Ceramics having negative coefficient of thermal expansion, method of making such ceramics, and parts made from such ceramics
US6066585A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1998 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | May 18, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/19
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A ceramic material in the lithium aluminosilicate (LAS) system, having a negative coefficient of thermal expansion and improved mechanical properties, the material having a stoichiometric composition of Li.sub.1+X AlSiO.sub.4+X/2, where 0.ltoreq.x.ltoreq.0.1. The ceramic material can be made by mixing silicon and aluminum oxides (SiO.sub.2 and Al.sub.2 O.sub.5) with lithium carbonate (Li.sub.2 CO.sub.3) and calcining the mixture. Alternatively, the ceramic material can be made by mixing silicon oxide (SiO.sub.2), lithium aluminate (LiAlO.sub.2), and, if desired, lithium carbonate (Li.sub.2 CO.sub.3), and calcining the mixture. Alternatively, the ceramic material can be made by mixing spodumene (an inexpensive mineral with a nominal composition of LiAlSi.sub.2 O.sub.6), lithium aluminate (LiAlO.sub.2), and the required amounts of other constituents (Li.sub.2 CO.sub.3, Al.sub.2 O.sub.3, or SiO.sub.2), and calcining the mixture. Alternatively, the ceramic material can be made by mixing spodumene (nominally LiAlSi.sub.2 O.sub.6) and the required amounts of other constituents (Li.sub.2 CO.sub.3, Al.sub.2 O.sub.3, or SiO.sub.2), and calcining the mixture. The ceramics of this invention e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.