Black ceramic sinter with low thermal expansion and high...

Details Black ceramic sinter with low thermal expansion and high... Black ceramic sinter with low thermal expansion and high...

2006-06-27

2006-06-27

Vincent, Sean (Department: 1731)

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Involving specified composition of heating atmosphere, other...

C501S065000, C501S055000, C501S118000

Reexamination Certificate

active

07067085

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.

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Data Base WPI Abstract of Japan No. 61-178038 published Aug. 9, 1986.

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