Abstract
Fast-fired porcelain may be produced by use of raw materials with very small particle sizes. Firing times of two hours were obtained. Especially the quartz must be very fine so as to change to cristobalite during fast firing. The casting slips show thixotropic behavior, but with suitable deflocculants these difficulties may be overcome. There are also no serious problems with dry and wet pressing. The firing cycle was as follows: heating up to 1300°C (1 hour) constant temperature at 1300°C (40 min) rapid cooling to 750°C (5 min) followed by cooling to 500°C (10 min). The microstructure of this porcelain is unusual; it consists of a glassy matrix containing spherical mullite. It has outstanding properties: high strength combined with high thermal shock resistance. Its transparency and whiteness equal those of high quality standard porcelain. This porcelain should also be of interest for technical applications.
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