| 摘要 |
The glass of the glass-metal bond contains the following ingredients in the following amounts: SiO2, 72-80 wt %; B2O3, 4-<6 wt %; Al2O3, 2-5 wt %; Na2O, 4-7 wt %; K2O, 0-3 wt %; CaO, 2.5-8 wt %; MgO, 0-2 wt %; BaO, 0-4 wt %; TiO2, 0-5 wt %; CeO2, 0-2 wt %; Fe2O3, 0-0.1 wt %; F, 0-2 wt %; and the ratio of the sum total amount of Al2O3 and B2O3 (in mol %) to the sum total amount of MgO, CaO and BaO (in mol %) in the glass is less than 5. The glass-metal bond advantageously includes a KOVAR® alloy and the glass of the aforesaid composition and connects the glass envelope tube with an inner metal absorber tube in a tube collector.
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