| 摘要 |
The invention is directed to a glass-ceramic seal, said seal comprising a boron-free, zinc-free glass-ceramic. The seals have a coefficient of thermal expansion in the range of 70-130 x 10 -7 °C, preferably 85-115 x 10- 7 °C. The glass-ceramic materials have a crystalline component and a glass component, the crystalline component being >50% of the glass-ceramic and the glass component being <50%. Regarding the crystalline component only, >50% of the crystals in the crystalline component of the glass-ceramic has a structure selected from the structural groups represented by kalsilite, kaliophilite and wollastonite (the primary crystalline phase) and the remaining <50% of the crystalline component is at least one secondary crystalline phase having a structure selected from the structural groups represented by akermanite, hardystonite, corundum, gehlenite, anorthite, wollastonite, diopside, enstatite and forsterite. Generally, the glass-ceramics of the invention are useful as metal-to-metal, metal-to-ceramic and ceramic-to-ceramic sealing agents. |
