Patent ID: 6022508
Filing Date: 2000-02-08
Classification: C22C

Abstract:
A method of powder metallurgical manufacturing of a composite material containing particles in a metal matrix, said composite material having a high wear resistance in combination with a high toughness, comprising:dispersing in a first matrix comprising powder particles (I) of a first powder of a first metal or alloy a first content of hard particles (HT) to form a first dispersion,dispersing the first dispersion in a second matrix comprising powder particles (II) of a second powder of a second metal or alloy a second content of hard particles dispersed in the second matrix of the second powder particles, wherein the second content is lower than the first content and wherein the ratio (D.sub.I /D.sub.II) between the mean diameter (D.sub.I) the powder particles of the first powder and the mean diameter (D.sub.II) of the powder particles of the second powder is selected such that a proportion of said first powder in a mixture of said first and second powders lies in the shadowed area in the graph in the accompanying FIG. 4 and that contact between the hard particles, between the hard particles and the first powder, and between the particles of the first powder is essentially avoided, andtransforming the mixture to a solid body through hot compaction.