| 摘要 |
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 Al<SUB>2</SUB>O<SUB>3</SUB>, 49.5-65.0 mass % of SiO<SUB>2</SUB>, a total of 0.1-2 mass % of one or more transition elements as reduced to oxides, and 0-2.5 mass % of Li<SUB>2</SUB>O, and having the mass ratios satisfy the relationships of (SiO<SUB>2</SUB>-8xLi<SUB>2</SUB>O)/MgO>=3.0 and (SiO<SUB>2</SUB>-8xLi<SUB>2</SUB>O)/Al<SUB>2</SUB>O<SUB>3</SUB>>=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.
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