Glass composition for sealing
AssigneeNihon Yamamura Glass Co., Ltd.
InventorsKozo Maeda, Yoshitaka Mayumi
Life of this patent
Estimating the term…
Abstract
Disclosed is a sealing glass composition substantially not containing B2O3 or Al2O3, which is a high-strength, high-expansive crystallizing glass composition that can be used at high temperatures of not less than 950° C. The composition substantially not containing boron oxide, alkali metal oxides or aluminum oxide, but containing, in mol %, SiO2: 40-55, BaO: 18-35, TiO2+ZrO2: 0.1-10, ZnO: 0-15, CaO: 0-20, MgO: 0-9, SrO: 0-5, and La2O3: 0-2, wherein the total content of RO (R: Mg, Ca, Sr, Ba and Zn) is at least 44 mol %, and wherein the glass composition, when fired in the form of glass powder at a temperature of 850-1050° C, turns into a crystallized glass that exhibits a thermal expansion coefficient of 90-150×10−7/° C. in the range of 50-850° C.
Claims11
A sealing glass composition substantially not containing boron oxide, alkali metal oxides and aluminum oxide, but containing, in mol %,
- SiO2
- 40-55
- BaO
- 18-35
- TiO2 + ZrO2
- 0.1-10
- ZnO
- 0-15
- CaO
- 0-20
- MgO
- 0-4.5
- SrO
- 0-5, and
- La2O3
- 0.1-2,
- wherein the total content of RO (R:
- Mg, Ca, Sr, Ba and Zn) is at least 44 mol %, and
- wherein the glass composition, when fired in a form of glass powder at a temperature of 850-1050° C., turns into a crystallized glass that exhibits a thermal expansion coefficient of 90-150×10−7/° C. in the range of 50-850° C.
Dependencies are inferred from the claim text.