Patent ID: 7067085
Filing Date: 2006-06-27
Classification: C04B

Abstract:
1. A method for the production of a black low thermal expansion high specific rigidity ceramic sintered body, comprising: forming the sintered body in an atmosphere of a non-oxidizing gas at a temperature in the range of 1200–1500° C., said black low thermal expansion high specific rigidity ceramic sintered body, comprising: having a thermal expansion coefficient of not more than 0.6×10 a modulus of elasticity (Young's modulus) of not less than 100 GPa, a specific rigidity (Young's modulus/specific gravity) of not less than 40 GPa·cm assuming a black tone, said black low thermal expansion high specific rigidity ceramic sintered body having a chemical composition comprising: 8.0–17.2 mass % of MgO, 22.0–38.0 mass % of Al 49.5–65.0 mass % of SiO a total of 0.1–2 mass % of one or more transition elements as reduced to oxides, 0–2.5 mass % of Li having the mass ratios satisfy the relationships of (SiO