Production process of machinable ceramics

Details Production process of machinable ceramics Production process of machinable ceramics

1990-09-27

1991-06-25

Fisher, Richard V.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 33, 501 3, C03C 1016

Patent

active

050264125

ABSTRACT:
Machinable ceramics with 30-60 vol. % of fine crystals of fluorophlogopite, a synthetic mica, evenly dispersed in a vitreous matrix is produced using as principal raw materials kaolin and activated clay, which are natural minerals, other than metal oxides themselves. According to the production process, a mixture of fine particulate raw materials is calcined under first heat treatment conditions in which a maximum temperature is in the range of 1,000.degree.-1,100.degree. C. The raw materials include kaolin and activated clay as principal raw materials, Mg-containing, K-containing and F-containing compounds as auxiliary raw materials and B.sub.2 O.sub.3 as a sintering aid. The resulting calcined mass is ground into fine particles, followed by the formation of a green body of a desired shape. The green body is then sintered into a fired body under second heat treatment conditions in which a maximum temperature is in the range of 1,100.degree.-1,250.degree. C.

REFERENCES:
patent: 3756838 (1973-09-01), Beall
patent: 4777151 (1988-10-01), Koba et al.

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