초록 ▼

A hard facing alloy is applied to a surface of a substrate by making a mixture of at least two constituents whose net composition is the desired hard facing alloy composition. The constituents have different solidus temperatures, at least one of which is above a processing temperature of the substra

A hard facing alloy is applied to a surface of a substrate by making a mixture of at least two constituents whose net composition is the desired hard facing alloy composition. The constituents have different solidus temperatures, at least one of which is above a processing temperature of the substrate and another of which is below the processing temperature of the substrate. In one preferred approach, the mixture is prepared by pressing and lightly sintering the constituents in the form of powders, so that the mixture retains its shape and can be attached to the substrate surface. Then the substrate is heated to the processing temperature and maintained for a time sufficient to permit interdiffusion of the several different phases toward a homogeneous hard facing alloy composition uniformly through a major portion of the volume.

대표청구항 ▼

[ What is claimed is:] [1.] A process for hard facing a substrate, comprising the steps of:providing a hard facing alloy composition which is a mixture of at least two alloy constituents whose net composition is that of the hard facing alloy, further comprising a first constituent having a solidus t

[ What is claimed is:] [1.] A process for hard facing a substrate, comprising the steps of:providing a hard facing alloy composition which is a mixture of at least two alloy constituents whose net composition is that of the hard facing alloy, further comprising a first constituent having a solidus temperature lower than a solidus temperature of any other constituent and a second constituent having a liquidus temperature higher than a liquidus temperature of any other constituent wherein the hard facing alloy composition consists essentially of, in weight percent, from about 12 to about 25 percent chromium, from about 12 to about 19 percent molybdenum, from about 4 to about 6 percent silicon, from 0 to about 0.6 percent boron, from 0 to about 10 percent nickel, balance cobalt;applying the mixture of constituents to a surface of the substrate;heating the surface and mixture of constituents to a hard facing temperature that is higher than the solidus temperature of the first constituent and lower both than the liquidus temperature of the second constituent and the melting temperature of the substrate; andmaintaining the hard facing temperature for a time sufficient to consolidate and interdiffuse the constituents of the mixture to form the hard facing composition.