Anorthite glass-ceramics

Details Anorthite glass-ceramics Anorthite glass-ceramics

1978-09-01

1980-02-05

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Marking

65 33, 106 52, 106 53, C03C 322

Patent

active

041871154

ABSTRACT:
The instant invention is related to the production of highly refractory glass-ceramic articles having moderate coefficients of thermal expansion in the CaO-Al.sub.2 O.sub.3 -SiO.sub.2 -TiO.sub.2 field wherein anorthite comprises the predominant crystal phase with a minor amount of rutile also being present. The articles demonstrate very high D.C. volume resistivities and high dielectric constants with exceptionally low loss tangents and dielectric loss factors. Their refractoriness and moderate expansion suggests an application such as kiln furniture where high temperatures, but not severe temperature changes, are encountered. Their high D.C. resistivities and low A.C. dielectric losses suggest their utility as insulators and electronic substrate materials.

REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 3677728 (1972-07-01), Kitaigorodosky
patent: 3772041 (1973-11-01), Tochon
patent: 3950174 (1976-04-01), Suzuki et al.

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