Process for manufacture of castings of reactive metals
First Claim
1. Process for production of castings comprisingproviding a reusable casting mold having a surface which comes in contact with molten metal, said surface consisting of at least one metal selected from the group consisting of tantalum, tantalum alloys, niobium, niobium alloys, zirconium, and zirconium alloys, andcasting in said mold a melt of a reactive metal selected from the group consisting of titanium and titanium alloys.
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Accused Products
Abstract
In the production of castings from a melt of a reactive metal selected from the group consisting of titanium, titanium alloys, and titanium-based alloys, a reusable casting mold (20) is used; the mold, at least in the area of the surface which comes in contact with the melt, consists of at least one metal selected from the group consisting of tantalum, niobium, zirconium, and/or their alloys. The casting mold (20) preferably consists, at least in the area of the surface which comes in contact with the melt, of a tantalum based alloy containing at least 50 wt. % of tantalum. The casting molds can be made of a homogeneous metal, but it is also possible to insert shells of the metals in question into a base body to form the boundaries of the mold cavities, whereas the base body itself consists of some other metal or alloy or of a nonmetal such as graphite or silicon nitride. Insofar as the casting molds in question are molds for centrifugal casting, it is preferable to use titanium, a titanium alloy, or titanium aluminide as the nonmetal for the base body.
52 Citations
13 Claims
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1. Process for production of castings comprising
providing a reusable casting mold having a surface which comes in contact with molten metal, said surface consisting of at least one metal selected from the group consisting of tantalum, tantalum alloys, niobium, niobium alloys, zirconium, and zirconium alloys, and casting in said mold a melt of a reactive metal selected from the group consisting of titanium and titanium alloys.
Specification