Casting of reactive metals into ceramic molds
AssigneeRemet Corporation
InventorRoy C. Feagin
Life of this patent
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Abstract
Mold coatings that are relatively unreactive with titanium and titanium alloys during casting are prepared from zirconia or yttria sols, or mixtures thereof as a binder for a refractory such as zirconium oxide, yttrium oxide and mixtures thereof.
Claims12
A composition comprising:
- zirconia sol as a binder, and a sufficient amount of a refractory material selected from the group consisting of:
- fused yttrium oxide, a fused mixture of yttrium oxide and zirconium oxide,
- a fused blend of zirconium oxide and yttrium oxide with an oxide of rare earth elements of the Periodic Table elements with an atomic member of 57-71;
- a fused blend of zirconium oxide with an oxide of rare earth elements of the Periodic Table of elements with an atomic number of 57-71;
- and a fused blend of yttrium oxide with an oxide of rare earth elements of the Periodic Table of elements with an atomic number of 57-71.
A coating made from a composition comprising a zirconia sol as a binder, and a sufficient amount of a refractory material selected from the group consisting of:
- fused yttrium oxide, a fused mixture of yttrium oxide and zirconium oxide,
- a fused blend of zirconium oxide and yttrium oxide with an oxide of rare earth elements of the Periodic Table elements with an atomic number of 57-71;
- a fused blend of zirconium oxide with an oxide of rare earth elements of the Periodic Table of elements with an atomic number of 57-71;
- and a fused blend of yttrium oxide with an oxide of rare earth elements of the Periodic Table of elements with an atomic number of 57-71.
A refracatory shaped article made from a composition comprising zirconia sol as a binder and a sufficient amount of a refractory material selected from the group consisting of:
- fused yttrium oxide, a fused mixture of yttrium oxide and zirconium oxide,
- a fused blend of zirconium oxide and yttrium oxide with an oxide of rare earth elements of the Periodic Table elements with an atomic number of 57-71;
- a fused blend of zirconium oxide with an oxide of rare earth elements of the Periodic Table of elements with an atomic number of 57-71;
- and a fused blend of yttrium oxide with an oxide of rare earth elements of the Periodic Table of elements with an atomic number of 57-71.
A process for making a ceramic core comprising coating the inside of a core mold with a slurry comprising:
- zirconia sol and a refractory material selected from the group consisting of yttrium oxide, fused yttrium oxide, a fused mixture of yttrium oxide and zirconium oxide, and a fused blend of zirconium and/or yttrium oxide with an oxide of a rare earth element of the Periodic Table of elements with an atomic number of 57 to 71, to thereby obtain a core mold with a coating on its inside,
- applying thereto finely divided refractory and permitting the coating to dry, thereafter applying to the coating a mixture of a refractory and a binder therefor, removing the core from the mold and firing said core at a sufficiently high temperature to bond the coating and the refractory.
Dependencies are inferred from the claim text.