Al_2O_3-BN/TiC/Ni系傾斜機能材料の作製と機械的特性(<特集>セラミック材料)

概要

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Symmetrically graded materials of the Al_2O_3-BN/TiC/Ni were fabricated by SHS/HIP. High residual compressive stresses were produced in the outer layer due to the thermal expansion mismatch between the outer Al_2O_3-BN ceramic and the inner TiC/Ni cermet layer. The dispersion of BN in the Al_2O_3 layer increased the residual stress to higher levels than that induced in the Al_2O_3/TiC/Ni system. The BN has the layer structure with cleavage faces. The tribological properties of the outer Al_2O_3-BN layer were investigated at room temperature and 500°C in air. The friction coefficient of the outer layer was lower than that of monolithic Al_2O_3, especally at 500°C. The residual compressive stress was found to improve wear resistance of the surface layer.
社団法人日本材料学会の論文
1999-06-15