Core for casting titanium and titanium alloy
AssigneesAgency of Industrial Science and Technology, Ministry of International Trade & Industry
InventorTakeshi Takayanagi
Life of this patent
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Abstract
A core for casting titanium or an alloy thereof consists essentially of a sintered formed substrate of a powder having as its main component either mullite powder alone or a combination of mullite powder and at least one member selected from among quartz glass, alumina, zircon, magnesia, and cristobalite and a surface layer formed of at least one member selected from among yttria, zirconia, hafnia, alumina, neodymium oxide, and samarium oxide and deposited as a coating layer on the surface of the formed substrate.
Claims20
A core for casting titanium or an alloy thereof, consisting essentially of
- (A) a sintered formed substrate, comprising
- (i) mullite;
- and
- (ii) 0.5-30% by weight, based on the amount of said mullite, of at least one sintering accelerator selected from the group consisting of quartz glass, alumina, zirconia, magnesia and cristobalite;
- and
- (B) a layer made of at least one oxide selected from the group consisting of yttria, zirconia, hafnia, alumina, neodymium oxide and samarium oxide;
- wherein said layer is on the surface of said substrate.
A core for casting titanium or an alloy thereof, comprising
- (A) a sintered formed substrate, comprising
- (i) mullite;
- and
- (ii) 0.5-30% by weight, based on the amount of said mullite, of a sintering accelerator comprising one member selected from the group consisting of quartz glass, alumina, zirconia, magnesia and cristobalite;
- and
- (B) a layer comprising one oxide selected from the group consisting of yttria zirconia, hafnia, alumina, neodymium oxide and samarium oxide;
- wherein said layer is on the surface of said substrate.
Dependencies are inferred from the claim text.