Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1986-11-26
1989-05-30
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428209, 428428, 428432, 428901, 501 15, 501 17, 501 32, 106 105, B32B 300, C03C 814, C03C 824, B22F 700
Patent
active
048350397
ABSTRACT:
A tungsten paste suitable for co-sintering with 98+% alumina substrate can be produced by adding selected compositions of glass to the paste. Circuit packages produced in accordance with the present invention exhibit superior thermal conductivity, low shrinkage variability, and smoother and more homogeneous surface finish. A preferred embodiment of the invention utilizes a substrate comprising narrow size range alumina powder, thus yielding lower sintering temperature and further improvements in shrinkage variability and surface finish.
REFERENCES:
patent: 3993821 (1976-11-01), Goss
patent: 4404154 (1983-09-01), Arons et al.
patent: 4624896 (1986-11-01), Watanabe et al.
patent: 4678683 (1987-07-01), Pasco et al.
patent: 4734233 (1988-03-01), Toda et al.
Chem. Abs.: 104: 173209u (1986).
Chem. Abs.: 94: 196539r (1981).
Barringer Eric A.
Foster Brian C.
Hodge James D.
Lind Roger S.
Ceramics Process Systems Corporation
Robinson Ellis P.
Ruben Bradley N.
Ryan P. J.
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