Claims
- 1. A method of selectively increasing the dielectric constant of glass-ceramic comprising:adding to a cordierite-based powdered glass-ceramic between 5-15% by volume of powdered high dielectric constant additive material selected from among BaTiO3, SrTiO3, Ta2O5, SiC and Cu; mixing said glass-ceramic powder and high dielectric constant additive material powder to a homogenous mixture; forming parts from said homogenous mixture; and firing said parts at temperatures between 850° C. and 1000° C.
- 2. The method as set forth in claim 1 wherein said homogenous mixture is combined with organic solvents and binders to form a slurry and said parts are formed by casting said slurry into greensheets before firing.
- 3. The method as set forth in claim 2 wherein greensheets with different concentrations of additive material are combined before firing to form different dielectric constant structures within the same electronic package.
- 4. The method as set forth in claim 2 wherein metal paste is screened on said greensheet before firing so that the greensheet and metal paste are cofired.
- 5. The method as set forth in claim 3 wherein metal paste is screened on at least one of said greensheets before said greensheets with different concentrations are combined for firing so that said greensheets and metal paste are cofired.
- 6. A method of selectively increasing the dielectric constant of glass-ceramic and maintaining low loss tangents over a range of frequencies, comprising:adding about 5-15 by volume percent of powdered high dielectric additive material selected from among BaTiO3, SrTiO3 and Ta2O5 to a cordierite-based powered glass-ceramic material; mixing said powdered additive material with said powdered glass-ceramic material to a homogenous mixture; forming parts from said homogenous mixture; firing said parts at temperatures between approximately 850° C. and 1000° C.
- 7. The method as set forth in claim 6 wherein said cordierite-based glass-ceramic material comprises approximately 55 weight percent SiO2, 21 weight percent Al2O3, 22 weight percent MgO, 0.03 weight percent P2O5 and 1.3 weight percent B2O3.
- 8. A method of selectively increasing the dielectric constant of glass-ceramic and maintaining low loss tangents over a range of frequencies, comprising:adding about 5-15 by volume percent of powdered high dielectric additive material selected from among BaTiO3, SrTiO3, Ta2O5, SiC and Cu to a cordierite-based powdered glass-ceramic material; mixing said powdered additive material with said powdered glass-ceramic material to a homogenous mixture; forming parts from said homogenous mixture; and firing said parts at temperatures between approximately 850° C. and 1000° C.
Parent Case Info
The present invention is a divisional application related to a U.S. patent application Ser. No. 09/364,844, filed Jul. 30, 1999, now U.S. Pat. No. 6,171,988.
US Referenced Citations (19)
Non-Patent Literature Citations (2)
Entry |
Abstract of JP 06128028A, Aug. 2000.* |
Abstract of JP 407187766, Jul. 1995. |