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Letteratura scientifica selezionata sul tema "Non oxyde ceramic"

Autore: Grafiati

Pubblicato: 15 febbraio 2025

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Articoli di riviste sul tema "Non oxyde ceramic"

Martinelli, Antonio E., Rubens M. Nascimento, Tarcisio E. de Andrade, Augusto J. A. Buschinelli, Jorge C. L. B. S. Pereira, Sonja M. Gross e Uwe Reisgen. "Wetting Oxide and Non-Oxide Ceramics with Active Metals". Materials Science Forum 730-732 (novembre 2012): 164–69. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.164.

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Brazing has been used to join structural ceramics to devices mostly manufactured using metal alloys. Direct brazing employs filler alloys containing an active metal, usually Ti, to wet the ceramic substrate. However, the cost of active filler alloys is usually around 10 times higher than that of active metal-free alloys. In addition, the concentration of the active metal is usually small, thus limiting the formation of a continuous reaction layer onto the entire ceramic surface. Alternatively, ceramic substrates can be previously metallized and fully coated with an active element to be wetted by conventional active metal free filler alloys. Ceramics can be metallized by different techniques, including mechanical metallization. It consists in frictioning an active metal bit, traditionally made of Ti, against the ceramic. Conventional tools can be used and the method is easily automated to large batches. Moreover, contrary to other techniques, mechanical metallization is carried out at room temperature and no hazardous fluxing agents are used. Although Ti is traditionally employed in mechanical metallization, the technique is not limited to it. Indeed, the exclusive use of Ti univocally determines the microstructure of the resulting ceramic/titanium and titanium/filler alloy interfaces. Although the formation of a reaction layer is beneficial to the mechanical strength and reliability of brazed components, precipitation zones and intermetallics embrittle the joints and affect their mechanical behavior. Therefore, the objective of the present study was to assess the potential use of alternative active metals in the mechanical metallization of structural oxide (alumina e zirconia) and non-oxide (silicon carbide and nitride) ceramics. Ceramic substrates were mechanically metallized using Ti, Ta, Nb and Zircaloy 2 (mainly 98.25 % Zr and 1.45% Sn). These metals are abundant in Brazil and therefore strategically important. The wettability of the metallized surfaces was evaluated using three commercially available active metal free filler alloys: VH 780 (Ag-28 Cu), VH 950 (Au – 18 Ni) and SCP 2 (Ag – 31.5 Cu – 10 Pd). The results showed that it was possible to mechanically metallize all ceramic surfaces with the active metals investigated. The wetting tests revealed limited potential for the use of Nb and Ta. On the other hand Zircaloy 2 was successfully employed as active metal for both oxide and non oxide ceramics.

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Gao, Xiong, Jingyi Chen, Xiaotong Chen, Wenqing Wang, Zengchan Li e Rujie He. "How to Improve the Curing Ability during the Vat Photopolymerization 3D Printing of Non-Oxide Ceramics: A Review". Materials 17, n. 11 (29 maggio 2024): 2626. http://dx.doi.org/10.3390/ma17112626.

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Vat photopolymerization (VP), as an additive manufacturing process, has experienced significant growth due to its high manufacturing precision and excellent surface quality. This method enables the fabrication of intricate shapes and structures while mitigating the machining challenges associated with non-oxide ceramics, which are known for their high hardness and brittleness. Consequently, the VP process of non-oxide ceramics has emerged as a focal point in additive manufacturing research areas. However, the absorption, refraction, and reflection of ultraviolet light by non-oxide ceramic particles can impede light penetration, leading to reduced curing thickness and posing challenges to the VP process. To enhance the efficiency and success rate of this process, researchers have explored various aspects, including the parameters of VP equipment, the composition of non-oxide VP slurries, and the surface modification of non-oxide particles. Silicon carbide and silicon nitride are examples of non-oxide ceramic particles that have been successfully employed in VP process. Nonetheless, there remains a lack of systematic induction regarding the curing mechanisms and key influencing factors of the VP process in non-oxide ceramics. This review firstly describes the curing mechanism of the non-oxide ceramic VP process, which contains the chain initiation, chain polymerization, and chain termination processes of the photosensitive resin. After that, the impact of key factors on the curing process, such as the wavelength and power of incident light, particle size, volume fraction of ceramic particles, refractive indices of photosensitive resin and ceramic particles, incident light intensity, critical light intensity, and the reactivity of photosensitive resins, are systematically discussed. Finally, this review discusses future prospects and challenges in the non-oxide ceramic VP process. Its objective is to offer valuable insights and references for further research into non-oxide ceramic VP processes.

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Kusunose, Takafumi, e Tohru Sekino. "Non-Oxide Ceramic Nanocomposites with Multifunctionality". Key Engineering Materials 403 (dicembre 2008): 45–48. http://dx.doi.org/10.4028/www.scientific.net/kem.403.45.

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Two types of Aluminum nitride (AlN) based ceramic nanocomposite with multifunctionality were investigated to improve machinability or electrical conductivity of AlN ceramics with high thermal conductivity. The AlN/BN nanocomposite was fabricated by hot-pressing AlN-BN composite powder, which was prepared by reducing and heating AlN particles containing a mixture of boric acid, urea and carbon. The nanocomposite containing 20 vol.% BN showed high strength, good machinability and relatively high thermal conductivity. On the other hand, the sintered AlN ceramics with CeO2 as an additive indicated high thermal conductivity and electric conductivity which is possible for electric discharge machining.

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Karadimas, George, e Konstantinos Salonitis. "Ceramic Matrix Composites for Aero Engine Applications—A Review". Applied Sciences 13, n. 5 (26 febbraio 2023): 3017. http://dx.doi.org/10.3390/app13053017.

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Ceramic matrix materials have attracted great attention from researchers and industry due to their material properties. When used in engineering systems, and especially in aero-engine applications, they can result in reduced weight, higher temperature capability, and/or reduced cooling needs, each of which increases efficiency. This is where high-temperature ceramics have made considerable progress, and ceramic matrix composites (CMCs) are in the foreground. CMCs are classified into non-oxide and oxide-based ones. Both families have material types that have a high potential for use in high-temperature propulsion applications. The oxide materials discussed will focus on alumina and aluminosilicate/mullite base material families, whereas for non-oxides, carbon, silicon carbide, titanium carbide, and tungsten carbide CMC material families will be discussed and analyzed. Typical oxide-based ones are composed of an oxide fiber and oxide matrix (Ox-Ox). Some of the most common oxide subcategories are alumina, beryllia, ceria, and zirconia ceramics. On the other hand, the largest number of non-oxides are technical ceramics that are classified as inorganic, non-metallic materials. The most well-known non-oxide subcategories are carbides, borides, nitrides, and silicides. These matrix composites are used, for example, in combustion liners of gas turbine engines and exhaust nozzles. Until now, a thorough study on the available oxide and non-oxide-based CMCs for such applications has not been presented. This paper will focus on assessing a literature survey of the available oxide and non-oxide ceramic matrix composite materials in terms of mechanical and thermal properties, as well as the classification and fabrication methods of those CMCs. The available manufacturing and fabrication processes are reviewed and compared. Finally, the paper presents a research and development roadmap for increasing the maturity of these materials allowing for the wider adoption of aero-engine applications.

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Böttcher, Maike, Daisy Nestler, Jonas Stiller e Lothar Kroll. "Injection Moulding of Oxide Ceramic Matrix Composites: Comparing Two Feedstocks". Key Engineering Materials 809 (giugno 2019): 140–47. http://dx.doi.org/10.4028/www.scientific.net/kem.809.140.

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Ceramic materials are suitable for use in the high temperature range. Oxide ceramics, in particular, have a high potential for long-term applications under thermal cycling and oxidising atmosphere. However, monolithic oxide ceramics are unsuitable for use in high-temperature technical applications because of their brittleness. Thin-walled, oxidation resistant, and high-temperature resistant materials can be developed by reinforcing oxide ceramics with ceramic fibres such as alumina fibres. The increase of the mechanical stability of the composites in comparison to the non-fibre reinforced material is of outstanding importance. Possible stresses or cracks can be derived along the fibre under mechanical stress or deformation. Components made of fibre-reinforced ceramic composites with oxide ceramic matrix (OCMC) are currently produced in manual and price-intensive processes for small series. Therefore, the manufacturing should be improved. The ceramic injection moulding (CIM) process is established in the production of monolithic oxide ceramics. This process is characterised by its excellent automation capability. In order to realise large scale production, the CIM-process should be transferred to the production of fibre-reinforced oxide ceramics. The CIM-process enables the production of complicated component shapes and contours without the need for complex mechanical post-treatment. This means that components with complex geometries can be manufactured in large quantities.To investigate the suitability of the injection moulding process for the production of OCMCs, two different feedstocks and alumina fibres (Nextel 610) were compounded in a laboratory-scale compounder. The fibre volume fractions were varied. In a laboratory-scale injection moulding device, microbending specimens were produced from the compounds obtained in this way. To characterise the test specimens, microstructure examinations and mechanical-static tests were done. It is shown that the injection moulding process is suitable for the production of fibre-reinforced oxide ceramics. The investigations show that the feedstocks used have potential for further research work and for future applications as material components for high-temperature applications in oxidising atmospheres.

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Mitomo, Mamoru, e Günter Petzow. "Recent Progress in Silicon Nitride and Silicon Carbide Ceramics". MRS Bulletin 20, n. 2 (febbraio 1995): 19–22. http://dx.doi.org/10.1557/s0883769400049162.

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We know from experience that ceramic materials are brittle and easily broken. This is one reason why ceramics have not been used as engineering materials. Fracture is the result of crack growth through the microstructure. It was Griffith who proposed that ceramics have intrinsic cracks which grow under applied stress. The concentration of the applied stress at the crack tip decreases the strength to a level of about 1% or less of the theoretical strength. If the crack starts to grow, strength decreases so sharply that a catastrophic fracture occurs.In spite of the brittle nature of ceramics, their application as engineering materials was proposed in the 1960s because ceramic materials made of silicon nitride or carbide have higher strength at high temperatures than metals and oxide ceramics. Non-oxide ceramics have lower thermal-expansion-coefficients than oxides, resulting in better thermal shock resistance, which is one of the most important requirements for engineering ceramics.

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Wang, Ruzhuan, Dingyu Li e Weiguo Li. "Temperature dependence of hardness prediction for high-temperature structural ceramics and their composites". Nanotechnology Reviews 10, n. 1 (1 gennaio 2021): 586–95. http://dx.doi.org/10.1515/ntrev-2021-0041.

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Abstract Hardness is one of the important mechanical properties of high-temperature structural ceramics and their composites. In spite of the extensive use of the materials in high-temperature applications, there are few theoretical models for analyzing their temperature-dependent hardness. To fill this gap in the available literature, this work is focused on developing novel theoretical models for the temperature dependence of the hardness of the ceramics and their composites. The proposed model is just expressed in terms of some basic material parameters including Young’s modulus, melting points, and critical damage size corresponding to plastic deformation, which has no fitting parameters, thereby being simple for materials scientists and engineers to use in the material design. The model predictions for the temperature dependence of hardness of some oxide ceramics, non-oxide ceramics, ceramic–ceramic composites, diamond–ceramic composites, and ceramic-based cermet are presented, and excellent agreements with the experimental measurements are shown. Compared with the experimental measurements, the developed model can effectively save the cost when applied in the material design, which could be used to predict at any targeted temperature. Furthermore, the models could be used to determine the underlying control mechanisms of the temperature dependence of the hardness of the materials.

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Silvestre, J., N. Silvestre e J. de Brito. "An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites". Journal of Nanomaterials 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/106494.

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Due to their prominent properties (mechanical, stiffness, strength, thermal stability), ceramic composite materials (CMC) have been widely applied in automotive, industrial and aerospace engineering, as well as in biomedical and electronic devices. Because monolithic ceramics exhibit brittle behaviour and low electrical conductivity, CMCs have been greatly improved in the last decade. CMCs are produced from ceramic fibres embedded in a ceramic matrix, for which several ceramic materials (oxide or non-oxide) are used for the fibres and the matrix. Due to the large diversity of available fibres, the properties of CMCs can be adapted to achieve structural targets. They are especially valuable for structural components with demanding mechanical and thermal requirements. However, with the advent of nanoparticles in this century, the research interests in CMCs are now changing from classical reinforcement (e.g., microscale fibres) to new types of reinforcement at nanoscale. This review paper presents the current state of knowledge on processing and mechanical properties of a new generation of CMCs: Ceramics Nanocomposites (CNCs).

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Galusek, D., Z. Lencés, P. Sajgalík e Ralf Riedel. "Thermal analysis study of polymer-to-ceramic conversion of organosilicon precursors". Journal of Mining and Metallurgy, Section B: Metallurgy 44, n. 1 (2008): 35–38. http://dx.doi.org/10.2298/jmmb0801035g.

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The organosilicon precursors attract significant attention as substances, which upon heating in inert or reactive atmosphere convert directly to oxide or non-oxide ceramics, like nitrides, carbides, carbonitrides, boroncarbonitrides, oxycarbides, alons, etc. In characterisation, and in study of conversion of these polymers to ceramics thermal analysis plays an important role. The degree of cross-linking of the polymer vital for achievement of high ceramic yield is estimated with the use of thermal mechanical analysis (TMA). Decomposition of polymers and their conversion to ceramics is studied by the combination of differential thermal analysis (DTA), differential scanning calorimetry (DSC) thermogravimetry(TG), and mass spectrometry (MS). The use of these methods in study of the polymer-to-ceramic conversion is illustrated by case studies of a commercially available poly(allyl)carbosilane as the precursor of SiC, and a poly(hydridomethyl)silazane as the precursor of SiCN.

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Bao, X. Y., Song Li, Xiao Xia Tang e Yue Zhang. "Synthesis of Si-N-C Ceramic Composites by Pyrolysis of Polysilazane and Polycarbosilane". Key Engineering Materials 512-515 (giugno 2012): 306–9. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.306.

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Non-oxide ceramics derived from organo-elemental precursors in the system Si-N-C has attracted much attention for its excellent properties. Typically, the Si-N-C ceramic shows homogeneous elemental distribution, better high-temperature stability and oxidation resistance which making them attractive for applying in various branches of technology. A novel amorphous ceramic is fabricated from precursors mixed by polysilazane (PSZ) and polycarbosilane (PCS). The Si-N-C ceramics (PSZ/PCS=2 (w/w)) are heat-treated between 1200°C and 1500°C in nitrogen to crystallization of microcrystalline α-Si3N4 and nanocrystalline SiC. The obtained Si-N-C ceramics are characterized by density, ceramic yield, porosity, X-ray diffraction and Scanning electron microscope to analyze the crystallization and microstructure. The experimental results indicate that the ratio of PSZ/PCS and the annealing temperature have a big influence on the crystallization behavior.

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Più fonti

Tesi sul tema "Non oxyde ceramic"

Schlienger, Sébastien. "Nouvelles voies de synthèses de carbones et céramiques non-oxydes à porosités contrôlées". Thesis, Mulhouse, 2011. http://www.theses.fr/2011MULH5991.

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Les matériaux nanoporeux (méso- et/ou micro-poreux) visent des applications en relation avec les phénomènes d’adsorption tels que la catalyse, la dépollution, le stockage de gaz ou d’énergie,… Récemment, différents types de synthèses ont donc été développés pour contrôler la porosité et l’adapter aux applications visées : synthèse par voie directe, procédé de nanomoulage, technique de réplication réactive. Pour la très grande majorité d’entre elles, elles servent à l’élaboration des matériaux oxydes méso- et micro-poreuses. L’objectif de ce travail de thèse a donc été d’étendre ces procédés à une gamme de matériaux plus large au niveau des compositions chimiques, tout en gardant un contrôle de la porosité. En effet, les oxydes poreux ont un champ d’application limité du fait, par exemple, de leur température maximale d’utilisation, de leur fragilité sous certaines atmosphères ou encore, dans certains cas, de leurs propriétés d’adsorption mal adaptées. Afin de réduire ces limitations, nous avons cherché à étendre la gamme de composition chimique des matériaux poreux dans le domaine non-oxyde (carbone, céramiques de type nitrure, …) tout en contrôlant leur porosité. Pour cela, différentes approches ont été utilisées. La première approche a consisté à étudier mécanisme de formation des matériaux carbonés mésostructurés obtenus directement par l’auto-assemblage d’un tensioactif et d’un polymère précurseur de carbone. Nous avons alors pu déterminer les paramètres pertinents à contrôler pour la reproductibilité des synthèses ayant lieu, aussi bien, en phase aqueuse que par évaporation de solvant. Des analogies avec les mécanismes de formation des matériaux siliciques ont pu être mises en évidence. [...]
Nanoporous materials (meso-and / or micro-porous) target applications in relation to the adsorption phenomena such as catalysis, waste removal, gas or energy storage.... Recently, various types of syntheses have been developed to control the porosity and adapted to applications: direct route synthesis, nanocasting process, reactive templating. For most of them, they are used for the preparation of meso-and micro-porous oxide materials. The objective of this thesis was therefore to extend these methods to a wider range of materials in chemical composition, while keeping control of the porosity. Indeed, the porous oxides have a limited scope because, for example, their maximum operating temperature, their fragility under certain atmospheres or in some cases, their adsorption properties, are unsuitable. To reduce these limitations, we searched to extend the range of chemical composition of porous materials in the non-oxide field (carbon, nitride ceramics,...) while controlling their porosity. For this, different approaches were used. The first approach consisted to study formation mechanism of mesostructured carbon materials obtained directly by the self-assembly of a surfactant and a polymer carbon precursor. We were then able to determine the relevant parameters to control syntheses reproducibility taking place both in aqueous phase and by solvent evaporation. Analogies with the formation mechanisms of siliceous materials have been identified. With a better understanding of the formation mechanisms, we declined in a second time this method of direct synthesis to other materials by varying the nature of the precursors. Thus, a "green" synthesis of a carbonaceous material with ordered mesoporosity was developed in the absence of all toxic reagents such as formaldehyde and phenol, by using a natural precursor, the mimosa tannin. [...]

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Ben, Miled Marwan. "Synthèse in situ de nanoparticules métalliques dans une matrice céramique dérivées de polymères précéramiques pour l'électrolyse de l'eau en milieu alcalin". Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0083.

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Face au réchauffement climatique dû aux activités humaines et à l’utilisation de ressources fossiles, le besoin de trouver de nouvelles sources d’énergies décarbonées devient urgent. Le dihydrogène (H2) communément appelé « hydrogène » s’impose comme un vecteur énergétique d’intérêt de par sa capacité à produire une énergie de combustion supérieure à celle des énergies fossiles et à ne produire que de l’eau comme déchet lors de son utilisation dans une pile à combustible. De plus, son utilisation ne génère aucune nuisance sonore à la différence des moteurs thermiques couramment employés. Néanmoins, elle requiert un très haut degré de pureté afin d’éviter la pollution des matériaux catalytiques contenus dans ces piles à combustible. De nos jours, près de 95% de l’hydrogène produit se fait par reformage catalytique du méthane et nécessite donc des procédés de purification souvent complexes et couteux. Une façon de s’affranchir de ces procédés serait de produire l’hydrogène directement par électrolyse de l’eau. Cette méthode consiste à séparer une molécule d’eau sous l’action d’un courant électrique (produit de façon renouvelable) pour produire de l’hydrogène et du dioxygène (O2) aux bornes d’électrodes d’un électrolyseur. Malheureusement, cette réaction se heurte à des limitations cinétiques en raison d’un mécanisme de réaction de dégagement de dioxygène (RDO) très complexe, incluant plusieurs électrons et plusieurs intermédiaires réactionnel. L’émergence de nouvelles technologies de membranes échangeuses d’anion a ouvert la voie à l’utilisation de l’électrolyse en milieu alcalin, permettant donc l’utilisation de métaux de transition non nobles comme catalyseurs, moins couteux que les métaux traditionnellement employés (Ir et Ru). Ce manuscrit de thèse a donc exploré la synthèse de matériaux à visée catalytique pour réduire les barrières énergétiques et cinétiques de la RDO. Afin de proposer des matériaux performants, stables dans le temps et résistant aux milieux agressifs imposés par l’électrolyse de l’eau en milieu alcalin, la voie des céramiques dérivées de polymères précéramiques (PDC pour Polymer-Derived Ceramics) s’est avéré être une méthode d’élaboration de choix pour y parvenir. L’intérêt de cette méthode est de mettre en œuvre des polymères organosiliciés (ici un polysilazane) servant de plateforme moléculaire pour la croissance de métaux non nobles via l’utilisation de complexes métalliques tels que des chlorures et des acétylacétonates de nickel (Ni), de fer (Fe) ou encore de cobalt (Co). Ce polymère modifié par ces métaux sert de précurseur à la formation in situ de nanoparticules métalliques dans une matrice poreuse à base des éléments silicium (Si), carbone (C), oxygène (O) et azote (N) et garantissant leur accessibilité et stabilité après traitement thermique à 500°C sous argon. Ce manuscrit illustré à travers cinq chapitres décrit des travaux sur la synthèse et la caractérisation de nanoparticules de Ni (chapitre 3), Ni-Fe (chapitre 4) et d’alliages à moyenne et haute entropie (chapitre 5) qui complètent un état de l’art (chapitre 1) et une description des matériaux et méthodes mises en œuvre au cours de cette thèse (chapitre 2). Les matériaux formés ont été étudiés à chaque étape de leur synthèse à travers la mise en œuvre d’outils de caractérisation complémentaires avant d’en évaluer les performances électrochimiques ; notamment par mesure de la surtension anodique lors de la RDO afin d’identifier la meilleure combinaison métallique. Des tests post mortem ont été réalisés pour évaluer le potentiel des matériaux préparés. Compte tenu de la simplicité de la voie de synthèse et du faible coût des réactifs utilisés, ces travaux conduisent à une nouvelle famille de matériaux et à plusieurs perspectives prometteuses, non seulement pour le développement de catalyseurs efficaces et stables pour l'OER mais plus généralement pour de nombreuses applications en électrochimie. Ces opportunités sont désormais exploitées
Global warming caused by human activity and the use of fossil fuels, urges the need to find new sources of carbon free energy. Dihydrogen (H2) more known as “hydrogen” is rapidly emerging as a technically viable and benign energy vector according to its ability to produce a higher density of combustion than fossil fuels and to produce only water as a waste product when used in a fuel cell. Moreover, its use generates no noise pollution, unlike the combustion engines currently in use. Nevertheless, it requires a very high degree of purity in order to avoid pollution of the catalytic materials contained in the cells. Nowadays, nearly 95% of the hydrogen produced is obtained by catalytic reforming of methane, and therefore requires purification processes that are often complex and costly. One way of avoiding these purification steps would be to produce hydrogen directly by electrolysis of water more known as water splitting. This process consists of separating a molecule of water under the action of an electric current (produced in a renewable way) to produce hydrogen and dioxygen (O2) at the electrodes of an electrolyser. Unfortunately, this reaction has kinetic limitations due to a very complex Oxygen Evolution Reaction (OER) mechanism, including several electrons and several reaction intermediates. The emergence of new anion exchange membrane technologies has paved the way for the use of electrolysis in alkaline media, thus allowing the use of non-noble transition metals as catalysts, which are less expensive than the metals traditionally used (Ir and Ru). Within this context, this PhD thesis has explored the synthesis of catalytic materials to reduce the energy and kinetic barriers of OER. In order to propose materials that are performant, stable over time and resistant to the aggressive environments imposed by the electrolysis of water in an alkaline medium, the polymer-derived ceramics (PDC) route has been selected as a synthesis method of choice. The interest of this method is to implement organosilicon polymers (here a polysilazane) serving as a molecular platform for the growth of non-noble metals via the use of metal complexes such as chlorides and acetylacetonates of nickel (Ni), iron (Fe) or cobalt (Co). This polymer modified by these metals serves as a precursor for the in situ formation of metal nanoparticles in a porous matrix based on the elements silicon (Si), carbon (C), oxygen (O) and nitrogen (N) allowing their accessibility and stability after heat treatment at 500 ° C under argon. This manuscript illustrated through five chapters describes works dedicated to the synthesis and characterization of Ni (chapter 3), Ni-Fe (chapter 4) and medium and high entropy alloys (chapter 5) nanoparticles which complete a state of the art (chapter 1) and a description of the materials and methods implemented during this thesis (chapter 2). The materials which have been prepared were studied at each stage of their synthesis through the implementation of complementary characterization tools before assessing their electrochemical performances; in particular by measuring the anodic overpotential during OER, in order to determine the best metal combinations. Post mortem tests were carried out to evaluate the potential of the prepared materials. Considering the simplicity of the synthesis route, and the low cost of reactants used, this work leads to a new family of materials and to several promising perspectives, not only for the development of efficient and stable catalysts for the OER but more generally for numerous applications in electrochemistry. These opportunities are now being addressed

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Tao, Ming. "Proprietes electriques du joint de grains de la ceramique a base d'oxyde de zinc : application aux varistances basse-tension". Toulouse 3, 1987. http://www.theses.fr/1987TOU30249.

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A l'aide d'une methode originale de microsoudure par ultra-sons, nous placons un fil-electrode de part et d'autre d'un joint de grains, permettant ainsi d'effectuer toutes les etudes experimentales de ce dernier. En se basant sur les differentes caracteristiques i(v) mesurees de plusieurs joints, nous proposons 3 modeles de simulation relatifs a la caracteristique i(v) globale d'une varistance. Les calculs mettent en evidence l'influence du pourcentage optimal de "bons joints" sur les proprietes electriques (coefficient de non-linearite, courant de fuite, tension de seuil, regime de saturation) des varistances zno a basse tension de seuil. Realisation et caracterisation de varistances a gros grains (100 um-200 um) a partir d'une technique de grains germes

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Seron, Alain. "Synthèse ß'-SiAlON par hydrogéno réduction nitrurante : application à l'élaboration de films sur des composites thermostructuraux". Orléans, 1993. http://www.theses.fr/1993ORLE2035.

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Bien que les composites carbones représentent une avancée technologique notoire dans le domaine des matériaux thermostructuraux, leur utilisation reste limitée par une forte réactivité en atmosphère oxygénée. L'objectif de cette étude était donc de revêtir la surface de tels composites d'une couche de céramique capable de s'opposer à la diffusion des composes oxygénés vers les sites actifs. La méthode choisie consiste en un dépôt, sur les pièces à revêtir, d'un réactif en suspension ou en milieu sol-gel, suivi d'une étape de céramisation. De part leurs propriétés physico-chimiques, les ß'-SiAlON conviennent à la réalisation d'une telle barrière. Classiquement ils sont obtenus par frittage de poudres, à haute température, procédé inadapté à l'obtention de films. Il est donc apparu nécessaire, dans un premier temps, de mettre au point une nouvelle méthode permettant la synthèse de ces oxynitrures a basse température. Elle consiste en une réduction nitrurante de composes aluminosilicates par un flux gazeux mixte d'azote et d'hydrogène. L'élaboration des ß'-SiAlON sur des surfaces dépourvues de carbone libre (sic. Alumine) apparaît impossible. Le couplage de l'analyse thermogravimétrique avec la spectrométrie de masse démontre, dans le cas de creusets en graphite, la formation de méthane dans la phase gazeuse. Lorsque ce compose est associe à l'hydrogène et à l'azote, il est possible d'obtenir du ß'-SiAlON en l'absence de carbone libre. Des dépôts de kaolin obtenus par sédimentation lente des particules mises en suspension ont été transformes en films denses de ß'-SiAlON à la surface de composites

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Gasse, Adrien. "Rôle des interfaces dans le brasage non réactif du SiC par les siliciures de Co et de Cu". Grenoble INPG, 1996. http://www.theses.fr/1996INPG0114.

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Nous avons etudie le mouillage et le brasage refractaire non reactif du sic par les siliciures non reactifs de co et de cu. La cinetique d'etalement du siliciure de cu sur le sic est controlee par la desoxydation de l'alliage liquide et du sic, que ce soit sous vide secondaire ou sous argon. Dans ce dernier cas, un phenomene de demouillage est observe lors du refroidissement du a la reoxydation du sic. Avec des siliciures de co, les temperatures elevees utilisees permettent une desoxydation rapide et aucun demouillage n'est observe. Le bon mouillage des alliages co-si sur le sic temoigne de fortes interactions chimiques localisees a l'interface entre l'alliage liquide co-si et le sic. Nous montrons que la configuration de brasage conditionne le remplissage du joint par la brasure, ceci etant lie au mecanisme controlant l'etalement. Lors du brasage du sic par les siliciures de co, les contraintes thermomecaniques dues au differentiel de coefficient de dilatation entre la brasure et le sic conduisent a une fissuration de la brasure, sans que la cohesion sic/siliciure n'en soit affectee. Dans le cas particulier du compose cosi#2, la brasure se solidifie sous la forme d'un monocristal et les fissures se propagent dans les plans de type 110 de faible tenacite. Les interfaces sic/cosi#2 ont ete etudiees en met en mode conventionnel, en microscopie electronique haute resolution et en spectrometrie de perte d'energie des electrons. Des dislocations presentes a proximite des interfaces permettent une relaxation des contraintes thermomecaniques au dessus de 1000c. L'interface est cristallographiquement abrupte (sans interphases) et des relations d'orientation particulieres sont observees entre le sic et le cosi#2, l'accomodation des reseaux a l'interface s'effectuant par des dislocations de misfit. La transition entre cosi#2 et sic s'effectue par un enrichissement en si cote cosi#2 et un appauvrissement en c cote sic

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Fayeulle, Dominique. "Elaboration et étude de révêtements céramiques à sous-couche d'accrochage cellulaire pour la protection chimique et thermique de composants de turbomachines". Paris, ENMP, 1989. http://www.theses.fr/1989ENMP0149.

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Etude d'un nouveau procédé de fabrication des barrières thermiques fondé sur le dépôt électrophorétique d'une couche métallique (nicraly+ta) pour obtenir des sous-couches d'accrochage par aluminisation en phase vapeur avant la réalisation des barrières thermiques par projection plasma de zircone partiellement stabilisée. On analyse les propriétés des produits réalisés par ce procédé et leur potentiel d'application pour la protection des composants de turbomachines

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Hassine, Nabile. "Microwave-assisted synthesis of non-oxide ceramic powders". Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240494.

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Bras, François. "Étude et modélisation de l'endommagement des composites stratifiés SIC-SIC : exploitation d'essais statiques et de type Hopkinson". Cachan, Ecole normale supérieure, 1996. http://www.theses.fr/1996DENS0012.

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La connaissance du comportement dynamique de composites stratifies sic-sic sous sollicitations dynamiques est utile pour dimensionner certaines protections balistiques. Tout d'abord, nous avons choisi, dans ce travail de modélisation et d'identification du comportement, l'échelle mésoscopique du pli orthotrope sic-sic, qui présente l'intérêt de décrire de façon relativement simple les mécanismes de dégradation dans le plan du stratifie, le délaminage n'étant pas aborde. Le comportement du pli élémentaire est étudié au moyen de la mécanique de l'endommagement, avec l'utilisation d'un endommagement retarde, qui permet une description saine de la rupture et la prise en compte des effets dynamiques. Les paramètres du comportement qui peuvent être identifies lors d'essais statiques sont détermines avant de réaliser des essais dynamiques type Hopkinson en compression et en flexion. Nous développons un outil de simulation numérique de ces essais, base sur la théorie des poutres de Timoshenko, appliquée dans un cas hétérogène et non linéaire. Un schéma d'intégration aux différences centrées y est utilise. Pour analyser l'écart existant entre les simulations avec chargement en effort ou en vitesse de la compression dynamique d'une éprouvette, nous avons créé une interface, de rigidité variable, qui montre que les simulations en vitesse y sont très sensibles, contrairement aux simulations en effort. L'effet d'un contact tridimensionnel barre-éprouvette est également étudié. Les essais de flexion mettent aussi en évidence l'influence des conditions aux limites, qui conduit notamment a effectuer une simulation hybride : en vitesse lors du contact barre-éprouvette, en effort sinon. Ainsi, la simulation permet de prévoir qualitativement l'endommagement constate expérimentalement, mais le manque de concordance des données en empêche la quantification. Les perspectives résident alors dans une simulation tridimensionnelle des essais et dans l'amélioration des essais de flexion.

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Ashley, Nicholas J. "Defect Properties of Binary Non-Oxide Ceramics". Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520879.

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Mansour, Rabih. "Mode I Interlaminar Fracture Properties of Oxide and Non-Oxide Ceramic Matrix Composites". University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1494248628194216.

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Più fonti

Libri sul tema "Non oxyde ceramic"

Stuart, Hampshire, e Commission of the European Communities., a cura di. Non-oxide technical and engineering ceramics. London: Elsevier Applied Science, 1986.

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Martin, Jansen, a cura di. High performance non-oxide ceramics. Berlin: Springer, 2002.

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Hampshire, Stuart, a cura di. Non-Oxide Technical and Engineering Ceramics. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3423-8.

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Jansen, Martin, a cura di. High Performance Non-Oxide Ceramics II. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45623-6.

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Stuart, Hampshire. Non-Oxide Technical and Engineering Ceramics. Dordrecht: Springer Netherlands, 1987.

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Huang, Zhenkun, e Laner Wu. Phase Equilibria Diagrams of High Temperature Non-oxide Ceramics. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0463-7.

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Müller, E., M. Jansen, F. Aldinger, H. J. Seifert, U. Herzog, S. Frühauf, B. Jäschke, T. Jäschke, G. Roewer e K. Trommer. High Performance Non-Oxide Ceramics I. Springer, 2011.

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ühauf, S., M. Jansen, F. Aldinger e U. Herzog. High Performance Non-Oxide Ceramics I. Springer London, Limited, 2003.

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(Contributor), R. Haubner, M. Herrmann (Contributor), B. Lux (Contributor), G. Petzow (Contributor), R. Weissenbacher (Contributor), M. Wilhelm (Contributor) e M. Jansen (Editor), a cura di. High Performance Non-Oxide Ceramics II (Structure and Bonding). Springer, 2002.

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(Contributor), F. Aldinger, S. Frühauf (Contributor), U. Herzog (Contributor), M. Jansen (Contributor Editor), B. Jäschke (Contributor), T. Jäschke (Contributor), E. Müller (Contributor), G. Roewer (Contributor), H. J. Seifert (Contributor) e K. Trommer (Contributor), a cura di. High Performance Non-Oxide Ceramics I (Structure and Bonding). Springer, 2002.

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Capitoli di libri sul tema "Non oxyde ceramic"

Knoch, Heinrich. "Non-Oxide Technical Ceramics". In 2nd European Symposium on Engineering Ceramics, 151–69. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1105-5_7.

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Kusunose, Takafumi, e Tohru Sekino. "Non-Oxide Ceramic Nanocomposites with Multifunctionality". In SiAlONs and Non-oxides, 45–48. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-00-x.45.

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Mühlratzer, August, e Martin Leuchs. "Applications of Non-Oxide CMCs". In High Temperature Ceramic Matrix Composites, 288–98. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527605622.ch46.

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Yang, Jinlong, e Yong Huang. "Gelcasting of Non-oxide Ceramics". In Novel Colloidal Forming of Ceramics, 225–310. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1872-0_5.

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Kalemtas, A., Gürsoy Arslan e Ferhat Kara. "Pressureless Melt Infiltrated Non-Oxide Ceramic-Metal Composites". In SiAlONs and Non-oxides, 251–52. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908454-00-x.251.

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Brunner, Dieter G., Gaby Böhm, Friedrich Raether e Andreas Klimera. "Debindering of Non Oxide Ceramics under Protective Atmosphere". In Ceramic Transactions Series, 77–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470909836.ch7.

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Lewis, M. H., S. Mason e A. Szweda. "Syalon Ceramic for Application at High Temperature and Stress". In Non-Oxide Technical and Engineering Ceramics, 175–90. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3423-8_13.

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McDonnell, L., e E. M. Cashell. "Non-destructive Evaluation of Ceramic Surfaces and Sub-surfaces". In Non-Oxide Technical and Engineering Ceramics, 213–21. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3423-8_16.

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Huang, Zhenkun, e Laner Wu. "Si3N4 Ceramics Systems". In Phase Equilibria Diagrams of High Temperature Non-oxide Ceramics, 1–50. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0463-7_1.

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Bosković, S., e E. Kostić. "Sintering and some Properties of Si3N4 Based Ceramics". In Non-Oxide Technical and Engineering Ceramics, 165–74. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3423-8_12.

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Atti di convegni sul tema "Non oxyde ceramic"

Hille, Carmen, Wolfgang Lippmann, Marion Herrmann e Antonio Hurtado. "Non-Oxide Ceramics: Chances for Application in Nuclear Hydrogen Production". In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48408.

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Research and development are increasingly focusing on the provision and utilization of heat in the high-temperature range above 900 °C, in particular under the aspect of resource-saving energy technologies. On the one hand, the exploitation of the high-temperature range helps to improve the efficiency of energy conversion processes; on the other hand, the provision of high-temperature heat makes it possible to utilize innovative thermochemical processes, which in turn represent environmentally compatible processes. An example to be quoted here is the thermally induced production of hydrogen by the iodine-sulfur process. The high temperatures alone place extremely high requirements on the materials to be used so that metallic materials soon reach their limits of application. If additionally chemically aggressive process media are used, as in the iodine-sulfur process, basically only ceramic materials can be considered as construction materials. In this application, notably silicon carbide (SiC) is favored owing to its excellent high-temperature properties. The possible technical fields of application of such high-performance ceramics can be broadly extended provided that suitable, highly efficient joining methods are available for these ceramics. In addition to its use as a constructional ceramic, SiC can principally also be used as a functional ceramic. For this purpose, the basic ceramic is modified with different additives, providing it with electrical properties that permit its application as a full ceramic heat conductor or sensor. In this case, it also holds true that a suitable joining method for making electrically conductive joints will extend the fields of application considerably. Laser-based joining technologies are being developed for both applications at the Dresden University of Technology. The research work presented here notably focuses on laser joining of electrically conductive SiC ceramics. In addition to a CO2 laser, a diode laser has been used. Basically, electrical connection has been made in two ways. In the first variants, graphite pins are inserted into the joining zone as electrically conductive bridges. In an alternative concept, the oxidic glass filler itself is made electrically conductive with additives. Like that a full ceramic heating conductor joined by means of laser radiation has been tested. The temperature resistance and functionality of the laser-joined heating conductor could be fully demonstrated.

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Lippmann, Wolfgang, Marion Herrmann, Carmen Hille e Antonio Hurtado. "Laser Joining of Ceramics: A Contribution to High Temperature Range Application of Ceramic Components". In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48409.

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Non-oxide ceramics, such as silicon carbide (SiC) and silicon nitride (Si3N4), have excellent properties that make the materials interesting for application also in the nuclear sector. Due to their exceptional resistance to high temperatures, aggressive and abrasive media as well as nuclear radiation, the materials seem to be particularly suitable for developments in such fields as high-temperature reactors ((V)HTR) and peripheral systems (e.g. for hydrogen production). To simplify and thus to enable the technical application of these high-tech ceramics, the Dresden University of Technology has developed a laser beam joining process. This opens up many possibilities, e.g., to encase HTR fuel elements (as well as spheres and composites) in SiC, to encapsulate highly radioactive waste in SiC or to build a highly efficient heat transformer using high-temperature energy from VHT reactors. The progress made in laser beam technology in the last few years is a major element that has contributed to the developments achieved to date. Research has been focused mainly on the following three areas: (1) optimization of the laser parameters in combination with the advancement of oxide brazing fillers, (2) transfer of the basic technology to other high-tech ceramics like oxide ceramics, and (3) application of the laser process to develop electrically conductive joints. The possibility to laser join also Al2O3 and ZrO2 ceramics has created the opportunity to produce full ceramic sensors for (V)HTR specific applications at low cost. This requires adaptation of laser technology to the special properties of oxide ceramics. These are markedly less resistant to thermally induced stress than non-oxide ceramics, placing high requirements on laser process control. Another peculiarity is the property of oxide ceramics to be partly transparent to the laser wavelengths emitted by diode lasers (808 nm and 940 nm), with the result that the ceramic material is not heated primarily at the surface but inside its volume. This produces joint seams inside ceramic components even without any excessive thermal stress. The R&D work has made it possible to produce novel sensors for the high-temperature range that are also highly resistant to aggressive media. It is considered a further advantage that this joining technology has no special requirements regarding the process atmosphere such as vacuum or inert gas, which ensures that the process lends itself well to automation.

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Thapa, Juddha, Benjamin T. Chorpening e Michael P. Buric. "Non-contact temperature Raman measurement in YSZ and alumina ceramics". In Oxide-based Materials and Devices IX, a cura di Ferechteh H. Teherani, David C. Look e David J. Rogers. SPIE, 2018. http://dx.doi.org/10.1117/12.2291944.

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Bao, Y., D. T. Gawne e T. Zhang. "The Influence of Matrix Phase Viscosity on the Plasma-Spray Deposition of Silicon-Nitride Composite Coatings". In ITSC2003, a cura di Basil R. Marple e Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0263.

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Abstract Non-oxide ceramics, such as silicon nitride, have a unique combination of high strength, toughness, wear resistance, thermal and chemical stability. However, the use of these materials as thick protective coatings on engineering components has been severely restricted by their decomposition behavior. Silicon nitride, for instance, does not melt but decomposes at ~1900oC and so thermal spraying of pure silicon nitride powder is impracticable. A limited amount of research has been carried out on depositing silicon nitride in various metallic or ceramic matrix materials but none have produced adequate coating microstructures or coating properties. This paper concerns the design of oxide matrix systems for silicon nitride composite coatings. A quantitative model is developed for the viscous flow of two-phase feedstock particles on impact with the substrate and is applied to the deposition of silicon nitride – ceramic matrix coatings. A number of matrix systems are investigated including a series of yttria-alumina and yttria-alumina -silica compositions. The research shows that the oxide matrices successfully protect the silicon nitride from decomposition but that the matrix composition and particle loading have a critical influence on splat flow and coating quality.

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D'Orazio, Giancarlo, Grace E. Falanga, Zachariah Chazen, Jason Jones e Sadaf Sobhani. "Non-Oxide Ceramic Additive Manufacturing Processes for Aerospace Applications". In AIAA SCITECH 2023 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2023. http://dx.doi.org/10.2514/6.2023-0315.

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Suzuki, M., S. Sodeoka, T. Inoue e K. Ueno. "Basic Research for Reactive Plasma Spraying of TiO2". In ITSC 1998, a cura di Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1443.

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Abstract Reactive Plasma Spraying (RPS) is one of several new plasma spray processes. Some findings have been published on this technology, hi these reports, only metal powders, such as Ti, Cr and Si, were used for the fabrication of coatings composed of metal and non-oxide ceramics. When an oxide powder is used for starting materials to fabricate metal or non-ceramic coating, it is important to understand the reduction process of the oxide during spraying as well as the reaction among the powder, plasma and atmospheric gas. In this study, the effects of amounts and kinds of plasma and chamber gas, chamber pressure and the addition of carbon powder on the reduction of plasma sprayed TiO2 were investigated.

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MacBeth, J. W., M. O. Ten Eyck e R. W. Ohnsorg. "Non-oxide Ceramics for Advanced Heat Engine Applications". In SAE International Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1987. http://dx.doi.org/10.4271/870468.

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Singh, S. K., Shyamalendu M. Bose, S. N. Behera e B. K. Roul. "Preparation of Non Oxide Ceramics in Thermal Plasma". In MESOSCOPIC, NANOSCOPIC AND MACROSCOPIC MATERIALS: Proceedings of the International Workshop on Mesoscopic, Nanoscopic and Macroscopic Materials (IWMNMM-2008). AIP, 2008. http://dx.doi.org/10.1063/1.3027157.

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Floristán, M., R. Gadow e A. Killinger. "Electrically Conductive Plasma Sprayed Oxide-Metal Coatings on Glass Ceramic Substrates". In ITSC2009, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0612.

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Abstract Coating operations over glass ceramic substrates represent a new field for thermal spray applications. Due to the unique thermal and mechanical properties of glass ceramics, especially the low or even negative CTE, coating processes must be adapted to reduce the distribution of thermal stresses in the system and to not damage the substrate. This study investigates the deposition of a complex-shaped ceramic-metallic multilayer coating system that could potentially serve as a heating element in a glass ceramic cooking plate. To ensure coating adhesion, the substrates are preheated and their surfaces are grit blasted. In order to minimize stresses associated with the deposition of metal, the movement of the spraying mechanism was automated with robot control and new masking concepts were developed to ensure the accuracy of the shape and placement of the coating. The influence of spraying parameters on coating properties and residual stress distribution is analyzed as well.

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Kulinich, Ekaterina A., e Tamara A. Khabas. "Non-metal dental ceramics on the base of titanium oxide". In 2012 7th International Forum on Strategic Technology (IFOST). IEEE, 2012. http://dx.doi.org/10.1109/ifost.2012.6357598.

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