Process for production of vitreous ceramics and product thereof

Details Process for production of vitreous ceramics and product thereof Process for production of vitreous ceramics and product thereof

1987-09-11

1989-08-22

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 30, 501 43, 501 59, 501151, C03C 1016, C03C 606

Patent

active

048596345

ABSTRACT:
A complex oxide comprising zirconium oxide and an oxide of at least one metal selected from the group consisting of an alkali metals, alkaline earth metals, silicon and lead is mixed with pottery stone, magnesium fluoride, a compound capable of forming magnesium oxide, a compound capable of forming potassium oxide and a compound capable of forming boron oxide to obtain a composition in which the contents of elements in 100 parts by weight of the total amount exclusive of the ignition loss are 16 to 25 parts of silicon, 6 to 9 parts of aluminum, 5.5 to 12 parts of potassium, 4.7 to 15 parts of magnesium, 0.7 to 5.0 parts of zirconium, 0.7 to 3.2 parts of boron, 3.0 to 9.3 parts of fluorine, up to 7.0 parts of metals other than the foregoing elements, and the balance being oxygen. This composition is heat-melted and then cooled from a temperature higher at least 50.degree. C. than the glass transition temperature of a vitreous body to be formed to a temperature lower by at least 70.degree. C. lower than the transition temperature at a cooling speed lower than 100.degree. C. per hour, and the resulting vitreous body is heated-treated at a temperature of 1100.degree. to 1360.degree. C. in a closed vessel. According to this process, the crack ratio can be drastically reduced and the yield can be increased even when a large vitreous ceramic product is prepared, and the mechanical strength and machinability are highly improved in the obtained product.

REFERENCES:
patent: 3689293 (1972-09-01), Beall
patent: 3801295 (1974-04-01), Beall et al.

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