Black ceramic sinter with low thermal expansion and high specific rigidity and process for producing the same
US7067085B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2000 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Oct 10, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/64
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention provides a black low thermal expansion high specific rigidity ceramic sintered body having a black tone, manifesting very small thermal expansion at room temperature and abounding in rigidity and specific rigidity, and a method for the production thereof. The black low thermal expansion high specific rigidity ceramic sintered body is characterized by having a chemical composition comprising 8.0–17.2 mass % of MgO, 22.0–38.0 mass % of Al2O3, 49.5–65.0 mass % of SiO2, a total of 0.1–2 mass % of one or more transition elements as reduced to oxides, and 0–2.5 mass % of Li2O, and having the mass ratios satisfy the relationships of (SiO2−8×Li2O)/MgO≧3.0 and (SiO2−8×Li2O)/Al2O3≧1.2. The method for the production of a black low thermal expansion high specific rigidity ceramic sintered body of this invention is characterized by forming the sintered body in an atmosphere of a non-oxidizing gas at a temperature in the range of 1200–1500° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.