Si_3N_4-SiC/Si_3N_4-Si_3N_4層状複合体の機械的挙動

概要

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The present study involves the fabrication of three-layered ceramics with an interior layer of SiC/Si_3N_4 which has a greater thermal expansion coefficient than the two outer surface layers formed of monolithic Si_3N_4.Surface compressive stress develops upon cooling owing to the higher thermal expansion coefficient of the inner layer. The bending strength and toughness of layered Si_3N_4 composites are substantially greater than those of monolithic Si_3N_4 because of the surface compressive stress on the outer layer and crack deflection by the interfaces. The residual stress increases with the addition of SiC in the inner layer and with the inner layer thickness. Crack behavior in layered samples is affected by the residual stresses, interfaces and free sample surfaces. Theoretical stress calculated based on beam theory is compared with the experimentally determined residual stress.
社団法人日本セラミックス協会の論文
1996-08-01