Cordierite-based ceramic(s) and member for a telescope
AssigneeKYOCERA Corporation
InventorsHiroshi Yoshimitsu, Shuzo Iwashita, Hirotsugu Nodake
Life of this patent
Estimating the term…
Abstract
A cordierite-based ceramic(s) is provided where a main crystalline phase thereof is a cordierite crystalline phase, a content of Mg is 13.2% by mass or more and 13.8% by mass or less in an MgO equivalent, a content of Al is 26.0% by mass or more and 32.1% by mass or less in an Al2O3 equivalent, a content of Bi is 1.6% by mass or more and 4.6% by mass or less in a Bi2O3 equivalent, a content of B is 1.5% by mass or more and 6.8% by mass or less in a B2O3 equivalent, and a content of Si is 49.4% by mass or more and 51.4% by mass or less in an SiO2 equivalent.
Claims12
A cordierite-based opaque ceramic, consisting of:
- a main crystalline phase thereof is a cordierite crystalline phase;
- a content of Mg is 13.2% by mass or more and 13.8% by mass or less in an MgO equivalent;
- a content of Al is 26.0% by mass or more and 32.1% by mass or less in an Al2O3 equivalent;
- a content of Bi is 1.6% by mass or more and 4.6% by mass or less in a B2O3 equivalent;
- a content of B is 1.5% by mass or more and 6.8% by mass or less in a B2O3 equivalent;
- a content of Si is 49.4% by mass or more and 51.4% by mass or less in an SiO2 equivalent;
- and
- a pseudo thermal expansion rate of a cordierite-based opaque ceramic is between 0.06 X 10−7/K and 2.19×10−7/K.
A cordierite-based opaque ceramic, consisting of:
- a main crystalline phase thereof is a cordierite crystalline phase;
- a content of Mg is 13.2% by mass or more and 13.8% by mass or less in an MgO equivalent;
- a content of Al is 26.0% by mass or more and 32.1% by mass or less in an Al2O3 equivalent;
- a content of Bi is 1.6% by mass or more and 4.6% by mass or less in a Bi2O3 equivalent;
- a content of B is 1.5% by mass or more and 6.8% by mass or less in a B2O3 equivalent;
- a content of Si is 49.4% by mass or more and 51.4% by mass or less in an SiO2 equivalent;
- and
- a pseudo thermal expansion rate of a cordierite-based opaque ceramic is between 0.06 X 10−7/K and 2.00× 10−7/K.
Dependencies are inferred from the claim text.