β-spodumene glass-ceramics that are white, opalescent, or opaque, with low titanium content, and tin-fined
US11401202B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2018 |
| Grant date | Aug 2, 2022 |
| Priority date | — |
| Expiry date | Jul 19, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2204/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present application relates to glass-ceramics that are white, opalescent or opaque, of the lithium aluminosilicate (LAS) type, containing a solid solution of β-spodumene as the main crystalline phase. The application also provides articles that are constituted, at least in part, of said glass-ceramics, precursor glasses for said glass-ceramics, and a method of preparing said article. Said glass-ceramics have a composition that is free from arsenic oxide and antimony oxide, with the exception of inevitable traces, and that contains the following, expressed as percentages by weight of oxides: 60% to 70% of SiO2, 18% to 23% of Al2O3, 3.0% to 4.3% of Li2O, 0 to 2% of MgO, 1 to 4% of ZnO, 0 to 4% of BaO, 0 to 4% of SrO, 0 to 2% of CaO, 1.3% to 1.75% of TiO2, 1% to 2% of ZrO2, 0.05% to 0.6% of SnO2, 0 to 2% of Na2O, 0 to 2% of K2O, 0 to 2% of P2O5, 0 to 2% of B2O3, with Na2O+K2O+BaO+SrO+CaO≤6% and Na2O+K2O≤2%, and a maximum of 500 ppm of Fe2O3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.