The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 2006
Filed:
Jun. 01, 2000
Jun Sugawara, Kitakyushu, JP;
Hidehiko Morita, Tokyo, JP;
Katsumi Hashimoto, Toyko, JP;
Tetsuro Nose, Futtsu, JP;
Jun Sugawara, Kitakyushu, JP;
Hidehiko Morita, Tokyo, JP;
Katsumi Hashimoto, Toyko, JP;
Tetsuro Nose, Futtsu, JP;
Nippon Steel Corporation, Tokyo, JP;
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 AlO, 49.5–65.0 mass % of SiO, a total of 0.1–2 mass % of one or more transition elements as reduced to oxides, and 0–2.5 mass % of LiO, and having the mass ratios satisfy the relationships of (SiO−8×LiO)/MgO≧3.0 and (SiO−8×LiO)/AlO≧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.