Abstract
The basic objective of this study is to establish the material design concepts for the coexistence of good high-temperature mechanical properties and super heat resistance in the systems of ceramic/metal and ceramic/ceramic functionally gradient materials (FGMs). Flexural and fracture toughness tests were conducted on gas-pressure combustion-sintered Cr 3 C 2 ceramic and its composites with Ni and TiC (Cr 3 C 2 /Ni, Cr 3 C 2 /TiC) in a vacuum environment up to 1 200°C using a newly developed materials testing system. Fracture characteristics were investigated on the basis of fracture mechanics and fractography. The toughness of Cr 3 C 2 can be improved by the addition of metallic particles. It is found that the principal mechanism of toughness improvement in these composites (ductile-phase reinforced ceramic matrix composites) is attributable to crack-tip plastic blunting by a ductile metallic phase.
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Schedule a callMore From: JSME international journal. Ser. A, Mechanics and material engineering
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