Method of making a duo density silicon nitride article

Details Method of making a duo density silicon nitride article Method of making a duo density silicon nitride article

1973-12-20

1978-05-02

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 60, 264 63, 264 65, 264248, C04B 3558, C04B 3560

Patent

active

040875008

ABSTRACT:
A method of making a duo density article of silicon nitride is disclosed. A first element is formed by hot pressing silicon nitride particles. The general shape of a second element is formed by injection molding silicon metal particles and a binder and subsequently burning out the binder. The second element is nitrided in a nitriding operation. Facing surface areas of the first element and the second element are bonded together by applying heat to both elements and pressure to one of the elements while the other element is held in a fixed position.

REFERENCES:
patent: 2195297 (1938-09-01), Engle
patent: 2434271 (1948-01-01), Howatt
patent: 3399979 (1968-09-01), Hamling

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