Borosilicate glass composition
US5219801A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1992 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Mar 5, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/905
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A borosilicate glass composition consisting essentially of the following components: ______________________________________ SiO.sub.2 57-77 mol %, Al.sub.2 O.sub.3 0-8.5 mol %, B.sub.2 O.sub.3 4.6-23.0 mol %, ______________________________________ the total amount of SiO.sub.2 +Al.sub.2 O.sub.3 +B.sub.2 O.sub.3 being from 81 to 91 mol %, ______________________________________ Li.sub.2 O 0-1.5 mol %, Na.sub.2 O 2-7.5 mol %, K.sub.2 O 2-7.5 mol %, ______________________________________ the total amount of Li.sub.2 O+Na.sub.2 O+K.sub.2 O being from 7.6 to 10.6 mol %, ______________________________________ CeO.sub.2 0.7-2.0 mol %, Sb.sub.2 O.sub.3 0-0.3 mol %, As.sub.2 O.sub.3 0-0.3 mol %, TiO.sub.2 0-2.0 mol %, F.sub.2 0-2.0 mol %, ______________________________________ and one or more of MgO, CaO, SrO, BaO, ZnO and PbO, in a total amount of from 0 to 7 mol %; the glass composition having a coefficient of linear expansion within the range 64.0-70.0.times.10.sup.-7 /deg.C. These glass compositions are intended for use in making protective covers for gallium arsenide solar cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.