Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1994-06-16
1996-04-30
Bradley, P. Austin
Metal founding
Process
Shaping liquid metal against a forming surface
164 98, B22D 1914
Patent
active
055116035
ABSTRACT:
Metal-matrix composites and methods for producing these composites are provided. The manufacturing methods include providing a ceramic preform having a uniform distribution of ceramic particles sintered to one another. The particles include an average particle size of no greater than about 3 microns, and at least one half of the volume of the preform is occupied by porosity. The preform is then disposed into a mold and contacted by molten metal. The molten metal is then forced into the pores of the preform and permitted to solidify to form a solid metal-matrix composite. This composite is machinable with a high-speed steel (HSS) bit for greater than about 1 minute without excessive wear occurring to the bit. This invention preferably employs metal-matrixes including Al, Li, Be, Pb, He, Au, Sn, Mg, Ti, Cu, and Zn. Preferred ceramics include oxides, borides, nitrides, carbides, carbon, or a mixture thereof. Inert gas pressures of less than about 3,000 psi can be used to easily infiltrate the preforms.
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Brown Alexander M.
Klier Eric M.
Bradley P. Austin
Chesapeake Composites Corporation
Herrick Randy
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