| 摘要 |
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 1,000-1,100.degree.C. The raw materials include kaolin and activated clay as principal raw materials, Mgcontaining, K-containing and F-containing compounds as auxiliary raw materials and B2O3 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 1,1001,250.degree.C.
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