Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1995-12-18
1997-12-30
Yee, Deborah
Metal treatment
Stock
Age or precipitation hardened or strengthened
148407, 148408, 148409, 148411, 148415, 148326, 148328, 428627, 428632, C22C 2100, C22C 2300, C22C 2900, C22C 3800
Patent
active
057025428
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.
REFERENCES:
patent: 3574609 (1971-04-01), Finlay et al.
patent: 4710348 (1987-12-01), Brupbacher et al.
patent: 4731132 (1988-03-01), Alexander
patent: 4812289 (1989-03-01), Alexander
patent: 4834810 (1989-05-01), Benn et al.
patent: 5143795 (1992-09-01), Das et al.
Brown Alexander M.
Klier Eric M.
Dougherty David E.
Yee Deborah
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