Low thermal expansion coefficient synthetic cordierite-containin

Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...

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106 46, 106 734, C04B 3520

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active

039792161

ABSTRACT:
Synthetic cordierite (2Mg0,2Al.sub. 2 O.sub. 3.5SiO.sub. 2) ceramic bodies exhibiting low thermal expansions are characterized by a microstructure containing less than 10 percent by volume glass and by microcracks of certain size and frequency of occurrence and may be produced, for example, by (1) dry ball milling talc, ball clay and alpha alumina in noncontaminating media, (2) consolidating the mixture to form a green body, (3) heating the green body at a rate of up to 150.degree.C per hour to a temperature within the range of 1350.degree. to 1425.degree.C, (4) holding the body at this temperature for a time of from 1/2 to 10 hours, and (5) cooling the body to below 1,000.degree.C at a rate of up to 150.degree.C per hour. Such bodies possess good to excellent thermal shock resistance, and chemical durability and are useful, for example, as components in gas turbine engines.

REFERENCES:
patent: 3288615 (1966-11-01), Estes et al.
patent: 3531307 (1970-09-01), Rubin et al.
patent: 3885977 (1975-05-01), Lachman et al.

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