| 摘要 |
PROBLEM TO BE SOLVED: To provide a metallurgical composition of composite material formed by a metallic structural matrix and by a non-metallic solid lubricant, in which the metallurgical composition is adequate for the manufacture by means of conforming (densification) and sintering operations of sintered products presenting a low coefficient of friction allied to high mechanical strength and high hardness.SOLUTION: A metallurgical composition comprises: a main particulate metallic material, for example iron or nickel, and at least one alloy element for hardening the main particulate metallic material, which form a structural matrix (10); a particulate solid lubricant (20), such as graphite, hexagonal boron nitride or mixture thereof; and a particulate alloy element which is capable of forming, during the sintering of the composition conformed by compaction or by injection molding, a liquid phase, to agglomerate the solid lubricant (20) in discrete particles. The composition may comprise an alloy component to stabilize the alpha-iron matrix phase, during the sintering, in order to prevent the graphite solid lubricant from being solubilized in the iron.SELECTED DRAWING: Figure 4 |
