Bismuth-based glass composition, powder material, and powder material paste
A bismuth-based glass composition includes as a glass composition, in terms of mass %, 55% to 80% of Bi 2 O 3 , 15% to 35% of SiO 2 , 0% to less than 3% of ZrO 2 , 0% to 5% of B 2 O 3 , and 0% to less than 8% of ZnO, and has a mass ratio SiO 2 /ZrO 2 of more than 6.7.
1. A bismuth-based glass composition, comprising as a glass composition, in terms of mass %, 60% to 80% of Bi 2 O 3 , 15% to 35% of SiO 2 , 0.1% to less than 1% of ZrO 2 , 0% to 3% of B 2 O 3 , and 0% to less than 8% of ZnO, and having a mass ratio SiO 2 /ZrO 2 of greater than 15.
2. The bismuth-based glass composition according to claim 1 , further comprising 1 mass % to 9 mass % of BaO.
3. The bismuth-based glass composition according to claim 1 , further comprising 0.5 mass % to 5 mass % of Al 2 O 3 .
4. The bismuth-based glass composition according to claim 1 , wherein the bismuth-based glass composition has a content of MgO of 5 mass % or less, a content of CaO of 5 mass % or less, a content of SrO of 5 mass % or less, and a content of ZnO of 5 mass % or less.
5. The bismuth-based glass composition according to claim 1 , wherein the bismuth-based glass composition is substantially free of PbO.
6. A powder material, comprising:
a glass powder comprising the bismuth-based glass composition of claim 1 ; and
a ceramic powder,
wherein a content of the glass powder is from 50 mass % to 100 mass %, and a content of the ceramic powder is from 0 mass % to 50 mass %.
7. The powder material according to claim 6 , wherein the powder material has a softening point of 600° C. or less.
8. The powder material according to claim 6 , wherein the powder material is used for formation of an overcoat layer.
9. A powder material paste, comprising:
a powder material; and
a vehicle,
wherein the powder material comprises the powder material of claim 6 .
10. The powder material paste according to claim 9 , wherein the powder material paste is substantially free of a phthalic acid-based compound.
11. The powder material paste according to claim 9 , further comprising at least one compound selected from the group consisting of an adipic acid-based compound, a sebacic acid-based compound, and a citric acid-based compound.