High thermal expansion, sealing glass
A glass composition is described for hermetically sealing to high thermal expansion materials such as aluminum alloys, stainless steels, copper, and copper/beryllium alloys, which includes between about 10 and about 25 mole percent Na[sub 2]O, between about 10 and about 25 mole percent K[sub 2]O, between about 5 and about 15 mole percent Al[sub 2]O[sub 3], between about 35 and about 50 mole percent P[sub 2]O[sub 5] and between about 5 and about 15 mole percent of one of PbO, BaO, and mixtures thereof. The composition, which may also include between 0 and about 5 mole percent Fe[sub 2]O[sub 3] and between 0 and about 10 mole percent B[sub 2]O[sub 3], has a thermal expansion coefficient in a range of between about 160 and 210[times]10[sup [minus]7]/C and a dissolution rate in a range of between about 2[times]10[sup [minus]7] and 2[times]10[sup [minus]9]g/cm[sup 2]-min. This composition is suitable to hermetically seal to metallic electrical components which will be subjected to humid environments over an extended period of time.
- DOE Contract Number:
- AC04-76DP00789
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5262364; A
- Application Number:
- PPN: US 7-764254
- OSTI ID:
- 5242734
- Resource Relation:
- Patent File Date: 23 Sep 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
GLASS
CHEMICAL COMPOSITION
SOLUBILITY
THERMAL EXPANSION
SEALING MATERIALS
ALUMINIUM OXIDES
BARIUM OXIDES
BORON OXIDES
IRON OXIDES
LEAD OXIDES
METALS
PHOSPHORUS OXIDES
POTASSIUM OXIDES
SEALS
SODIUM OXIDES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
BORON COMPOUNDS
CHALCOGENIDES
ELEMENTS
EXPANSION
IRON COMPOUNDS
LEAD COMPOUNDS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
360606 - Other Materials- Physical Properties- (1992-)