Seal element of hard material sintered from a semi-finished form

Details Seal element of hard material sintered from a semi-finished form Seal element of hard material sintered from a semi-finished form

1989-10-02

1991-01-08

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 28, 419 36, 419 37, 264 62, 264 63, B22F 300

Patent

active

049833553

ABSTRACT:
A seal elements of hard material for use, for instance, as a pair of small plates which form the parts to control the fluid flow through a faucet. The seal is constructed of a hard material--a metal, a metallic oxide, a metallic carbide, a metallic nitride, a ceramic or glassy material--which is sintered from a semi-finished product obtained by mixing a powder of fine particle size of the aforementioned hard materials with an organic binder--a plastic material, a wax, or a combination of these substances. This mixture is formed under compression in a mold and, eventually, at least some of the binder is eliminated. The seal can emerge already finished from the sintering operation, or it can be subjected to some other treatment of its surface, that is, it can be lapped or it can be treated galvanically or it can be covered with a thin layer of a harder material--silicon carbide or another metallic carbide, a metallic nitride, or carbon with a cubic crystallographic lattice structure--applied by physical or chemical vapor deposition.

REFERENCES:
patent: 3909310 (1975-09-01), Uy
patent: 3981062 (1976-09-01), Moskowitz et al.
patent: 4280841 (1981-07-01), Ito et al.

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