Relevant bibliographies by topics / In situ ceramic composite

Academic literature on the topic 'In situ ceramic composite'

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Published: 14 March 2023

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Journal articles on the topic "In situ ceramic composite"

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Zhang, Guo Jun, Hideki Kita, Naoki Kondo, and Tatsuki Ohji. "Strengthening Effect of In-Situ Dispersed Hexagonal Boron Nitride in Ceramic Composites." Key Engineering Materials 317-318 (August 2006): 163–66. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.163.

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High strength particulate ceramic composites are in general reinforced by strong dispersoids, such as strong ceramic particles (SiC, TiB2, ZrO2, et al) and strong metallic particles (Mo, W, et al). In this work high strength ceramic composites with in-situ synthesized hexagonal boron nitride (h-BN) have been prepared and characterized. As an example, we manufactured mullite-BN composites by reactive hot pressing (RHP) using aluminum borates (9Al2O3·2B2O3 and 2Al2O3·B2O3) and silicon nitride as starting materials. The obtained material RHPed at 1800°C showed a strength of 540 MPa, which was 1.64 times higher than that of the monolithic mullite ceramics. TEM observation revealed that the composite had an isotropic microstructure with a fine mullite matrix grain size of less than 1 μm and a nano-sized h-BN platelets of about 200 nm in length and 60∼80 nm in thickness. The high strength was suggested to be from the reduced matrix grain size and the small toughening effect by the h-BN platelets. In addition, this kind of ceramic composite demonstrates low Young’s modulus that is beneficial to the thermal/mechanical shock resistance, and excellent machinability.
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Zhao, Zhong Min, Long Zhang, Hong Bai Bai, Jian Zheng, Jian Jiang Wang, and Y. Fu. "Fabrication of Nano-Micron Al2O3-ZrO2 Ceramic Eutectic Composites from the Melts by the SHS Metallurgical Process." Key Engineering Materials 280-283 (February 2007): 1053–56. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1053.

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New nano-submicron textured Al2O3-ZrO2 ceramic eutectic composites were obtained from high-temperature melts produced by the SHS metallurgical process with intro-granular and 1-3 composite structures. Nano-micron textured ceramic composites were naturally self-assembled in one quick step by the SHS metallurgical process, in-situ synthesis and symbotic eutectic transformation under high degree of undercooling. The experimental results indicated that the Al2O3-ZrO2 ceramic eutectic composites with ZrO2 fibers at the nano-submicron scale are only suitable for the ceramic composite with hypoeutectic composition under the conditions of the experiment.
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Liu, Bing Qiang, Chuan Zhen Huang, Han Lian Liu, and Xue Wen Chong. "Development of Whisker Toughening Ceramic Cutting Tool Composite by In Situ Synthesis Technology." Key Engineering Materials 431-432 (March 2010): 201–4. http://dx.doi.org/10.4028/www.scientific.net/kem.431-432.201.

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While whisker toughening ceramic cutting tool composites have excellent mechanical properties at either room or high temperature, the development of them is often limited by some difficulties in the fabrication and application. Here a TiC whisker toughening Al2O3 ceramic cutting tool composite is developed by in situ synthesis technology. Experimental results show the flexure strength, fracture toughness and Vickers hardness of the composite can achieve to 855.7MPa, 7.63 MPa•m1/2 and 19.5GPa, respectively. Being different to that of conventional whisker toughening ceramic composites, the toughness of the composite is dominated by the chemical interface bonding between TiC and Al2O3, which increases with increasing sintering temperature, and the sliding resistance is suggested to be due to the physical absorption and mechanical meshing between the two debonded surfaces.
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Ramírez, Cristina, Pilar Miranzo, Maria Isabel Osendi, and Manuel Belmonte. "In Situ Graded Ceramic/Reduced Graphene Oxide Composites Manufactured by Spark Plasma Sintering." Ceramics 4, no. 1 (December 29, 2020): 12–19. http://dx.doi.org/10.3390/ceramics4010002.

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The present work merges two key strategies for the manufacturing of advanced ceramics, in particular, the development of functionally graded materials (FGMs) and the addition of graphene-based fillers into a ceramic matrix. A silicon nitride/reduced graphene oxide FGM composite is produced, in one step, from a single powder composition using the spark plasma sintering (SPS) technique with an asymmetric setting of the punches and die to create a continuous temperature gradient along the cross section of the powder compact. A deep microstructural and mechanical characterization has been done across the specimen thickness. The FGM composite exhibits bottom-top gradients in both the matrix grain size (150% increase) and α-phase content (89→1%). The FGM bottom surface is 10% harder than the top one and, on the other hand, the latter is 15% tougher. The presence of reduced graphene oxide sheets homogeneously distributed within the ceramic composite reduces the mechanical gradients compared to the monolithic silicon nitride FGM, although allows reaching a maximum long-crack toughness value of 9.4 MPa·m1/2. In addition, these graphene-based fillers turn the insulating ceramics into an electrical conductor material.
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Liao, Zhongquan, Yvonne Standke, Jürgen Gluch, Katalin Balázsi, Onkar Pathak, Sören Höhn, Mathias Herrmann, et al. "Microstructure and Fracture Mechanism Investigation of Porous Silicon Nitride–Zirconia–Graphene Composite Using Multi-Scale and In-Situ Microscopy." Nanomaterials 11, no. 2 (January 22, 2021): 285. http://dx.doi.org/10.3390/nano11020285.

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Silicon nitride–zirconia–graphene composites with high graphene content (5 wt.% and 30 wt.%) were sintered by gas pressure sintering (GPS). The effect of the multilayer graphene (MLG) content on microstructure and fracture mechanism is investigated by multi-scale and in-situ microscopy. Multi-scale microscopy confirms that the phases disperse evenly in the microstructure without obvious agglomeration. The MLG flakes well dispersed between ceramic matrix grains slow down the phase transformation from α to β-Si3N4, subsequent needle-like growth of β-Si3N4 rods and the densification due to the reduction in sintering additives particularly in the case with 30 wt.% MLG. The size distribution of Si3N4 phase shifts towards a larger size range with the increase in graphene content from 5 to 30 wt.%, while a higher graphene content (30 wt.%) hinders the growth of the ZrO2 phase. The composite with 30 wt.% MLG has a porosity of 47%, the one with 5 wt.% exhibits a porosity of approximately 30%. Both Si3N4/MLG composites show potential resistance to contact or indentation damage. Crack initiation and propagation, densification of the porous microstructure, and shift of ceramic phases are observed using in-situ transmission electron microscopy. The crack propagates through the ceramic/MLG interface and through both the ceramic and the non-ceramic components in the composite with low graphene content. However, the crack prefers to bypass ceramic phases in the composite with 30 wt.% MLG.
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Wang, Ying Chun, Jian Guo Li, and Yaohe Zhou. "Research on the In Situ Fabrication of Bioceramic Composite Coatings by Laser Cladding." Key Engineering Materials 330-332 (February 2007): 625–28. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.625.

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Hydroxyapatite(HAP) has excellent osteoconductive properties. By controlling the Ca/P ratio better biphasic calcium phosphate ceramics can be produced than pure HAP ceramics. β- calcium pyrophosphate(β-Ca2P2O7) is a new biodegradable ceramic material and its biological response is quite similar to HAP. Obtaining HAP and other bioactive calcium phosphate ceramic coatings has been a popular research field in the past. In our research a new bioceramic composite coating was obtained by laser cladding with pre-depositing mixed powders of CaHPO4·2H2O and CaCO3 directly on the metal substrate. Its main constituents are HAP and β-Ca2P2O7. The microstructure of the coating consists of minute granular HAP that is distributed among the overlapped club-shaped or needle-like β-Ca2P2O7. The hardness distribution in the cladding layer is even and its value is much higher than that in the substrate. There is a bonded structure of the epitaxial planar growth between the substrate and cladding layer, and both a typical cellular microstructure in the middle and an equiaxed microstructure at the top of the cladding layer.
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Riedel, Ralf. "Novel Method Produces Dense In Situ Ceramic Composite." Materials and Processing Report 3, no. 9 (December 1988): 2–3. http://dx.doi.org/10.1080/08871949.1988.11752214.

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Ehrenfried, Lisa M., David Farrar, David Morsley, and Ruth Cameron. "Mechanical Behaviour of Interpenetrating Co-Continuous β-TCP-PDLLA Composites." Key Engineering Materials 361-363 (November 2007): 407–10. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.407.

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Co-continuous degradable polymer-ceramic composites were produced via in-situ polymerization of (D,L-lactic)acid monomer within a porous β-tricalcium phosphate matrix. The mechanical properties of both the composite and the unfilled porous ceramic were investigated with compressive testing. The average stress to failure increased from 1.3±0.1 MPa for the unfilled ceramic matrix to 82±2 MPa for the composite. The Young’s modulus increased from approximately 20 MPa to 700±42 MPa. A combination of X-ray micro-tomography and mechanical testing provided insight into the failure mechanisms of the composite. Stress may be deflected by crack bridging around the polymer phase leading to debonding of the polymer along the crack lines.
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Huang, Kai Jin. "Synthesis of Al2O3/AlB12/Al Composite Ceramic Powders by Pulsed Nd:YAG Laser Igniting Method and a Study of their Mechanical Properties." Applied Mechanics and Materials 26-28 (June 2010): 919–24. http://dx.doi.org/10.4028/www.scientific.net/amm.26-28.919.

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Based on the combined toughening principle, pure Al2O3/AlB12/Al composite ceramic powders have been synthesized using pulsed Nd:YAG laser igniting method. This method starts from Al and B2O3 powder mixtures, after which Al2O3/AlB12/AlN composite ceramics were fabricated by hot-press sintering at 1600°C for 2h under the protection of a N2 atmosphere. XRD and SEM techniques were used to characterize the phases and morphologies of the powders and the ceramics. The bending strength and the fracture toughness of the ceramics were measured by the three-point bending method and the indentation fracture method, respectively. The results show that the pure Al2O3/AlB12/Al composite ceramic powders can be successfully synthesized by pulsed Nd:YAG laser igniting method because the adiabatic temperature of Al-B2O3 system is more than 1800K. Al2O3 and AlB12 phases were formed by the liquid-liquid reaction mechanism and the liquid-solid reaction mechanism, respectively. The bending strength and the fracture toughness of the Al2O3/AlB12/AlN composite ceramics were 525.86MPa and 5.68MPa.m1/2, respectively. These values are 50.25% and 42% greater than those of the pure Al2O3 ceramic (350MPa and 4MPa.m1/2) due to the reinforcing and toughening in-situ formation of small AlN particles.
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Huang, Kai Jin, Li Yan, Hua Min Kou, and Chang Sheng Xie. "Synthesis of Al2O3/AlB12/Al Composite Ceramic Powders by a New Laser-Induction Complex Heating Method and a Study of their Mechanical Properties." Applied Mechanics and Materials 29-32 (August 2010): 596–601. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.596.

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Based on the combined toughening principle, pure Al2O3/AlB12/Al composite ceramic powders have been synthesized using a new laser-induction complex heating method. This method starts from Al and B2O3 powder mixtures, after which Al2O3/AlB12/AlN composite ceramics were fabricated by hot-press sintering at 1600°C for 2h under the protection of a N2 atmosphere. XRD and SEM techniques were used to characterize the phases and morphologies of the powders and the ceramics. The bending strength and the fracture toughness of the ceramics were measured by the three-point bending method and the indentation fracture method, respectively. The results show that the pure Al2O3/AlB12/Al composite ceramic powders can be successfully synthesized by this new laser-induction complex heating method because the adiabatic temperature of Al-B2O3 system is more than 1800K. Al2O3 and AlB12 phases were formed by the liquid-liquid reaction mechanism and the liquid-solid reaction mechanism, respectively. The bending strength and the fracture toughness of the Al2O3/AlB12/AlN composite ceramics were 551.44MPa and 6.04MPa.m1/2, respectively. These values are 57.55% and 51% greater than those of the pure Al2O3 ceramic (350MPa and 4MPa.m1/2) due to the reinforcing and toughening in-situ formation of small AlN particles.
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Dissertations / Theses on the topic "In situ ceramic composite"

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Mariappan, L. "In-Situ Synthesis Of A12O3_ZrO2_SiCw Ceramic Matrix Composites By Carbothermal Reduction Of Natural Silicates." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/215.

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This thesis outlines the work done on in-situ synthesis of Al2O3-ZrO2-SiCw ceramic composites and their property evaluation. The introductory chapter deals with the literature survey on ceramic matrix composites, properties desirable for structural applications and toughening mechanisms associated with these composites. The role of whisker toughening in ceramic matrix composites, the growth mechanisms involved in whisker growth and the conditions that favour or hamper the whisker growth are also discussed. The advantages and disadvantages of in-situ synthesis of composites as compared to physical mixing are also dealt with. The objective and scope of the work undertaken are outlined at the end. The second chapter describes the experimental techniques associated with carbothermal synthesis and characterisation of reaction products as well as properties of hot pressed bulk composites. The equipments used for this work are described here. The third chapter focuses on the results obtained by the carbothermal reduction of mixtures of kaolin, sillimanite and zircon taken in various proportions. The formation of the product phases with respect to variations in temperature, variations in composition and effect of catalyst is analysed with the help of XRD while their morphology is analysed using SEM. The conditions favouring the formation of tetragonal zirconia without the addition of stabilizers is also enumerated here. The fourth chapter deals with the compaction of these composite powders and the evaluation of some physical, thermal and mechanical properties. Density and porosity, coefficient of thermal expansion, modulus of rupture and fracture toughness of the composite specimens are evaluated and compared with binary and ternary composites made by other methods. Finally the thesis concludes by summarizing the work done and briefly projecting the areas for future work.
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Aramide, FO, KK Alaneme, PA Olubambi, and JO Borode. "In-Situ Synthesis of Mullite Fibers Reinforced Zircon-Zirconia Refractory Ceramic Composite from Clay Based Materials." International Journal of Materials and Chemistry, 2015. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001844.

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Abstract Understanding the phase transformations/developments that result due to varying the production parameter of engineering materials is vital to development of new materials. The effects of yttria and niobium oxide on the phase changes and mechanical properties of mullite fiber reinforced zircon-zirconia ceramic composites produced by in-situ sintering of raw materials was investigated. Varied amounts of powder zirconia, yttria and niobium oxide were mixed in a turbula mixer with a fixed composition of clay (70% volume) of known mineralogical composition and mechanically milled in a planetary ball mill. The blended powders/clay were compacted into standard sample dimensions, and finally fired at 1400°C and held at varied time of one, two and three hours. The fired samples were characterized using ultra-high resolution field emission scanning electron microscope (UHR-FEGSEM) equipped with energy dispersive spectroscopy (EDX), and X-ray diffractometry (XRD). Various mechanical properties of the sintered samples were also investigated. It was observed that the investigated mechanical properties (with the exception of shrinkages) improved with the amount of raw zirconia initially used in the samples. It was also observed that addition of niobium oxide favours the formation polymignite phase, while the presence of both yttria and niobium oxide in the raw materials resulted in the formation of fergusonite phase in the samples. Both additives favour the phase transformation of zirconia from monoclinic to tetragonal and cubic phases even at temperature as low as 1400°C. It was concluded that the improved mechanical properties of the samples was due to strengthening by both mullite fibers reinforcement and phase transformation strengthening.
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Rabih, Ali. "Élaboration et caractérisation de nanocomposites alumine - zircone à partir de poudres cosynthetisées par voie hydrothermale." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/337cf2fd-5f79-4072-932a-6fe51f860b1a.

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La synthèse hydrothermale a permis de synthétiser des poudres nanométriques de zircone stabilisée à l'oxyde d'yttrium, d'alumine (boehmite) et d'alumine-zircone. La caractérisation physique (diffraction des rayons x, densité, surface spécifique, analyse thermique différentielle, microscopie électronique. . . ) de ces poudres obtenues pour plusieurs températures de traitement hydrothermal a été réalisée. Les paramètres de cogélification des précurseurs de nitrates de zirconyle et d'aluminium par de la potasse ont été optimisés pour obtenir des poudres composites homogènes a l'échelle micronique. La taille de la poudre de zircone varie entre 13 et 25 nanomètres. La boehmite et l'alumine gamma présentent la même répartition granulométrique comprise entre 30 et 70 nanomètres. Le frittage naturel de ces poudres composites est devenu possible grâce à l'ensemencement du gel par de l'alumine alpha fine. Le comportement au frittage sous charge, la caractérisation des propriétés mécaniques (résistance à la flexion, facteur critique d'intensité de contrainte et dureté) et des microstructures ont été étudiés. Les microstructures obtenues sont nanométriques et présentent une répartition homogène entre les deux phases. La zircone présente est sous forme quadratique non transformable les nanocomposites étudiés à 5 et 50 % en volume de zircone présentent des valeurs de facteur critique d'intensité de contrainte améliorées par rapport à l'alumine pure. La résistance à la flexion pour la composition à 5 % de zircone est comparable par rapport à une alumine fine. Par contre nous observons une diminution de cette résistance à la flexion pour le nanocomposite à 50 % de zircone en raison d'un ensemencement insuffisant. Un essai de thermocompression a permis de réaliser des jonctions parfaites sans aucune aspérité et avec une excellente continuité au niveau des interfaces de nos nanocomposites alumine-zircone, ce qui laisse a priori suggérer un bon comportement superplastique.
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Guel, Nicolas. "Comportement mécanique de composites oxydes : Relations procédé-microstructure-propriétés." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI104/document.

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Cette thèse a pour objectif la compréhension fine du rôle de la microstructure sur les propriétés mécaniques de composites à matrice céramique oxydes, en vue de l’introduction de ce type de matériau dans les futurs moteurs d’aviation civile. L’influence des hétérogénéités induites par la mise en forme de ce matériau est particulièrement investiguée. Ces hétérogénéités semblent favoriser l’apparition et la propagation de mécanismes d’endommagement conduisant à la ruine du matériau. L’étude est réalisée sur trois nuances de composites oxydes à tissage bidimensionnel générées à partir de trois procédés de fabrication différents. Ces procédés conduisent à la mise en place de trois types de microstructures. Des caractérisations morphologiques par porosimétrie et par μ-tomographie sont réalisées afin d’estimer la répartition des hétérogénéités et ainsi d’établir les microstructures représentatives de chaque nuance. En se basant sur ces analyses, une étude du comportement mécanique des nuances d’étude est réalisée à plusieurs échelles. Dans un premier temps, une étude des propriétés mécaniques à l’échelle macroscopique, représentative du matériau est effectuée à l’aide d’essais de traction dans le plan de tissage. En parallèle, des essais in-situ sont mis en place afin d’observer l’évolution de l’endommagement des microstructures. Ces observations permettent d’améliorer la compréhension du rôle des hétérogénéités sur l’activation des mécanismes d’endommagement. Le suivi de l’EA (Emission Acoustique) des essais est utilisé pour analyser la cinétique d’endommagement des nuances de composites oxydes. En plus de l’analyse globale de l’activité acoustique, des classifications des signaux d’EA sont réalisées. Ces classifications se basent sur la détection de signaux d’EA à l’aide de deux types de capteurs présentant des caractéristiques différentes. Une labellisation des classes est proposée en confrontant les activités de ces classes aux mécanismes d’endommagement observés lors des essais in-situ. Le couplage de l’ensemble de ces informations permet de constituer le scénario d’endommagement de chaque nuance. Il est ainsi possible d’établir le rôle de chaque type d’hétérogénéités sur le comportement mécanique des composites oxydes
The aim of this thesis is the fine understanding on the influence of the microstructure on oxide-based ceramic matrix composites mechanical properties. These materials are good candidate for new generation of civil aircraft engines. The aim of this work is to establish a relationship between the microstructural defects generated by the manufacturing process and the mechanical behavior of the composite. These heterogeneities seem to influence the appearance and the propagation of damage mechanisms. This study is realized on three kinds of bi-dimensional oxide composites generated from three different manufacturing processes. These processes create three kinds of microstructure. Porosimetric and μ-tomographic analyses allow estimating the distribution of microstructural defects and establish typical microstructure of each oxide composite. Based on these preliminary analyses, mechanical behavior of each kind of oxide composites is studied through several representative scales. On the one hand, mechanical tensile tests are carried out in order to estimate the mechanical properties of the studied materials in the weaving plane. On the other hand, the implementation of in-situ mechanical tests allows the visualization of damage mechanisms appearance and propagation. These observations improve the understanding of the role of microstructural defects on the activation of damage mechanisms. Damage kinetics of each mechanical test are inspected through AE (Acoustic emission) analysis. This monitoring helps to link mechanical behavior with microstructural damage. In parallel with global AE analysis, AE clustering is achieved. These classifications are based on two kinds of AE sensor with different properties. Data fusion from the two sensors is accomplished. This technique allows more robust AE clustering. Cluster labelling is proposed thanks to damage mechanisms observed during in-situ mechanical tests. Damage scenarios are set up owing to macroscopic mechanical test, in-situ analysis and AE labelling. Thus, it is possible to establish the influence of each kind of microstructural defect on oxide-based CMCs mechanical behavior
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Liu, JingJing. "Carbon nanotubes developed on ceramic constituents through chemical vapour deposition." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/9967.

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Carbon nanotubes (CNTs) were successfully grown on the surface of carbon fibre reinforcements in carbon fibre architecture through in-situ catalytic chemical vapour deposition (CCVD). Success was also implemented on powders of oxides and non-oxides, including Y-TZP powder, ball milled alumina powder, alumina grits, silicon carbide powder. Preliminary results have been achieved to demonstrate the feasibility of making ceramic composites consisting of CNTs reinforcements.
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O'Sullivan, David. "Élaboration et caractérisation mécanique des nanocomposites alumine-carbure de silicium." Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/fa8074c9-3bc2-47e1-a75e-41fa9c276467.

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L'objectif de cette étude était de développer un protocole de fabrication de nanocomposites à matrice d'alumine renforcée par des particules nanométriques (< 200 nm) de carbure de silicium utilisant des poudres commerciales et l'eau comme milieu de dispersion, ceci dans un but de faisabilité industrielle. Après la détermination des meilleures conditions de dispersion des poudres d'alumine et de carbure de silicium choisies, les mélanges ont été densifies par pressage à chaud afin d'obtenir des matériaux complètement denses. Malgré la température de frittage plus élevée utilisée pour les nanocomposites (1550°C au lieu de 1400°C), la taille moyenne des grains d'alumine se situant entre 0. 6 et 1. 5 µm est équivalente ou inférieure à celle des grains du matériau monolithique. L'étude des propriétés mécaniques a température ambiante de nanocomposites contenant entre 2. 5 et 25% en volume de SiC a permis de déterminer l'influence de la teneur en dispersoïdes à savoir une augmentation de la résistance en flexion (une valeur de 1 GPA a été obtenue pour le nanocomposite contentant 7. 5% en volume de SiC), une amélioration assez modeste de la ténacité, une légère diminution du module de Young ainsi qu'une faible augmentation de la dureté. L’étude comparative de la résistance au fluage de l'alumine et d'un nanocomposite contenant 5% en volume de SiC a montré que la vitesse de déformation du nanocomposite est 100 fois plus faible que celle de l'alumine pure. Un modèle de blocage du glissement aux joints de grains par les particules de SiC est proposé.
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Poorteman, Marc. "Fabrication et caractérisation de composites céramiques renforcés par des plaquettes." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/078152fe-6c38-4759-a136-3513bbe27089.

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Dans le cadre de ce travail, nous avons fabriqué des composites céramiques renforcés par des plaquettes céramiques par des techniques classiques de dispersion et de mise en forme et par frittage sous pression. Ces techniques ont permis d'obtenir des matériaux denses avec une dispersion homogène des plaquettes et une microstructure des grains constituant la matrice comparable dans le cas du matériau monolithique et du composite. Un choix judicieux des couples matrice-plaquettes a permis d'étudier l'influence des contraintes générées lors de la descente en température du frittage suite à la différence de coefficient de dilatation entre la matrice et les plaquettes et de la nature de l'interface sur les propriétés mécaniques du composite. Pour chacun des systèmes étudiés, les mécanismes de renforcement à température ambiante se sont avérés multiples. La contribution de chacun de ces mécanismes au renforcement est fonction des contraintes résiduelles et de la nature de l'interface. Cependant dans tous les cas les plaquettes constituent le défaut critique. L'évolution des mécanismes de renforcement avec la température peut être déterminée par les contraintes présentes à haute température (cas du système ZrO2-SiC), mais également par la présence d'une phase liquide à haute température (cas des systèmes Si3N4-SiC et ZrO2-Al2O3). Nous avons également démontré dans le cas du système Si3N4-SiC que le composite présente une meilleure résistance à la propagation sous-critique à haute température par rapport au matériau monolithique et, dans le cas du système ZrO2-Al2O3, que le composite, comme le matériau monolithique, est superplastique
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Sapardanis, Hélène. "Fissuration à l’interface d’un revêtement plasma céramique et d’un substrat métallique sous sollicitations dynamique et quasi-statique multiaxiales." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM033/document.

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Les travaux présentés dans ce manuscrit visent à étudier la propagation d'un défaut interfacial de géométrie connue soumis à un cisaillement macroscopique à partir d'une méthodologie expérimentale développée durant la thèse qui consiste à i) élaborer un système revêtu céramique/métal dont la morphologie d'interface est contrôlée, ii) introduire un défaut d'interface par la technique de choc laser, iii) soumettre le système revêtu pré-fissuré à un cisaillement macroscopique grâce à une machine de fatigue biaxiale coplanaire et iv) mesurer in situ l'évolution de ce défaut. Le système revêtu subit donc une sollicitation dynamique par la technique de choc laser et quasi-statique par les essais biaxiaux. La morphologie d'interface, paramètre influant sur la fissuration, est également étudiée. Un dépôt d'alumine pure est directement projeté par plasma sur un substrat métallique, un superalliage base cobalt Haynes 188 et un acier inoxydable 304L, sans sous-couche.Un premier travail d'analyse du défaut introduit par choc laser en fonction des paramètres laser et de la morphologie d'interface a tout d'abord été réalisé. Le défaut d'interface résultant se caractérise par une zone délaminée circulaire de quelques millimètres de diamètre et d'une cloque formée par la couche de céramique de quelques dizaines de micromètres de hauteur. Ces dimensions caractéristiques ont été mesurées à partir de techniques d'observation non destructives : profilométrie 3D, observation optique et thermographie infrarouge. La fissuration par choc laser a été étudiée par éléments finis grâce à un modèle de type contact cohésif pour l'interface.La propagation du défaut soumis à un cisaillement macroscopique a été caractérisée expérimentalement grâce aux observations optiques et à la technique de stéréo-corrélation d'images. L'analyse par élément finis du problème a permis d'accéder aux modes de sollicitation le long du front de fissure et de donner une première explication quant aux formes délaminées obtenues expérimentalement. Cette analyse s'appuie sur un modèle de zone cohésive dont les conditions aux limites imposées sont déterminées à l'aide des mesures de déplacement obtenues par corrélation d'images. En particulier, il a été mis en évidence que l’ouverture du front de fissure (mode I), induit par le flambage de la couche et par le chargement macroscopique, favorise la propagation du délaminage qui reste pilotée essentiellement par le cisaillement local (mode II et III). L'influence du cisaillement macroscopique dans le plan de la couche déposée sur la propagation du délaminage interfacial a ensuite été étudiée à partir de trois cas de chargement. Une analyse par éléments finis basée sur la mécanique linéaire de la rupture dans un matériau homogène a permis de déterminer l'influence du cisaillement macroscopique sur le chargement local le long du front de fissure
The work presented in this manuscript aims to investigate the growth of an interfacial flaw, whose geometry is known, under macroscopic shear loading. An experimental methodology is thus developed in which i) a ceramic/metal coated system with controlled interface roughness is processed, ii) an interfacial flaw is introduced using the laser shock technique, iii) a macroscopic shear loading is applied on the coated system using a biaxial in-plane testing device and iv) interfacial crack growth and buckling are measured in situ. Hence, both dynamic and quasi-static loadings are applied on the coated system by respectively the laser shock technique and biaxial testing. The interface roughness, which affects the crack growth, is also considered in the study. A pure alumina coating is deposited by air plasma spraying on a metallic substrate, polycrystalline cobalt base superalloy Haynes 188 and stainless steel 304L substrates, with no bond coat.First, the flaw resulting from the propagation of a laser shock wave has been analyzed according to the laser parameters and the interface roughness. An interfacial flaw is characterized by a circular delamination with a diameter of a few millimeters and a circular blister with a height of a few tens of micrometers. These characteristic dimensions have been measured thanks to non destructive techniques: 3D profilometry and image analysis based on optical observations and infrared thermography. A finite element analysis has been carried out to investigate the crack behavior under laser shock wave propagation using a cohesive contact to account for the interface behavior.The interfacial flaw growth under macroscopic shear loading has been characterized with optical observations and the digital image stereo-correlation technique. The related finite element analysis enabled to identify the local loading along the crack front and gave a first explanation about the shapes of the delaminated area observed experimentally. This analysis relies on a cohesive zone model whose applied boundary conditions are established from the displacements measured by digital image correlation technique. By this way, the delamination growth was revealed to be mostly driven by local shear (mode II and III) and the crack opening (mode I), induced by the buckling of the deposited layer and the macroscopic shear, makes the delamination growth easier. Finally, the influence of the macroscopic shear loading on the interfacial delamination has been studied from three different macroscopic shear loadings. The finite element analysis based on linear elastic fracture mechanics in a homogenous material has allowed to study the influence of the macroscopic shear loading on the local loading along the crack front
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Hassanin, Hany Salama Sayed Ali. "Fabrication of ceramic and ceramic composite microcomponents using soft lithography." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1538/.

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This PhD project is set out to develop a high precision ceramic fabrication approach suitable for mass production, and to meet the needs of microengine application. A group of new processes have been developed and the results are characterized for fabrication of high precision ceramic oxides and composite microcomponents using soft lithography and colloidal powder processing. The materials chosen in the research are alumina, yttria stabilised zirconia and their composite for their excellent properties at high temperature.
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McDermott, A. "In-situ coagulation moulding of ceramic suspensions." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287181.

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Books on the topic "In situ ceramic composite"

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National Workshop on Metal, Ceramic and Composite Powders (5th : 1989 : Bombay, India). Metal, ceramic and composite powders. Edited by Ramakrishnan P and Indian Institute of Technology, Bombay. New Delhi: Oxford & IBH, 1990.

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Hull, David R. Plasma etching a ceramic composite. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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R, Warren, ed. Ceramic-matrix composites. London: Blackie, 1992.

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Corrosion of Ceramic and Composite Materials. 2nd ed. Abingdon: CRC Press [Imprint], 2004.

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McCauley, Ronald A. Corrosion of ceramic and composite materials. 2nd ed. New York: Marcel Dekker Inc., 2004.

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McClure, Amy Evans. Amy Evans McClure: In space in situ. Oakland, CA: O Books, 2009.

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Ceramic matrix composites. 2nd ed. Boston: Kluwer Academic, 2003.

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Ceramic matrix composites. London: Chapman & Hall, 1993.

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I, Trefilov V., ed. Ceramic- and carbon-matrix composites. London: Chapman & Hall, 1995.

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R, Shan Ashwin, and Lewis Research Center, eds. Probabilistic modeling of ceramic matrix composite strength. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Book chapters on the topic "In situ ceramic composite"

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Pei, Bingbing, Yunzhou Zhu, and Zhengren Huang. "Temperature Effect on C/SiC Composite with SiC Nanowires Grown in Situ." In Ceramic Transactions Series, 403–7. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118932995.ch43.

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Chen, Zhong-Chun, Toshihiko Okazawa, and Keisuke Ikeda. "In-Situ Synthesis of Oxide/Oxide Composites." In Ceramic Transactions Series, 11–21. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144091.ch2.

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Fernandez, Claudia P., Ruth H. G. A. Kiminami, Fabio Luiz Zabotto, and Ducinei Garcia. "Microstructure and Magnetoelectric Properties of Microwave Sintered CoFe2O4-PZT Particulate Composite Synthesized in Situ." In Ceramic Transactions Series, 279–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118995433.ch27.

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Zhang, G. J., T. Ohji, S. Kanzaki, and J. F. Yang. "In Situ Synthesis of Nonoxide-Boron Nitride (Nobn) Composites." In Ceramic Transactions Series, 83–91. 735 Ceramic Place, Westerville, Ohio 43081: The American Ceramic Society, 2012. http://dx.doi.org/10.1002/9781118370872.ch7.

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Zhang, G. J., T. Ohji, S. Kanzaki, and J. F. Yang. "Characterization of in situ Nonoxide-Boron Nitride (Nobn) Composites." In Ceramic Transactions Series, 115–23. 735 Ceramic Place, Westerville, Ohio 43081: The American Ceramic Society, 2012. http://dx.doi.org/10.1002/9781118380925.ch9.

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Dassios, K., C. Galiotis, V. Kostopoulos, and M. Steen. "In Situ Assessment of the Micromechanics of Large Scale Bridging in Ceramic Composites." In Recent Advances in Composite Materials, 71–79. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2852-2_7.

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Gu, Wei, Jian Yang, and Tai Qiu. "In-Situ Synthesys and Properties of TiB2 /Ti3 SiC2 Composites." In Ceramic Transactions Series, 429–35. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470640845.ch62.

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Satapathy, L. N., P. D. Ramesh, Dinesh Agrawal, and Rustum Roy. "In-Situ Synthesis and Characterization of SiC - Al2 O3 Composites." In Ceramic Transactions Series, 135–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118408391.ch13.

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Shuquan, Liang, Zhong Jie, Zhang Guowei, and Tan Xiaoping. "Nano-Zirconia/Mullite Composite Ceramics Prepared by In-Situ Controlled Crystallization from the Si-Al-Zr-O Amorphous Bulk." In Ceramic Transactions Series, 99–108. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470640845.ch14.

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Paderno, Yu B. "A New Class of “In-Situ” Fiber Reinforced Boride Composite Ceramic Materials." In Advanced Multilayered and Fibre-Reinforced Composites, 353–69. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-007-0868-6_23.

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Conference papers on the topic "In situ ceramic composite"

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Kim, Ran Y., and G. P. Tandon. "In Situ Observation and Modeling of Damage Modes in Cross-Ply Ceramic Matrix Composites." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0699.

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Abstract Ceramic-matrix composites generally exhibit matrix and/or interface damage well before final failure because of the low strain capability of the brittle matrix and weak interfacial bonding. These damages have a significant influence on the stress-strain behavior as well as on the ultimate strength of the composite. The failure process in a multidirectional laminate is further complicated by its dependence on ply orientations and stacking sequence Reported in this paper are the results of both analytical and experimental investigations carried out in an attempt to understand the initiation and propagation of damage in a [0/90]3S cross-ply laminate. A glass-ceramic matrix composite reinforced with silicon carbide (Nicalon) fibers is investigated at room temperature under uniaxial tensile loading. The initiation and propagation of interfacial debonding, microcracking, and fiber breaks were observed in situ, under applied load using a specially built loading device. The observed damage modes were then incorporated into existing micromechanical models to predict the laminate stress-strain behavior and compared with the experimental measurements.
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Baskey, H. B., Devendra Kumar, T. C. Shami, R. Kumar, S. Kumar, A. K. Dixit, and N. Eswara Prasad. "In-situ high-temperature electromagnetic characterization of ceramic composite tiles for strategic applications." In 2016 11th International Conference on Industrial and Information Systems (ICIIS). IEEE, 2016. http://dx.doi.org/10.1109/iciinfs.2016.8262955.

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Ulianitsky, V. Yu, D. V. Dudina, I. S. Batraev, N. V. Bulina, A. I. Kovalenko, M. A. Korchagin, and B. B. Bokhonov. "In situ formation of metal-ceramic composite coatings by detonation spraying of titanium." In INTERNATIONAL CONFERENCE ON PHYSICAL MESOMECHANICS OF MULTILEVEL SYSTEMS 2014. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4899028.

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Singh, Yogesh P., Michael J. Presby, Kannan Manigandan, and Gregory N. Morscher. "Multi-Lead Direct Current Potential Drop (DCPD) for In-Situ Health Monitoring of Ceramic Matrix Composites." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75803.

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The method of direct current potential drop (DCPD) can be utilized as an effective, and convenient approach for in-situ damage detection, and as a non-destructive evaluation technique. We present the results from use of a multiprobe DCPD technique for in-situ damage detection in loading of a SiC/SiC composite. It is shown that in three different modes of loading (monotonic, fatigue, and cyclic load-unload), the sensing capabilities of DCPD technique compares well to the techniques of modal acoustic emission (AE) and digital image correlation (DIC). It was also found that DCPD technique provides a far earlier warning of failure under fatigue loading than the other two methods. In addition, we show that strategically placed multiple voltage leads on the specimen surface provides a promising way of qualitatively determining the crack initiation site. Therefore, the use of multiple lead DCPD method, together with other techniques, provides a viable option for sensing damage in ceramic matrix composites (CMCs) with complex geometries, and for applications at higher temperatures.
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Hernandez, Johnathan, Quentin Fouliard, Caroline Anderson, Matthew Northam, Khanh Vo, Jared Clabaugh, Douglas Wolfe, et al. "In-Situ XRD Characterization of Interface Strains In Multilayered Ceramic Composite Systems for Hypersonics Applications." In 23rd AIAA International Space Planes and Hypersonic Systems and Technologies Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2421.

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Giurgiutiu, Victor, and Bin Lin. "In-Situ Fabrication of Composite Piezoelectric Wafer Active Sensors for Structural Health Monitoring." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60929.

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Structural health monitoring (SHM) is important for reducing maintenance costs while increasing safety and reliability. Traditionally, structural integrity tests required attachment of sensors to the material surface. This is often a burdensome and time-consuming task, especially considering the size and magnitude of the surfaces measured (such as aircraft, bridges, structural supports, etc.). Temporary sensors are a hassle to install; there are some critical applications where they simply cannot accomplish the task required. Piezoelectric wafer active sensors (PWAS) can be permanently attached to the structure and offer a permanent sensor solution. Existing ceramic PWAS, while fairly accurate when attached correctly to the substance, may not provide the long term durability required for SHM. The bonded interface between the PWAS and the structure is often the durability weak link. Better durability may be obtained from a built-in sensor that is incorporated into the material. This paper describes the work on the in-situ fabrication of PWAS using a piezoelectric composite approach. The piezoelectric composite was prepared by mixing small lead zirconate titanate (PZT) particles in an epoxy resin matrix; the mixture was then directly applied onto the surface of a host structure using a designed mask. The curing of the piezo composite was carried out at elevated temperature. After curing, the cured composite was sanded down to the desired thickness. Finally, the piezo composite was poled under a high electric field to activate the piezoelectric effect. The resulting in-situ composite PWAS was utilized as a sensor for dynamic vibration and impact. Characterization of the in-situ composite PWAS on aluminum structure have been recorded and compared with ceramic PWAS before and after polarization. To evaluate the performance of the in-situ composite PWAS, both vibration and impact tests were conducted. In-situ composite PWAS are believed to be a good candidate for reliable low-cost sensor fabrication for SHM.
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Chulya, Abhisak, John P. Gyekenyesi, and Ramakrishna T. Bhatt. "Mechanical Behavior of Fiber Reinforced SiC/RBSN Ceramic Matrix Composites: Theory and Experiment." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-209.

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The mechanical behavior of continuous fiber reinforced SiC/RBSN composites with various fiber contents is evaluated. Both catastrophic and noncatastrophic failures are observed in tensile specimens. Damage and failure mechanisms are identified via in-situ monitoring using NDE techniques throughout the loading history. Effects of fiber/matrix interface debonding (splitting) parallel to the fibers are discussed. Statistical failure behavior of fibers is also observed, especially when the interface is weak. Micromechanical models incorporating residual stresses to calculate the critical matrix cracking strength, ultimate strength and work of pull-out are reviewed and used to predict composite response. For selected test problems, experimental measurements are compared to analytical predictions.
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"Dry Sliding Wear Behaviour of Al-Based Composite Prepared with Novel In-Situ Ceramic Composite Developed from Colliery Waste Using Taguchi Method." In 2nd International Conference on Research in Science, Engineering and Technology. International Institute of Engineers, 2014. http://dx.doi.org/10.15242/iie.e0314549.

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Agrawal, Parul, and C. T. Sun. "Crack Growth in Metal-Ceramic Composites." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2156.

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Abstract This research focuses on the fracture mechanisms in various metal-ceramic composites. The objective was to study the effects of volume fractions, residual stresses and other microstructural features like particle size and contiguity of the constituent phases, on fracture. Neutron diffraction tests were performed to measure residual stresses in these composites. In-situ 3-point bend tests were performed inside the ESEM (Environmental scanning electron microscope) chamber to observe crack growth. It was found that residual stresses and contiguity play dominant roles in fracture and defining the crack path. The correlations between residual stresses and other microstructural features with the crack path and failure mechanisms were established based on experimental observations.
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Szweda, Andy, Steve Butner, John Ruffoni, Carlos Bacalski, Jay Lane, Jay Morrison, Gary Merrill, et al. "Development and Evaluation of Hybrid Oxide/Oxide Ceramic Matrix Composite Combustor Liners." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68496.

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Oxide/Oxide Ceramic Matrix Composites (CMCs) are an attractive class of materials for gas turbine hot section applications. The oxide fiber reinforcement and inherent matrix porosity contributes to favorable fracture toughness and thereby enhanced resistance against impact by foreign objects. Also, the oxide composition ensures superior environmental resistance against accelerated attack by corrosive species in the gas turbine hot section and resulting surface recession typically observed in silicon-based ceramic monolithic and composite materials. Under a program sponsored by the US National Institute of Standards and Technology (NIST) a hybrid oxide/oxide CMC system has been developed with potential application for stationary gas turbine hot section components. COI Ceramics, Inc. has fabricated subscale and full scale combustor liners which have been evaluated in rig and engine testing at Solar, and in field testing in a Solar Centaur® 50S engine at a commercial end user site. Following the conclusion of the NIST program in June 2003 the engine field testing is being continued under a Solar-led program sponsored by the US Dept. of Energy (DOE). As of November 2004, a hybrid oxide/oxide CMC outer combustor liner has accumulated 12,582 field test hours with 63 starts and an extensive material experience base has been developed. The paper will summarize the progress to-date for this hybrid CMC combustor liner development and demonstration, including selected fabrication approach, NDE, and rig/engine test experience.
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Reports on the topic "In situ ceramic composite"

1

Savrun, Ender, and Cetin Toy. High Strength, High Toughness in Situ Ceramic Composites. Fort Belvoir, VA: Defense Technical Information Center, November 1995. http://dx.doi.org/10.21236/ada300976.

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Zhang, XI-Cheng, David Hurley, and Albert Redo-Scanchez. Non Destructive Thermal Analysis and In Situ Investigation of Creep Mechanism of Graphite and Ceramic Composites using Phase-sensitive THz Imaging & Nonlinear Resonant Ultrasonic Spectroscopy. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1056847.

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Sayir, Ali. Directionally Solidified Eutectic Ceramics; In-Situ Composites for High Temperature Structural Applications. Fort Belvoir, VA: Defense Technical Information Center, February 2004. http://dx.doi.org/10.21236/ada421689.

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Case, S. W., H. G. Halverson, R. H. Carter, M. Wone, and K. L. Reifsnider. Properties and Performance of Ceramic Composite Components. Office of Scientific and Technical Information (OSTI), August 1999. http://dx.doi.org/10.2172/9749.

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Judkins, R. R., D. P. Stinton, R. G. Smith, E. M. Fischer, J. H. Eaton, B. L. Weaver, J. L. Kahnke, and D. J. Pysher. Development of ceramic composite hot-gas filters. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/52754.

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Lott, L. A., D. C. Kunerth, and J. B. Walter. Nondestructive evaluation of advanced ceramic composite materials. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/6270236.

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Carter, R. H. Properties and Performance of Ceramic Composite Components. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/773302.

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R. Suplinskas G. DiBona and W. Grant. Continuous Fiber Ceramic Composite (CFCC) Program: Gaseous Nitridation. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/791414.

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Holloran, John W. Composite Ceramic Superconducting Wires for Electric Motor Applications. Fort Belvoir, VA: Defense Technical Information Center, July 1989. http://dx.doi.org/10.21236/ada210345.

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Parish, Mark V. Composite Ceramic Superconducting Wires for Electric Motor Applications. Fort Belvoir, VA: Defense Technical Information Center, December 1990. http://dx.doi.org/10.21236/ada232074.

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