Cryogenic treatment of silicon nitride tool and machine parts

Details Cryogenic treatment of silicon nitride tool and machine parts Cryogenic treatment of silicon nitride tool and machine parts

1999-07-28

2000-12-26

Doerrler, William

Refrigeration

Processes

Treating an article

62 65, 148577, F25D 2500, F25D 1304, C21D 604

Patent

active

061640794

ABSTRACT:
This disclosure describes a cryogenic process for increasing the life of silicon nitride tool materials such as machining inserts used in the high-speed machining of cast irons and other materials. The process entails placing the tools in a cryogenic chamber where the temperature is lowered to about -320.degree. F. and held at that level for a period of time and then raised to ambient temperature. Both the lowering and raising of the temperature are at specifically controlled rates.

REFERENCES:
patent: 5259200 (1993-11-01), Kamody
patent: 5695830 (1997-12-01), Larnac et al.
patent: 5865913 (1999-02-01), Paulin et al.
patent: 6056857 (2000-05-01), Hunt et al.

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