Process for manufacture of castings of reactive metals

Details Process for manufacture of castings of reactive metals Process for manufacture of castings of reactive metals

1995-06-02

1997-05-06

Lin, K. Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164114, 164138, 164529, 249135, 106 3827, 106 389, B22C 100, B22C 300

Patent

active

056261799

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.

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patent: 3268963 (1966-08-01), Mann
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patent: 3420291 (1969-01-01), Chandley et al.
patent: 3990498 (1976-11-01), Dompas et al.
patent: 4240494 (1980-12-01), Kryanin et al.
patent: 5119865 (1992-06-01), Mae et al.

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