Crystallizable solder glass used for e.g. fuel cell, comprises sintered ceramic containing strontium oxide, barium oxide, silica, alumina, boron oxide, cesium oxide, specific metallic oxide, lithium oxide, sodium oxide and potassium oxide

摘要

A crystallizable solder glass has thermal expansion coefficient of 8x 10 ->6>/K or more at 20-300[deg] C and sinter-start temperature in amorphous state of 750[deg] C or more. The crystallizable solder glass comprises sintered ceramic having sinter-start temperature of 1250[deg] C or more and containing (in wt.%) strontium oxide (40-58), barium oxide (less than 1), silica (25-60), alumina (less than 10), boron oxide (less than 0.5), cesium oxide (0-5), metallic (R) oxide (0-30), dimetallic (R) trioxide (0-40),metallic (R) dioxide (0-30) and lithium oxide, sodium oxide and potassium oxide (less than 1). A crystallizable solder glass has thermal expansion coefficient of 8x 10 ->6>/K or more at 20-300[deg] C and sinter-start temperature in amorphous state of 750[deg] C or more. The crystallizable solder glass comprises sintered ceramic having sinter-start temperature of 1250[deg] C or more and containing (in wt.%) strontium oxide (40-58), barium oxide (less than 1), silica (25-60), alumina (less than 10), boron oxide (less than 0.5), cesium oxide (0-5), metallic (R) oxide (0-30), dimetallic (R) trioxide (0-40), metallic (R) dioxide (0-30) and lithium oxide, sodium oxide and potassium oxide (less than 1). The metallic (R) oxide is alkaline-earth metal oxide chosen from magnesium oxide, calcium oxide, zinc oxide and beryllium oxide. The dimetallic (R) trioxide is gallium (III) oxide, indium trioxide, yttrium trioxide, lanthanum oxide and/or dysprosium oxide. The metallic (R) dioxide is titania, zinc-tin oxide and/or hafnium oxide.