Cordierite-based sintered body
US8242039B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 2010 |
| Grant date | Aug 14, 2012 |
| Priority date | — |
| Expiry date | Dec 5, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/963
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention is intended to drastically improve a precision polishing characteristic of a cordierite-based sintered body which has low thermal expansibility, high dimensional long-term stability and high rigidity (high elastic modulus). The cordierite-based sintered body comprises cordierite as primary components, and one or more selected from the group consisting of La, Ce, Sm, Gd, Dy, Er, Yb and Y in an oxide-equivalent amount of 1 to 8 mass %, without any crystal phase other than a cordierite crystal phase. A mass ratio of primary components of the cordierite satisfies the following relations: 3.85≦SiO2/MgO≦4.60, and 2.50≦Al2O3/MgO≦2.70, and the cordierite-based sintered body after being subjected to precision polishing has a precisely polished surface with an average surface roughness (Ra) of 1 nm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.