| 摘要 |
A sealing glass frit which is capable of stably joining metal members or ceramic members at temperatures thereof not higher than 1000° C., and at the same time stably maintaining the joined state of the members at temperatures ranging from room temperature to 700 or 800° C. A raw material in an amount of MG 300 g is prepared such that it has a composition of 40 to 70 mol % of SiO<SUB>2</SUB>, 5 to 20 mol % of Al<SUB>2</SUB>O<SUB>3</SUB>, 4 to 20 mol % of Na<SUB>2</SUB>O, 4 to 20 mol % of K<SUB>2</SUB>O, 5 to 20 mol % of ZnO, and 0.5 to 5 mol % of ZrO<SUB>2</SUB>, and the total content of Na<SUB>2</SUB>O and K<SUB>2</SUB>O is not lower than 12 mol %. The raw material is melted in a platinum crucible at 1550° C. for 8 hours, cast in a mold of stainless steel, held at 650° C. for 2 hours, and then cooled to room temperature at 5° C./minute. The cooled raw material is pulverized in a mortar to obtain powder having a particle diameter 10 to 20 mum as a sealing glass frit.
|
