Aluminum borate devitrification inhibitor in low dielectric borosilicate glass

摘要

A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 5.5 and a TCE of less than about 3. 5 ppm/°C. The composition comprises a mixture of finely divided particles of 20-80 vol. % borosilicate glass and 20-80 vol. % of Al.sub.x B.sub.y O.sub.z wherein x is in the range of 4 to 22, y is in the range of 2 to 5, and z is in the range of 9 to 36. The Al.sub.x B.sub. y O.sub.z inhibits the formation of crystalline forms of silica. The composition can be used 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.