Process for the elimination of dimensional changes in ceramic g

Details Process for the elimination of dimensional changes in ceramic g Process for the elimination of dimensional changes in ceramic g

1974-07-15

1976-04-27

Douglas, Winston A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 83, 264343, 260 4211, C04B 3564

Patent

active

039535622

ABSTRACT:
Ceramic substrates used in the fabrication of electrical components are generally formed by casting a composition comprising ceramic, binder, solvent and optional wetting agent onto a support, removing the casting composition solvent to yield a ceramic green sheet and firing the ceramic green sheet at elevated temperatures. In such a process, internal stresses are generated in the ceramic green sheet after casting compositions solvent evaporation, which stresses cause dimensional changes in the ceramic green sheet with the passage of time and adversely effect critical component tolerances. The present invention provides a process for stabilizing ceramic green sheets against dimensional changes, which occur with the passage of time and/or upon screening the ceramic green sheet with metallurgical patterns, by contacting the ceramic green sheet, after casting composition solvent removal, with a solvent which softens the binder in the ceramic green sheet and permits stress relieving.

REFERENCES:
patent: 2886530 (1959-05-01), Greger
patent: 3042618 (1962-07-01), Brownlow
patent: 3109817 (1963-11-01), Miller
patent: 3287478 (1966-11-01), Pallen
patent: 3423216 (1969-01-01), Somers
patent: 3574029 (1971-04-01), Ettre
patent: 3631131 (1971-12-01), Kopko

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