C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/37
C04B 33/24 (2006.01) C04B 33/26 (2006.01)
Patent
CA 1258079
Abstract of the Disclosure High strength porcelain having an unglazed bending strength of more than 1,400 kg/cm2 and consisting essentially of 22-85% by weight of SiO2, 10-73% by weight of A?2O3, and 1.5-6.5% by weight of K2O and/or Na2O. The porcelain has a total degree of crystallinity of more than 40% by weight, and a crystalline grain size of not greater than 20 µm, and it is free from defects of larger than 40 µm. The porcelain 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 µm, 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 µm, forming, drying, and firing at 1,000-1,400°C.
499098
Ngk Insulators Ltd.
Smart & Biggar
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