Method for low pressure forming of fused silica compositions and

Details Method for low pressure forming of fused silica compositions and Method for low pressure forming of fused silica compositions and

1976-10-04

1980-09-09

Parrish, John A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

264 63, C04B 3514

Patent

active

042215960

ABSTRACT:
A method for forming contoured refractory bodies characterized by a low coefficient of expansion, high flexural strength and resistance to thermal shock, wherein a fused silica material is pressed into the desired shape in a porous die at a pressure not greater than about 1500 psi, the batch composition consisting essentially of from about 70-85 parts by weight fused silica of -325 mesh, from about 15-30 parts by weight clay, together with from about 20-28 parts by weight de-ionized water and from about 0.1-0.6 parts by weight of at least one of the organic plasticizers selected from the group consisting of hydroxyethyl cellulose, hydroxypropyl cellulose, ethylene oxide resin and propylene glycol alginate, the composition containing less than 0.3% by weight on an after-fired basis of alkali and alkaline earth metal oxides, the green body being dried and then fired at about 1123.degree. C. for about 6 hours.

REFERENCES:
patent: 3389001 (1968-06-01), Blackburn et al.
patent: 3770867 (1973-11-01), Criss et al.
patent: 3791835 (1974-02-01), Carini et al.
patent: 3963504 (1976-06-01), Lundsager
Scholes, Modern Glass Practice, pp. 251-255, 1951.

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