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Ceramic matrix composite

About: Ceramic matrix composite is a research topic. Over the lifetime, 7807 publications have been published within this topic receiving 117020 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors performed micro-structural and mechanical characterizations on the materials, which revealed that the size of the carbonitride ceramic particle was significantly reduced when the Ta content was increased, which was attributed to the presence of intermetallic compounds in the binder phase.

33 citations

Journal ArticleDOI
TL;DR: In this paper, an application of combustion synthesis for producing ceramic-metal composites with reduced levels of porosity by allowing an excess amount of liquid metal, generated by the exothermic reaction, to infiltrate the pores is discussed.
Abstract: One of the main disadvantages of combustion synthesis of ceramic and composite materials is the relatively high levels of porosity,e.g., ≥50 pct, present in the product. This article discusses a novel application of combustion synthesis for producing ceramic-metal composites with reduced levels of porosity by allowing an excess amount of liquid metal, generated by the exothermic reaction, to infiltrate the pores. This application of combustion synthesis of ceramic-metal composite materials is discussed with respect to a model reaction system that utilizes an inexpensive oxide,i.e., TiO2, reacted with carbon and an excess stoichiometric amount of alu-minum. The aluminum is in the liquid state at the ignition temperature and is intentionally allowed to infiltrate the porous ceramic matrix,i.e., TiC-Al2O3, produced from the combustion synthesis reaction. Thisin situ process for producing ceramic-metal composites by the simul-taneous liquid metal infiltration of the pores in a ceramic matrix using the combustion synthesis approach provides considerable advantages over conventional processes which involve two stages,i.e., sintering followed by liquid metal infiltration. However, there are also certain limitations with respect to total penetration of the liquid metal into the porous ceramic matrix and main-taining a stable propagation of the combustion reaction.

33 citations

Journal ArticleDOI
TL;DR: In this paper, 10% BeO/UO2 composites were fabricated by SPS technique and the thermal physical performance above the sintering temperature was reported for the first time.

33 citations

Journal ArticleDOI
TL;DR: In this article, the combined effect of rapid sintering by spark-plasma-sintering (SPS) technique and mechanical milling of γ-Al2O3 nanopowder via high-energy ball milling (HEBM) was investigated.
Abstract: The combined effect of rapid sintering by spark-plasma-sintering (SPS) technique and mechanical milling of γ-Al2O3 nanopowder via high-energy ball milling (HEBM) on the microstructural development and mechanical properties of nanocrystalline alumina matrix composites toughened by 20 vol% silicon carbide whiskers was investigated. SiCw/γ-Al2O3 nanopowders processed by HEBM can be successfully consolidated to full density by SPS at a temperature as low as 1125°C and still retain a near-nanocrystalline matrix grain size (∼118 nm). However, to densify the same nanopowder mixture to full density without the benefit of HEBM procedure, the required temperature for sintering was higher than 1200°C, where one encountered excessive grain growth. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicated that HEBM did not lead to the transformation of γ-Al2O3 to α-Al2O3 of the starting powder but rather induced possible residual stress that enhances the densification at lower temperatures. The SiCw/HEBMγ-Al2O3 nanocomposite with grain size of 118 nm has attractive mechanical properties, i.e., Vickers hardness of 26.1 GPa and fracture toughness of 6.2 MPa·m1/2.

33 citations

Patent
31 Mar 1994
TL;DR: In this paper, a process for fabricating ceramic-metal composites having ceramic and metal phases wherein the ceramic to metal ratio changes within the ceramic matrix is described, and the process includes the steps of contacting a porous ceramic matrix material with a molten metal whereby capillary action pulls the metal into the porosity gradient to substantially fill the void space.
Abstract: A process for fabricating ceramic-metal composites having ceramic and metal phases wherein the ceramic to metal ratio changes within the ceramic. The process includes the steps of contacting a porous ceramic matrix material with a molten metal whereby capillary action pulls the metal into the ceramic matrix to substantially fill the void space. The ceramic matrix has a porosity gradient wherein the infiltrated composite has a varying ratio of ceramic to metal.

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202394
2022236
2021300
2020344
2019433
2018354