Al₂O₃/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

抄録

Symmetrically graded materials of the Al₂O₃-SiC/TiC/Ni/TiC/SiC-Al₂O₃ 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 Al₂O₃ layer increased the residual stress comparing with the Al₂O₃/TiC/Ni/TiC/Al₂O₃ system because the thermal expansion coefficient of the outer layer was reduced with SiC having smaller thermal expansion coefficient than Al₂O₃. 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.