Process for manufacture of cast parts made of reactive metals an

Details Process for manufacture of cast parts made of reactive metals an Process for manufacture of cast parts made of reactive metals an

1998-07-28

1999-09-14

Lin, Kuang Y.

Metal founding

Means to shape metallic material

Pressure shaping means

164138, 249135, B22C 300, B22D 1306

Patent

active

059507063

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.

REFERENCES:
patent: 3990498 (1976-11-01), Dompus et al.
patent: 5119865 (1992-06-01), Mae et al.
English translation of JP Kokai 02-92870.
Krone "Production and Properties of Precision Investment and compact castings in titanium alloys" Grisserei 65 (1978) No. 20 pp. 540-549.
Krone et al. "Titanium Investment Castings: Manufacture and Properties" APS International Cast Metals Journal, vol. 2, No.1, pp. 37-40 (Mar. 1977).
Zwicker et al "Evaluation of Centrifugally Cast TiA15Fe2.5 Alloy for Implant Material" Lehrstuhl Werkstoffwissenschaft (Metalle) Institut fur Werkstoffwissenschaften, Universitat ErlangenNurnberg FRG, pp. 171-178.
Oka et al. "Manufacturing of Automative Engine Valves by Plasma Package Melting of Titanium Scraps", Sixth World Conference on Titanium, France 1988, pp. 621-626.
Schadlich-Stubenrach, et al. "Numerical Simulation of the Alpha CCase as a Quality Criterion for the Investment Casting of Small Thin-Walled Titanium Parts", Sixth World Conference on Titanium, France 1988, pp. 629-654.

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