セラミックスの延性金属相高靱化メカニズム

概要

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The basic objective of this study is to establish the material design concepts for the coexistence of good mechanical properties with super heat-resistance in the systems of ceramic/metal and ceramic/ceramic FGMs. Flexural and fracture toughness tests were conducted on gas-pressure combustion sintered Cr_3C_2 ceramic and its composites with Ni and TiC (Cr_3C_2/Ni, Cr_3C_2/TiC) in a vacuum environment up to 1200℃ using a newly developed materials testing system. Fracture characteristics were investigated on the basis of fracture mechanics and fractography. The toughness of Cr_3C_2 can be improved by the addition of metallic particles. It is found that the principal mechanism of toughness improvements in these composites (ductile-phase reinforced ceramic matrix composites) is attributed to crack tip blunting by a ductile metallic phase.
一般社団法人日本機械学会の論文
1993-05-25