Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1984-09-18
1999-11-09
Nelson, Peter A.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428565, 75248, 75254, B22F 708, C22C 500
Patent
active
059810815
ABSTRACT:
A new family of transition metal boride coatings having excellent wear and corrosion resistance is disclosed. The coatings comprise hard, ultrafine, transition metal boride particles dispersed in a metal matrix, the particles constituting from about 30 to about 90 volume percent of the coating, the balance being metal matrix. The average size of the particles ranges from about 0.5 to about 3.0 microns. The metal matrix contains at least one metal selected from the group consisting of nickel, cobalt and iron. The coatings may be prepared by a process which comprises depositing a mechanically blended powder mixture of a transition metal and a boron-containing alloy onto a substrate and then heat treating the as-deposited coating. The heat treatment effects a diffusion reaction between the deposited elements resulting in the formation of ultrafine particles of a transition metal boride dispersed in the metal matrix. The coating can be deposited onto the substrate using any of the known deposition techniques.
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Nelson Peter A.
O'Brien Cornelius F.
Union Carbide Coatings Service Corporation
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