Silica bricks and method for manufacturing silica bricks

Details Silica bricks and method for manufacturing silica bricks Silica bricks and method for manufacturing silica bricks

1978-08-16

1980-01-15

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 44, 106 735, C04B 3514, C04B 3556, C04B 3558

Patent

active

041837614

ABSTRACT:
Present invention provides silica bricks of improved thermal conductivity and low gas permeability and method for manufacturing such silica bricks. The manufacturing method is substantially characterized in that siliceous raw mixture includes 0.5 to 10 percent by weight of nitride or carbide of metallic silicon and that, in the firing process from 1200.degree. to 1400.degree. C., the temperature elevation speed and the oxygen concentration at the exhaust port of the firing furnace take specific rates respectively different from the corresponding rates of conventional firing. In the above firing process, the nitride or carbide of metallic silicon is oxidized to form SiO.sub.2 and this SiO.sub.2 fills in pores of the matrix whereby silica bricks produced by the method of this invention can have high thermal conductivity and low gas permeability.

REFERENCES:
patent: 3215547 (1965-11-01), Parr
patent: 3236665 (1966-02-01), King
patent: 3681113 (1972-08-01), Yoldas
patent: 3684538 (1972-08-01), Wright

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