Process for producing tungsten heavy alloy sheet using a metalli

Details Process for producing tungsten heavy alloy sheet using a metalli Process for producing tungsten heavy alloy sheet using a metalli

1988-01-14

1988-10-11

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

75248, 419 31, 419 36, 419 40, 419 43, 419 47, 419 53, 419 54, 419 57, 419 58, G22F 100

Patent

active

047770155

ABSTRACT:
A process is disclosed for producing a sheet of tungsten heavy alloy which involves uniformly blending metal powder compnents of the alloy by forming a slurry of the powder components and one or more chemical compounds of at least one of the components of the alloy as an inorganic binder in a liquid medium, the chemical compound being soluble in the liquid medium and capable of being decoposed into one or more of the metal components of the alloy below the melting point of the metal powder components, removing the liquid medium from the powder components and forming a planar cake of the powder components and said inorganic binder, drying the cake, heating the cake to a temperature sufficient to decompose the inroganic binders into their elemental components or oxides, followed by heating the cake in a reducing atmosphere at a temperature sufficient to reduce any oxides forming during the previous steps to the metals, and sintering the cake to a density equal to or greater than about 90% of the theoretical density of the alloy to form the sheet.

REFERENCES:
patent: 3658517 (1972-04-01), Davies et al.
patent: 3890145 (1975-06-01), Hivert et al.
patent: 4605599 (1986-08-01), Penrice et al.
patent: 4698096 (1987-10-01), Schmidberger et al.
patent: 4721599 (1988-01-01), Nakamura

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