Powder metallurgy repair technique

Details Powder metallurgy repair technique Powder metallurgy repair technique

C - Chemistry, Metallurgy

22

C

C22C 19/05 (2006.01) B22F 7/04 (2006.01) B23K 31/02 (2006.01) B23K 35/32 (2006.01)

Patent

CA 2090489

To repair or join sections of a metal article, matching metal powder is sintered in the solid state to form a porous structure in the joint. A layer of matching powder, modified to incorporate melting point depressants such as boron and silicon is subse- quently added to the surface of the sintered region. The joint is processed at a temperature where the modified layer melts while the sintered layer and base metal remain solid. The modified material flows into the sintered layer by capillary action and pro- motes liquid phase sintering, resulting in a dense joint with properties approaching those of the base metal.

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