High strength feldspathic porcelain

Details High strength feldspathic porcelain High strength feldspathic porcelain

1985-12-30

1988-01-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Clay containing

501153, C04B 3324

Patent

active

047176954

ABSTRACT:
High strength porcelain having an unglazed bending strength of greater than 1,400 kg/cm.sup.2 and consisting essentially of 22-85% by weight of SiO.sub.2, 10-73% by weight of Al.sub.2 O.sub.3, and 1.5-6.5% by weight of K.sub.2 O and/or Na.sub.2 O. The porcelain has a total degree of crystallinity of more than 40% by weight, and a crystalline grain size of not greater than 20 .mu.m, and it is free from defects of larger than 40 .mu.m. The procelain is produced by pulverizing a starting material mixture of quartz-feldspar-alumina system so that 85-95% by weight of particles thereof have a grain size of not greater than 10 .mu.m, calcining the mixture, adding clay-mineral material therein, pulverizing so that the clay-mineral-added mixture contains less than 85% by weight of particles with a grain size of not greater than 10 .mu.m, forming, drying, and firing at 1,100.degree.-1,400.degree. C.

REFERENCES:
patent: 3097101 (1963-07-01), Lester
patent: 3431126 (1969-03-01), Fukui
patent: 3674519 (1972-07-01), Higuchi et al.
patent: 3846098 (1974-11-01), Nakashima et al.
patent: 3860432 (1975-01-01), Higuchi et al.

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