Method for refining non-oxide ceramic powders

Details Method for refining non-oxide ceramic powders Method for refining non-oxide ceramic powders

Filed on

1987-07-01

Date issued

1990-03-20

Examiner

Derrington, James

Patent Class

Plastic and nonmetallic article shaping or treating: processes

SubClass

Including step of generating heat by friction

Other Related Categories

156635, 156646, 264344, C04B 3806

Type

Patent

Status

active

Patent number

049099736

Description

ABSTRACT:
A method for refining powders comprising the steps of: (a) adding polytetrafluoroethylene powders to non-oxide ceramic powders to form a mixture by mixing; and (b) heating the mixture in non-oxidizing atmosphere to convert oxides existing on the surface of the non-oxide ceramic powders into gaseous fluorides, and removing gaseous fluorides. The fluororesin is a polytetrafluoroethylene resin. The heating temperature in the non-oxidizing atmosphere is 500.degree. C. to 1300.degree. C.

REFERENCES:
patent: 4124665 (1978-11-01), Peterson et al.
patent: 4238434 (1980-12-01), Enomoto et al.
Brynestad et al, Communications of the American Ceramic Society, 1983, C-215 & 216.
Brynestad et al, Communications of the American Ceramic Society, 1984, C-184 & 185.

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