WC/CoをドープしたAl_2O_3/TiC/Ni系傾斜機能材料の機械的特性

概要

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The Al_2O_3-WC-Co/TiC/Ni/TiC/Al_2O_3-WC-Co FGMs with a symmetrically graded structure were fabricated by SHS/HIP. It is possible to induce the strong residual compressive stress in the outer ceramic layers of the ceramic/metal/ceramic symmetric FGMs due to the thermal expansion mismatch between the outer and inner layers. The doping of WC-Co into the outer Al_2O_3 layers further increased the residual stress comparing with the Al_2O_3/TiC/Ni/TiC/Al_2O_3 system. The toughness and the strength of the outer layer increased to 13.1MPam^<1/2> and 950MPa by doping 20vol% of WC-Co, respectively. Stress analysis was carried out for the macro and micro structures of FGMs by means of X-ray diffraction method and finite element method. The correlation between the surface stress and the mechanical properties was discussed.
社団法人日本材料学会の論文
1997-07-15