Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-08-02
1988-08-02
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428325, 428210, 428432, 428901, B32B 300
Patent
active
047613254
ABSTRACT:
A method for producing a multilayer ceramic circuit board including the steps of forming a multilayer structure consisting of patterns of copper-based paste and glass-ceramic layers, the glass-ceramic layers consisting of a mixture of 10 percent to 75 percent by weight of .alpha.-alumina, 20 percent to 60 percent by weight of crystallizable or noncrystallizable glass which can be sintered at a temperature lower than the melting point of copper, and 5 percent to 70 percent by weight of quartz glass, based on the total weight of the glass-ceramic, blended with a binder containing a thermally depolymerizable resin; prefiring the multilayer structure in an inert atmosphere containing water vapor, the partial pressure of which is 0.005 to 0.3 atmosphere, at a temperature where the thermally depolymerizable resin is eliminated; and firing the multilayer structure in an inert atmosphere containing no water vapor at a temperature below the melting point of copper so as to sinter the glass-ceramic.
REFERENCES:
patent: 4234367 (1980-11-01), Herron et al.
patent: 4465727 (1984-08-01), Fujita et al.
patent: 4490429 (1984-12-01), Tosaki et al.
patent: 4504339 (1985-03-01), Kamehara et al.
patent: 4536435 (1985-08-01), Utsumi et al.
patent: 4609582 (1986-09-01), Joormann et al.
Imanaka Yoshihiko
Kamehara Nobuo
Kurihara Kazuaki
Niwa Koichi
Ogawa Hiromi
Fujitsu Limited
Swisher Nancy A. B.
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