Gallium crystal growth inhibitor for glassy low dielectric inorganic composition
AssigneeAluminum Company of America
InventorsJau-Ho Jean, Tapan K. Gupta
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Abstract
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.5 and a TCE of less than about 4.0 ppm/c. The composition comprises a mixture of 20-50 wt. % borosilicate glass 40-75 wt. % of a glass selected from the group consisting of glass containing 95-98 wt. % silica, titanium silicate glass and combinations thereof and sufficient amounts of gallium to inhibit the formation of crystalline forms of silica. The composition can be combined with a polymeric binder to produce an unfired green tape which is co-fireable with high conductivity metallurgies such as gold, silver and silver/palladium.
Claims13
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.5, said composition formed from a mixture comprising:
- (a) 20-50 wt. % wt. % of a low temperature glass selected from the group consisting of borosilicate glass, zinc borate glass and combinations thereof;
- 40-75 wt. % of a glass selected from the group consisting of glass containing 95-98 wt. % silica, titanium silicate glass and combinations thereof;
- and
- (c) sufficient amounts of a gallium-containing material to inhibit the formation of crystalline forms of silica.
A castable ceramic composition comprising:
- (a) 70-85 wt. % of a mixture of comprising:
- 20-50 wt. % borosilicate glass;
- 40-75 wt. % of a glass selected from the group consisting of glass containing 95-98 wt. % silica, titanium silicate glass and combinations thereof;
- and
- 0.1-40 wt. % of a gallium compound;
- and
- (b) 15-30 wt. % of an organic medium comprised of a polymeric binder dissolved in an organic solvent.
A method of making a ceramic dielectric body having a dielectric constant of less than about 4.5, comprising the steps of:
- (a) providing a mixture comprising:
- 20-50 wt. % borosilicate glass;
- 40-75 wt. % of a glass selected from the group consisting of glass containing 95-98 wt. % silica, titanium silicate glass and combinations thereof;
- and
- 0.1-40 wt. % of a gallium compound;
- and
- (b) sintering the mixture in air to a temperature not greater than about 1000.degree. C. to form a ceramic body having less than 1 wt. % crystalline silica.
Dependencies are inferred from the claim text.