| 摘要 |
PURPOSE:To restrain Ag from being diffused and to execute a sintering operation at a low temperature of 800 to 1000 deg.C by a method wherein a glass powder in a specific composition range is mixed with an alumina powder of a specific amount and this mixture is sintered. CONSTITUTION:A mixture of an alumina powder and a glass powder is used; the amount of the glass powder in the mixture is set to 35 to 65wt.%; a glass composition in terms of wt.% is set within ranges Al2O3 at 3 to 15, PbO at 40 to 52, Si2O at 32 to 40 and B2O3 at 2 to 8. When the ratio of the amount of the glass powder to the amount of the mixture of the alumina powder and the glass powder is less than 35wt.%, a sintering temperature becomes high. When the ratio exceeds 65wt.%, the quality as a substrate such as a strength, a moistureproof property and the like of a sintered body degrades. When the composition of the glass powder is set outside a specific range, this has a bad influence on a glass softening temperature; when Al2O3 is 3wt.% or lower, an effect of a waterproof property does not become remarkable. Thereby, it is possible to restrain Ag from being diffused so as to be negligibly small; a sintering operation can be executed sufficiently at a low temperature of 800 to 1000 deg.C. |
