidas utilizando pós de alumina moída e aerosil 380, com 1 % de CaO, homogeneizadas com álcool, calcinadas a 600 ºC, prensadas com 160 MPa (ou mais), pré-sinterizadas a 1000 ºC por 1h e sinterizadas a 1650 ºC por 1h. Estas cerâmicas demonstram também, grande potencial para uso em queimadores para fornos e tubeiras para thermal spallation.
The present study was made in order to obtain an alternative process to produce mullite ceramic (3Al2O3.2SiO2), from powder mixture of alumina (Al2O3) and silica (SiO2), for a possible use in a device for rock drilling hot supersonic jet (thermal spallation). The precursors powders were employed in two different ways: the first powder, in micrometric size, was used as supplied by the manufacturer; the second, milled alumina was alternated with silicic acid and nanometric aerosil®, both used as silica sources. The ceramic processing consisted basically of four steps: mixture of humid powders, drying, pressing and sintering. Besides the powder particle size, it was also evaluated the influence of the pressing (40 to 300 MPa), the sintering additives (MgO, CaO and Y2O3), the middle of dispersion (water and alcohol), the powder calcination and the time (1 and 3h) and sintering temperature (1600 and 1650 ºC). The obtained ceramics were characterized according to the contraction, mass loss, porosity, densification and resistance to flexing. The microstructure was analyzed by light microscopy, scanning electron microscopy (SEM) besides X-ray diffraction. The obtained results show that mullite ceramic for commercial applications requiring mechanical resistance up to about approximately 207 MPa, it can be obtained using milled alumina powder and aerosil 380® with 1 % CaO, homogenized with alcohol, calcined in 600 ºC, pressed with 160 MPa (or more), pre-sintered to 1000 ºC for 1h and sintered to 1650 ºC for 1h. These ceramic also show, great potential to be used in burners for ovens and nozzles for thermal spallation.
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Sütçü, Mücahit Akkurt Sedat. "Development of Dense Ceramic Tiles From Mixtures of Alumina Powders With Different Psd/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000462.pdf.
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Hill, Arnold Hill. "PRODUCTION OF BULK CERAMIC SHAPES FROM POLYMER DERIVED CERAMICS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4248.
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A method has been developed to produce bulk ceramic components from a class of ceramics known as polymer derived ceramics. In the past polymer derived ceramics have been limited to thin film applications or in the fabrication of MEMS devices. The reason being that when the polymer is into a ceramic, large quantities of gas are generated which produce internal pressure that fractures the ceramic components. The method developed here solves that issue by casting into the polymer a 3 dimensional network of polymer fibers in the form of a foam which, during pyrolysis, burns out and leaves a network of open channels that allows decomposition gases to escape thus preventing pressure from building up. The inclusion of the polymer foam allows for the formation of strong plastic like green bodies which can be machined into any shape. The green bodies are then pyrolized into ceramic components. This process allows for the simple and inexpensive fabrication of complex ceramic components that have the potential to replace current components that are made with traditional methods.M.S.M.S.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science & Engr MSMSE
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Feilden, Ezra. "Additive manufacturing of ceramics and ceramic composites via robocasting." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/55940.
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In the last two decades additive manufacturing (AM) has emerged as a highly important and influential technology. A large range of approaches to AM have been developed which give rise to hundreds of distinct techniques. Many of these are specific to one material system, and only a handful have been successful at producing ceramic parts. Robocasting is one such technique, having been used to produce complex ceramic parts with reasonable mechanical properties. In this thesis robocasting is investigated further, firstly by characterising the rheology of the robocasting paste, and then by measuring the strength and reliability of ceramic parts produced by robocasting. The critical defects associated with the process are identified, and efforts have been made to eliminate them. Furthermore, it was possible to produce a new class of ceramic composites consisting of alumina platelets aligned by the shear forces that arise during printing. These platelets themselves and the composites were extensively characterised. A new in-situ double cantilever test was developed in order to study the fracture behaviour of the composites. Lastly, the principle of using the printing process to align platelets was applied to fibres in order to create printed fibre reinforced ceramic matrix composites, and printed carbon fibre reinforced epoxy.
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Boismenu, Nicholas. "Indirect Measure." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3351.
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This paper is in support of my thesis exhibition “Indirect Measure” May 5th – June 3rd 2017, at the Reece Museum, located on the campus of East Tennessee State University. This document is an account of my examination into what constitutes art and the change in my perception of the utilitarian ceramic vessel during my research into the perceived difference between craft and art. Using broad definitions, I define what I believe art to be and how it is different from, and the same as craft.
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Adicks, Michael Kent. "Strength characterization of thin-wall hollow ceramic spheres from slurries." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/9318.
Full textBooks on the topic "Ceramic"
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R, Levine Stanley, ed. Ceramics and ceramic-matrix composites. New York, N.Y: American Society of Mechanical Engineers, 1992.
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Design, innovazione e cultura del territorio: Ceramica Fioranese fra prodotto e processo. Bologna]: Logo Fausto Lupetti editore, 2020.
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Society, American Ceramic. Ceramic source. [Columbus, Ohio]: The Society, 1986.
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(Firm), Knovel, ed. Handbook of ceramic composites. Boston: Kluwer Academic Publishers, 2005.
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Vary, Alex. NDE of ceramis and ceramic composites. [Washington, DC]: National Aeronautics and Space Administration, 1991.
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Shi, Feng. Ceramic materials: Progress in modern ceramics. Rijeka, Croatia: InTech, 2012.
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Ontario, Ministry of Industry Trade and Technology. The Impact of advanced ceramics on Ontario industry: An overview = L'effet des céramiques de pointe sur l'industrie en Ontario : aperçu. [Toronto]: Technology Policy Branch, Ontario Ministry of Industry, Trade and Technology, 1988.
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Pampuch, Roman. ABC of contemporary ceramic materials. Faenza, Italy: Techna Group, 2008.
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Ceramic hardness. New York: Plenum Press, 1990.
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D, Peteves S., Commission of the European Communities., and European Colloquium on "Designing Interfaces for Technological Applications: Ceramic-Ceramic, Ceramic-Metal Joining (1988 : Petten, Netherlands), eds. Designing interfaces for technological applications: Ceramic-ceramic ceramic-metal joining. London: Elsevier Applied Science, 1989.
Find full textBook chapters on the topic "Ceramic"
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Kenanidis, Eustathios, Panagiotis Kakoulidis, and Eleftherios Tsiridis. "Ceramic on Ceramic." In The Adult Hip - Master Case Series and Techniques, 379–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-64177-5_16.
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Buchanan, James M., and Sally Goodfellow. "Hydroxyapatite Ceramic Hip Survey: Ceramic/Ceramic Bearings." In Bioceramics 20, 1283–86. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-457-x.1283.
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Gooch, Jan W. "Ceramic." In Encyclopedic Dictionary of Polymers, 131. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2159.
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Niwa, Koichi, Koji Omote, Yasushi Goto, and Nobuo Kamehara. "Ceramic-Metal Interfaces in Electronic Ceramics —Interface Between Ain Ceramics and Conductors." In Ceramic Microstructures, 391–97. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5393-9_37.
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Schmidt, Helmut, Frank Tabellion, Karl-Peter Schmitt, and Peter-William Oliveira. "Ceramic Nanoparticle Technologies for Ceramics and Composites." In Ceramic Transactions Series, 171–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406083.ch18.
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Li, Mao Qiang. "Making Fluorophlogopite Ceramics through Ceramic Processing." In Key Engineering Materials, 1833–35. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1833.
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Shanaghi, Ali, Paul K. Chu, Ali Reza Souri, and Babak Mehrjou. "Advanced Ceramics (Self-healing Ceramic Coatings)." In Advanced Ceramics, 137–74. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-43918-6_4.
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Witvoet, J., R. Nizard, and L. Sedel. "Ceramic on Ceramic Bearing Surfaces." In Interfaces in Total Hip Arthroplasty, 143–50. London: Springer London, 2000. http://dx.doi.org/10.1007/978-1-4471-0477-3_13.
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Moreno, Rodrigo. "Colloidal Processing of Ceramic-Ceramic and Ceramic-Metal Composites." In Ceramic Transactions Series, 145–59. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144442.ch13.
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Nicholas, M. G. "Material Aspects of Ceramic-Ceramic and Ceramic-Metal Bonding." In Advanced Joining Technologies, 160–71. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0433-0_13.
Full textConference papers on the topic "Ceramic"
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Easley, M. L., and J. R. Smyth. "Ceramic Gas Turbine Technology Development." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-367.
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Under the U.S. Department Of Energy/National Aeronautics and Space Administration (DOE/NASA) funded Ceramic Turbine Engine Demonstration Program, AlliedSignal Engines is addressing the remaining critical concerns slowing the commercialization of structural ceramics in gas turbine engines. These issues include demonstration of ceramic component reliability, readiness of ceramic suppliers to support ceramic production needs, and enhancement of ceramic design methodologies. The AlliedSignal/Garrett Model 331-200[CT] Auxiliary Power Unit (APU) is being used as a ceramics test bed engine. For this program, the APU First-stage turbine blades and nozzles were redesigned using ceramic materials, employing the design methods developed during the earlier DOE/NASA funded Advanced Gas Turbine (AGT) and Advanced Turbine Technologies Application Project (ATTAP) programs. The present program includes ceramic component design, fabrication, and testing, including component bench tests and extended engine endurance testing and field testing. These activities will demonstrate commercial viability of the ceramic turbine application. In addition, manufacturing process scaleup for ceramic components to the minimum level for commercial viability will be demonstrated. Significant progress has been made during the past year. Engine testing evaluating performance with ceramic turbine nozzles has accumulated over 910 hours operation. Ceramic blade component tests were performed to evaluate the effectiveness of vibration dampers and high-temperature strain gages, and ceramic blade strength and impact resistance. Component design technologies produced impact-resistance design guidelines for inserted ceramic axial blades, and advanced the application of thin-film thermocouples and strain gages on ceramic components. Ceramic manufacturing scaleup activities were conducted by two ceramics vendors, Norton Advanced Ceramics (East Granby, CT) and AlliedSignal Ceramic Components (Torrance, CA). Following the decision of Norton Advanced Ceramics to leave the program, a subcontract was initiated with the Kyocera Industrial Ceramics Company Advanced Ceramics Technology Center (Vancouver, WA). The manufacturing scaleup program emphasizes improvement of process yields and increased production rates. Work summarized in this paper was funded by the U.S. Dept. Of Energy (DOE) Office of Transportation Technologies, part of the Turbine Engine Technologies Program, and administered by the NASA Lewis Research Center, Cleveland, OH under Contract No. DEN3-335.
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Rettler, M. W., M. L. Easley, and J. R. Smyth. "Ceramic Gas Turbine Technology Development." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-207.
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Under the U.S. Dept. of Energy/National Aeronautics and Space Administration (DOE/NASA) funded Ceramic Turbine Engine Demonstration Project, formerly the Advanced Turbine Technology Applications Project (ATTAP), AlliedSignal Engines is addressing the remaining critical concerns slowing the commercialization of structural ceramics in gas turbine engines. These issues include demonstration of ceramic component reliability, readiness of ceramic suppliers to support ceramic production needs, and development of ceramic design technologies. The AlliedSignal/Garrett Model 331-200[CT] Auxiliary Power Unit (APU) is being used as a ceramics test bed engine. The first-stage turbine blades and nozzles were redesigned using ceramic materials, employing the design methods developed during the earlier DOE/NASA-funded Advanced Gas Turbine (AGT) and ATTAP programs. Ceramic engine components have been fabricated and are now being evaluated in laboratory engine testing. The fabrication processes for these components will provide the framework for a demonstration of manufacturing process scale-up to the minimum level for commercial viability. The laboratory engine testing is helping to refine the component designs and focus the development of ceramic component technologies. Extended engine endurance testing and field testing in commercial aircraft is planned to demonstrate ceramic component reliability. Significant progress has been made during 1994. An engine with ceramic turbine nozzles was successfully operated and engine tests in the laboratory are continuing to gather useful data. An engine equipped with ceramic blades was also tested, but blade fractures occurred, interrupting operation. An extensive investigation has identified possible vibration and contact problems. Investigative evaluation efforts are continuing to identify the problem source and determine go-forward plans for ceramic blade development. Component design technologies have progressed in the areas of modeling particle impact pulverization, development of a ceramic hot corrosion environmental life model, and methods for evaluating ceramic contact damage. The planned ceramic manufacturing scale-up was initiated with two ceramics vendors, Norton Advanced Ceramics (East Granby, CT) and AlliedSignal Ceramic Components (Torrance, CA). The scaleup demonstration program is emphasizing improvement of ceramic processing yields and increased production rates. Work summarized in this paper was funded by the U.S. Dept. of Energy (DOE) Office of Transportation Technologies, as part of the Turbine Engine Technologies Program, and administered by the NASA Lewis Research Center, Cleveland, OH under Contract No. DEN3-335.
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Sova, A., V. Kosarev, A. Papyrin, and I. Smurov. "Effect of The Ceramic Component on Cold Sprayed Metal Ceramic Coatings." In ITSC2010, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. DVS Media GmbH, 2010. http://dx.doi.org/10.31399/asm.cp.itsc2010p0548.
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Abstract Spraying metal-ceramic coatings is a complicated task because, in addition to the spray parameters of the metal particles, it is necessary to take into account those of ceramics. This paper presents some results concerning the effect of the nature, particle size, and velocity of ceramics on the metal-ceramic coating properties. Copper and aluminium powders are used as metal components. Two fractions (fine and coarse) of aluminium oxide and silicon carbide are sprayed in the tests. Ceramic particle velocity is varied by the particle injection into different zones of the gas flow: in the subsonic (pre-chamber) and supersonic parts of the nozzle, and in the free jet after the nozzle exit. Simulation results and measurements of the particle velocity by the track method are compared. Influence of the ceramic particle parameters on the coating formation process and its properties is discussed.
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Kinney, Troy W., and Michael L. Easley. "Ceramic Gas Turbine Technology Development." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-465.
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Under the U.S. Dept. of Energy (DoE) funded Ceramic Turbine Engine Demonstration Project (CTEDP), AlliedSignal Engines is addressing remaining critical concerns slowing the commercialization of structural ceramics in gas turbine engines. These issues include demonstration of ceramic component reliability, readiness of ceramic suppliers to support ceramic production needs, and development of ceramic design technologies. The AlliedSignal/Garrett Model 331-200[CT] auxiliary power unit (APU) is being used as a ceramics test bed engine. The first-stage turbine blades and nozzles were redesigned for ceramic materials, employing design methods developed during the earlier Dept. of Energy/National Aeronautics and Space Administration (DoE/NASA)-funded Advanced Gas Turbine (ACT) and Advanced Turbine Technology Applications (ATTAP) programs. The fabrication processes for these components provide the framework for demonstration of ceramic manufacturing process scale-up to the minimum level for commercial viability. Ceramic engine components have been fabricated and are now being evaluated in laboratory engine testing. This testing is helping to refine the component designs and focus the development of ceramic component technologies. Extended engine endurance testing and field testing in commercial aircraft is planned, to demonstrate ceramic component reliability. Significant progress was made during 1996 in the ceramic component manufacturing scale-up activities. The CTEDP ceramics subcontractors, AlliedSignal Ceramic Components (Torrance, CA) and Kyocera Industrial Ceramics Corporation (Vancouver, WA) demonstrated increased capacity and improved yields of silicon nitride materials. Planned ceramic turbine nozzle manufacturing demonstrations were initiated by both companies. Ceramic design technology was further refined in several areas. Work continued in defining boundary conditions for impact modeling of ceramic turbine engines, including completion of a three-dimensional trajectory analysis for combustor carbon particles in the engine flowpath. Contact rig tests and supporting analyses helped define the effectiveness of compliant layers in reducing ceramic turbine blade attachment contact stresses, and the results are aiding the evolution of more effective compliant layer configurations. This work supported evaluation of various ceramic turbine blade attachment designs in subelement and engine tests. Thin-film strain gage technology for measuring vibratory levels at high temperatures was successfully applied on ceramic turbine blades. Ceramic materials were screened for susceptibility to cyclic hot corrosion fatigue at the conditions affecting turbine blades. Stress rupture testing in support of the proof test methodology development was completed. Engine endurance tests with ceramic turbine nozzles accumulated over 482 additional hours of successful operation. Ceramic turbine blades were successfully demonstrated in over 190 hours of engine operation. This work brought the combined ceramic component engine test experience to over 1500 operating hours. Work summarized in this paper was funded by the DoE Office of Transportation Technologies, as part of the Turbine Engine Technologies Program, and administered through Fiscal Year 1996 by the NASA Lewis Research Center, Cleveland, OH under Contract No. OEN3-335.
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Easley, Michael L., Bjoern Schenk, and Hongda Cai. "Ceramic Gas Turbine Technology Development." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-553.
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AlliedSignal Engines is addressing critical concerns slowing commercialization of structural ceramics in gas turbines. The AlliedSignal 331-200[CT] APU test bed features ceramic first-stage nozzles and blades. Fabrication of ceramic components provides manufacturing process demonstration scale-up to minimum levels for commercial viability. Endurance tests and field testing in commercial aircraft will demonstrate component reliability. Manufacturing scale-up activities showed significant progress in 1997. Subcontractors AlliedSignal Ceramic Components (CC, Torrance, CA) and Kyocera Industrial Ceramics Corporation (KICC, Vancouver, WA), transitioned process refinements to demonstration. CC initiated trial production of 100 nozzles/month. These suppliers are also developing fixed processes to fabricate ceramic integrally-bladed turbine rotors (“blisks”). Ceramic design technology advanced with carbon particle impact testing supporting impact model verification, and 300 hours successful engine testing of longer-life inserted blade attachment compliant layers. Ceramic turbine nozzles were readied for planned field demonstrations with 473 hours of engine testing. This work was funded as part of the Turbine Engine Technologies Program by the DoE Office of Transportation Technologies under Contract No. DE-AC02-96EE50454.
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Easley, Michael L., Bjoern Schenk, and Hongda Cai. "Ceramic Gas Turbine Technology Development." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-554.
Full textAbstract:
AlliedSignal Engines is addressing critical concerns slowing commercialization of structural ceramics in gas turbines. The AlliedSignal 331-200[CT] APU test bed features ceramic first-stage nozzles and blades. Fabrication of ceramic components provides manufacturing process demonstration scale-up to minimum levels for commercial viability. Endurance tests and field testing in commercial aircraft will demonstrate component reliability. Manufacturing scale-up activities showed significant progress in 1997. Subcontractors AlliedSignal Ceramic Components (CC, Torrance, CA) and Kyocera Industrial Ceramics Corporation (KICC, Vancouver, WA), transitioned process refinements to demonstration. CC initiated trial production of 100 nozzles/month. These suppliers are also developing fixed processes to fabricate ceramic integrally-bladed turbine rotors (“blisks”). Ceramic design technology advanced with carbon particle impact testing supporting impact model verification, and 300 hours successful engine testing of longer-life inserted blade attachment compliant layers. Ceramic turbine nozzles were readied for planned field demonstrations with 473 hours of engine testing. This work was funded as part of the Turbine Engine Technologies Program by the DoE Office of Transportation Technologies under Contract No. DE-AC02-96EE50454.
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Smyth, J. R., R. E. Morey, and R. W. Schultze. "Ceramic Gas Turbine Technology Development and Applications." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-361.
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Under the ongoing DOE/NASA-funded Advanced Turbine Technology Applications Project (ATTAP), Garrett Auxiliary Power Division (GAPD) is continuing to address the issues of developing and applying structural ceramics to production gas turbine engines. Several critical technologies are being developed to advance this issue, including design methods development, component design, component fabrication, material characterization, and engine testing. The brittle nature of structural ceramics highlights concerns regarding impact damage. Through analysis and experimentation, design methods are being developed to improve the resistance of ceramic components to impact damage. Ceramic component designs now integrate these design methods into practice and proof testing methods are being developed to verify the results for actual engine components. Ceramic component fabrication processes are being optimized by selected subcontractors, resulting in deliveries of high-quality ceramic components which fully meet engine test needs. Verification of the component material properties is being achieved through comparisons of material property data from test bars cut from actual engine components with data generated from ceramic material test specimens. All these efforts are aimed at demonstrating endurance of the AGT101 all-ceramic turbine engine at the maximum operating temperature conditions up to 2500F (1371C). These critical ceramics technologies being developed under ATTAP are also providing a critical launch pad into production-oriented programs. GAPD has three concurrent programs underway, aimed at integrating ceramics into production Auxiliary Power Units (APUs). These include: installing and evaluating ceramic turbine nozzles under actual field conditions in a well-established product line (the 85 Series Ceramic Nozzle Demonstration Program); incorporating ceramic first-stage turbine stators and blades in a three-stage axial turbine APU (the 331-200 Ceramic Demonstration Program); and incorporation of a ceramic first-stage turbine stator in our latest APU design, the G250 Auxiliary Power Generation System (APGS) for the USAF F-22 fighter aircraft.
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Schenk, Bjoern. "Ceramic Gas Turbine Technology Development." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-315.
Full textAbstract:
AlliedSignal Engines is addressing the critical concerns that are slowing commercialization of structural ceramics in gas turbines. The 331-200[CT] auxiliary power unit (APU) test bed features ceramic first-stage nozzles and blades. Fabrication of ceramic components provides manufacturing process demonstration scale-up to the minimum levels needed for commercial viability. On-site endurance tests are demonstrating component reliability, and additional field testing in APUs onboard commercial aircraft and stationary industrial engines is planned. Manufacturing scale-up activities showed significant progress during 1998. Subcontractors AlliedSignal Ceramic Components (Torrance, CA) and Kyocera Industrial Ceramics Corporation (Vancouver, WA) transitioned process refinements to full demonstration. Both suppliers achieved demonstration capability of ceramic nozzle production at the rate of 100 pieces/month. These suppliers are also developing fixed processes to fabricate ceramic integrally-bladed turbine rotor disks (“blisks”). Ceramic design technology advanced, and 776 hours engine operational testing of a ceramic blisk were successfully completed. Ceramic turbine nozzles were readied for planned field demonstrations, with 2.213 hours of engine endurance testing completed. High-temperature ceramic material tests in the cyclic oxidation test rigs were initiated, to establish functional operating temperature limits for current silicon nitride materials in gas turbine environments. This work was funded as part of the Turbine Engine Technologies Program by the U.S. Dept. of Energy Office of Transportation Technologies under Contract No. DE-AC02-96EE50454.
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Bornemisza, Tibor. "Ceramic Small Gas Turbine Technology Demonstrator." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-306.
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Requirements for increased power density, improved fuel economy, and rapid start demand higher turbine inlet temperatures and turbine wheel tip speeds, resulting in the need for materials with high strength to weight ratio at temperatures in excess of 2000°F. High performance ceramics appear to be the most promising substitutes for the current cobalt-nickel based superalloys. The numerous advantages of ceramics are coupled with several unfavorable properties, such as the brittleness, the low reliability of the ceramic pans, and the lack of established design, manufacturing and inspection techniques. The development of reliable components requires a close cooperation between the user and the manufacturer of the high performance ceramics. Sundstrand Power Systems has been involved with the development of ceramic gas turbine components since 1972. The current Research and Development effort involves the demonstration of ceramic turbine components operating at 2200°F turbine inlet temperature. Silicon nitride turbine wheel and stationary components were designed and subjected to a series of tests in the Gemini small gas turbine modified for this purpose. Engine start to full speed in 2.5 seconds and continuous operation at 2300°F was demonstrated. The successful testing of the ceramic turbine components demonstrated the feasibility of the currently available structural ceramic materials for non-flight-critical and unmanned turbine applications.
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Jimenez, Oscar, John McClain, Bryan Edwards, Vijay Parthasarathy, Hamid Bagheri, and Gary Bolander. "Ceramic Stationary Gas Turbine Development Program — Design and Test of a Ceramic Turbine Blade." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-529.
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The goal of the Ceramic Stationary Gas Turbine (CSGT) Development Program, under the sponsorship of the United States Department of Energy (DOE), Office of Industrial Technologies (OIT), is to improve the performance (fuel efficiency, output power, and exhaust emissions) of stationary gas turbines in cogeneration through the selective replacement of hot section components with ceramic parts. This program, which is headed by Solar Turbines Incorporated and supported by various suppliers, and national research institutes, includes detailed engine and component design, procurement, and field testing. A major challenge in the successful introduction of ceramic parts into a gas turbine is the design of the interface between the ceramic parts and metallic hardware. A turbine blade, which incorporated a dovetail root, was designed with such considerations. A relatively thin compliant layer between the ceramic-metallic loading surface was considered for equalizing pressure face load distributions. Five monolithic siliocn nitride ceramic materials were considered: AS800 and GN10, AlliedSignal Ceramic Components; NT164, Norton Advanced Ceramics; SN281 and SN253, Kyocera Industrial Ceramics Corporation. The probability of survival using NASA/CARES for 30,000 hours of engine operation was calculated for each material. The blade frequencies, stresses, and temperatures were predicted. The influence of the dovetail angle was also analyzed to determine the most optimum configuration. Prior to engine installation all blades underwent extensive nondestructive evaluation and spin proof testing. This paper will review the design, life prediction, and testing of the first stage ceramic turbine blade for the Solar Turbines Centaur 5OS engine.
Reports on the topic "Ceramic"
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Pilania, Ghanshyam. Misfit dislocations at metal-ceramic and ceramic-ceramic interfaces. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1184608.
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Clarke, D. R., and D. Wolf. Grain boundaries in ceramics and ceramic-metal interfaces. Office of Scientific and Technical Information (OSTI), January 1986. http://dx.doi.org/10.2172/6923214.
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Vedula, Krishna M. Ultra High Temperature Ceramic-Ceramic Composites. Fort Belvoir, VA: Defense Technical Information Center, October 1989. http://dx.doi.org/10.21236/ada230593.
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Tortorelli, P. F. High-temperature corrosion resistance of ceramics and ceramic coatings. Office of Scientific and Technical Information (OSTI), June 1996. http://dx.doi.org/10.2172/450771.
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Alivisatos, A. P. Ceramic Nanocrystals. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada400094.
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Holmes, B. L., and M. A. Janney. Ceramic filters. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/220576.
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Yet-Ming Chiang. Ceramic Interfaces. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/839143.
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