| 摘要 |
Ceramic materials particularly adapted to be sealed to glass and/or metal to form hermetic seals in electrical apparatus are prepared by fixing at form 1370 DEG to 1400 DEG C. a mixture of 45-75 (preferably 45-55) parts of zirconium silicate, 15-30 (preferably 22-30) parts of magnesium silicate, 4-12 (preferably 4-5) parts of aluminium silicate, 1-10 (preferably 8-10) parts of zirconia, 4-7 (preferably 6-7) parts of barium carbonate, and 1-3 parts of calcium-magnesium-aluminium borosilicate glass, e.g. the glass described in Specification 582,799.
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