Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1991-10-18
1993-04-20
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 7, 501 8, 501 9, 501 32, 501 39, 501 61, 501 65, 501 67, 501 75, 428450, 428469, C03C 416, C03C 3089, C03C 1006
Patent
active
052042898
ABSTRACT:
This invention provides a composite article comprising mullite bubbles dispersed in one of a glass matrix and a glass-ceramic matrix, and a method of making the same. The composite ceramic article of the present invention is useful in applications requiring a material having a low dielectric constant, low dissipation factor, thermal expansion properties compatible with silicon, and good mechanical strength. The composite ceramic article of the present invention is particularly useful as a substrate for thick film circuits, housings for integrated circuit assemblies (i.e., covers), and materials such as gyrotron windows, that require transparency to microwaves or millimeter waves, in addition to acceptable power transmission efficiencies.
REFERENCES:
patent: 4752531 (1988-06-01), Steinberg
patent: 4867935 (1989-09-01), Morrison, Jr.
patent: 4994302 (1991-02-01), Kellerman
patent: 5077241 (1991-12-01), Moh et al.
patent: 5108958 (1992-04-01), Moh et al.
"Low Firing Temperature Multilayer Glass-Ceramic Substrate, " IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. 6, (4), Dec. 1983, pp. 382-386.
"Hollow glass microsphere composites: preparation and properties, " Journal of Materials Science, 20, (1985), 1069-1078.
Allen Gregory D.
Griswold Gary L.
Group Karl
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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