초록 ▼

A metal matrix composite comprising 2 to 80 volume % of .alpha.-alumina powder as a reinforcement, said .alpha.-alumina powder comprises polyhedral primary particles substantially having no fracture surface, D50 of .alpha.-alumina powder is 0.1 .mu.m to 50 .mu.m and a ratio of D50 to D10 is not more

A metal matrix composite comprising 2 to 80 volume % of .alpha.-alumina powder as a reinforcement, said .alpha.-alumina powder comprises polyhedral primary particles substantially having no fracture surface, D50 of .alpha.-alumina powder is 0.1 .mu.m to 50 .mu.m and a ratio of D50 to D10 is not more than 2, wherein D10 and D50 are particle sizes at 10% and 50% cumulation from the smallest particle side of a weight cumulative particle size distribution, respectively, and a process for producing the metal matrix composite which comprises infiltrating a molten metal into the .alpha.-alumina powder under pressure or non-pressure.

대표청구항 ▼

[ What is claimed is:] [1.] A metal matrix composite comprising 2 to 80 volume % of .alpha.-alumina powder as a reinforcement, said .alpha.-alumina powder comprising polyhedral primary particles having a ratio of the long diameter to short diameter of less than 5, which polyhedral primary particle h

[ What is claimed is:] [1.] A metal matrix composite comprising 2 to 80 volume % of .alpha.-alumina powder as a reinforcement, said .alpha.-alumina powder comprising polyhedral primary particles having a ratio of the long diameter to short diameter of less than 5, which polyhedral primary particle have no or substantially no fracture surface, wherein D50 of the .alpha.-alumina powder is 0.1 .mu.m to 50 .mu.m and a ratio of D50 to D10 of the .alpha.-alumina powder is not more than 2, wherein D10 and D50 are particle sizes at 10% and 50% cumulation from the smallest particle side of a weight cumulative particle size distribution, respectively, and wherein the .alpha.-alumina powder is a powder having a particle size distribution in which a ratio of D90 to D10 is not more than 3, wherein D10 and D90 are particle sizes at 10% and 90% cumulation from the smallest particle side of a weight cumulative particle size distribution, respectively.