Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1986-10-27
1987-12-22
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 5, 501 69, 501 73, C03C 1004, C03C 1008, C03C 3085, C03C 3062
Patent
active
047146877
ABSTRACT:
This invention is directed to the production of glass-ceramic materials especially designed for substrates in integrated circuit packaging. The glass-ceramics can be prepared from thermally crystallizable glasses that can be sintered into an integral glass-ceramic having a dielectric constant less than 6 and containing willemite as the predominant crystal phase. The overall composition of the glass-ceramic consists essentially, in weight percent of 15-45% ZnO, 10-30% Al.sub.2 O.sub.3, and 30-55% SiO.sub.2. Where desired, a nucleating agent selected from the group consisting of 8-12% ZrO.sub.2 and 0.001-0.05% of a noble metal selected from the group consisting of Au, Pd, and Pt may be included.
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Holleran Louis M.
Martin Francis W.
Bell Mark L.
Corning Glass Works
Janes, Jr. C. S.
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