Abstract
Al2O3 particles (mean diameter: 250μm) were coated with fine Ni particles (mean diameter: 5μm) by an agglomeration coating technique. The Ni content was 40-50vol%. The compact of the coated particles was sintered at a temperature of 1200°-1500°C. The use of the coated particles resulted in uniform dispersion of Al2O3 particles in Ni matrix. The pre-coating of Al2O3 particles with fine W particles (mean diameter: 1μm) was effective to improve the adhesion and wettability of Ni to Al2O3. Although the relative density of the sintered body was 70-80%, the dense composite was produced by the infiltration of molten Ni into the porous sintered body.
