Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1992-02-28
1994-07-19
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 13, 419 47, 75351, 75352, 75356, B22F 900
Patent
active
053307011
ABSTRACT:
A method is disclosed for controlling a self-propagating reaction in a particulate medium. The method comprises controlling the boundary heat flux of the reaction to produce reaction waves which travel through the particulate medium undergoing a self-propagating reaction. The method provides a product having a unitary, solid structure with layers of alternating density. Preferably the reaction is a reaction between two metals to produce an intermetallic compound or between a metal and a non-metal to produce a ceramic compound. Nickel aluminide is a preferred intermetallic compound. Also disclosed is a controlled reactive sintering process for producing a finely divided intermetallic compound comprising comminuting the layered body of intermetallic compound. Also disclosed are a process for preparing an abrasive surface composed of a nickel aluminide binder and an abrasive material, an injection molding composition for preparing shaped articles of nickel aluminide, and a process for injection molding shaped nickel aluminide articles of greater than 98% theoretical density.
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Alman David E.
Cooper Rene M.
German Randall M.
McCoy Kazuo P.
Shaw Karl G.
Mai Ngoclan T.
Walsh Donald P.
Xform, Inc.
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