Method of forming a glass-reacted-ceramic with cadmium

Details Method of forming a glass-reacted-ceramic with cadmium Method of forming a glass-reacted-ceramic with cadmium

1976-11-01

1978-01-03

Bashore, S. Leon

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 30R, 65 32, 106 733, 106 7331, 106 46, 106 398, 264 61, 264 65, 65 59R, C03C 2100

Patent

active

040664260

ABSTRACT:
A method for forming a cadmium-containing glass-reacted-ceramic body is described. This material is advantageously employed as the dielectric material in a capacitor. The method comprises mixing a barium-titanate alkaline-earth-metal-zirconate powder with glass powder, forming a cake or layer of the powder mix and firing the cake at from 1600.degree. to 2050.degree. F in a controlled cadmium containing atmosphere to sinter and densify the material. The cake is buried in an inert powder to which has been added a cadmium oxide powder to supply a source of cadmium external of the cake and to control the cadmium containing atmosphere during firing. Cadmium ions diffuse, during sintering, into the glass and further, into the ceramic grains to promote grain growth and to downwardly shift the Curie temperature.

REFERENCES:
patent: 2789061 (1957-04-01), Coffeen
patent: 3529978 (1970-09-01), Taylor et al.
patent: 3619220 (1971-11-01), Maher
patent: 3885941 (1975-05-01), Maher
patent: 4017291 (1977-04-01), Gliemeruth et al.

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