Al_2O_3/TiC/Ni系対称型傾斜機能材料の機械的特性に対する炭化珪素添加効果(<特集>セラミックス)

概要

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Symmetrically graded materials of the Al_2O_3-SiC/TiC/Ni/TiC/SiC-Al_2O_3 system were fabricated by SHS/HIP. Strong residual compressive stress can be induced in the outer layer due to the thermal expansion mismatch between the outer and inner layers, resulting in simultaneous enhancement of hardness, toughness and strength of the outer layer. The dispersion of SiC in the outer Al_2O_3 layer increased the residual stress comparing with the Al_2O_3/TiC/Ni/TiC/Al_2O_3 system because the thermal expansion coefficient of the outer layer was reduced with SiC having smaller thermal expansion coefficient than Al_20_3. Stress analysis was carried out for both systems by means of finite element method, and the relations of the internal stress distribution and mechanical properties were discussed.
社団法人日本材料学会の論文
1996-06-15