多孔質アルミニウム焼結体の特性に及ぼす原料粒径の影響

Abstract

In the powder metallurgical process, porous aluminium compacts were prepared by using pure aluminium powders and resin particles as the raw materials. The resin powders classified at more than 250 μm, 110∼250 μm, and less than 110 μm mixed with pure-aluminium powder having average particle size of 20 μm, 10 μm, and 3 μm at the content of 56 vol.%. This mixtures were press-molded into column shape (d=11 mm, L=16∼17 mm). To form pores, resin particles in the green compacts were removed by heat-treatment at 380°C in Ar-gas flow, and then the compacts were sintered at 655°C for 2 hours in vacuum. Effects of particle size of raw materials on the densities and static compressive properties at room temperature for sintered compacts were mainly investigated. The relative densities of sintered compacts were within the range of 39%∼47% on the above-mentioned process conditions. Reduction in particle size of either aluminiun powder or resin particle resulted in higher density. The compressive strength increased with dcreasing the size of aluminium powder. When aluminium powder was 10 μm and 3 μm, the compressive strength increased with decreasing size of resin particle. Especially, the sintered compacts originating in resin particle less than 110 μm had much higher strength than the others regardless of size for aluminium powder.