Crystallized glass sealing material
AssigneeNihon Yamamura Glass Co., Ltd.
InventorKozo MAEDA
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Abstract
Disclosed is a sealing glass composition that turns, when fired at a temperature of 900-1150 ° C., into a crystallized glass having a thermal expansion coefficient of 80-110×10−7/° C. in the range of 50-850° C. The composition is substantially free of both boron oxide and barium oxide, and comprises SiO2: 43-53 mol %, CaO: 12-33 mol %, MgO: 12-33 mol %, La2O3: 1-7 mol %, and ZnO: 0-4.5 mol %.
Claims13
A sealing glass composition substantially free of both boron oxide and barium oxide, comprising
- SiO2
- 43-53
- mol %,
- CaO
- 12-33
- mol %,
- MgO
- 12-33
- mol %,
- La2O3
- 1-7
- mol %, and
- ZnO
- 0-4.5
- mol %,
- wherein the composition turns, when fired at a temperature of 900-1150° C., into a crystallized glass having a thermal expansion coefficient of 80-110×10−7/° C. at a temperature in the range of 50-850° C.
A method of producing a sealing glass composition, wherein the composition turns, when fired in the form of powder at a temperature of 900-1150° C., into a crystallized glass exhibiting a thermal expansion coefficient of 80-110×10−7° C. at a temperature in the range of 50-850° C.,
- wherein the method comprises the steps of providing and mixing raw materials so that composition is substantially free of both boron oxide and barium oxide, and comprises
- SiO2
- 43-53
- mol %,
- CaO
- 12-33
- mol %,
- MgO
- 12-33
- mol %,
- La2O3
- 1-7
- mol %, and
- ZnO
- 0-4.5
- mol %, and
- heating the raw materials into a melt, and cooling the melt to let the melt solidify.
Dependencies are inferred from the claim text.