Glass-ceramic with specific thermal expansion behavior
US4851372A · kind A · utility
23Cited by
5References
23Claims
0Family size
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Key dates
| Filing date | Nov 19, 1986 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Nov 19, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C10/0027
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Base-glasses for glass ceramics cotaining h-quartz solid solution crystals, with a maximum relative length variation of 1.times.10.sup.-5 and a linear thermal expansion coefficient less than 0.1.times.10.sup.-6 /K, comprise (in weight percent) 50-65 SiO.sub.2, 18-27 Al.sub.2 O.sub.3, 0-10 P.sub.2 O.sub.5,0-1 B.sub.2 O.sub.3, 2.5-4 Li.sub.2 O, 0-2 Na.sub.2 O, 0-2 K.sub.2 O, 0-0.5 MgO, 1-5 ZnO, 1-4 CaO, 1-5 BaO, 0-5 TiO.sub.2, 0-3 ZrO.sub.2 and 0-1.5 As.sub.2 O.sub.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.