The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 1980
Filed:
Oct. 04, 1976
Hal H Rice, Birmingham, MI (US);
General Motors Corporation, Detroit, MI (US);
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.