Low-porosity gamma titanium aluminide cast articles and their pr

Details Low-porosity gamma titanium aluminide cast articles and their pr Low-porosity gamma titanium aluminide cast articles and their pr

1996-12-31

1998-10-20

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164516, B22D 2720

Patent

active

058232435

ABSTRACT:
The inside surface of the mold used to cast gamma titanium aluminide articles is pretreated with a facecoating of an inoculant such as titanium diboride or titanium carbide. When the molten metal of the composition that produces the gamma titanium aluminide is cast into the mold, the facecoating nucleates grains at the surface of the casting, which inhibits the formation of surface-connected porosity in the casting. Subsequent hot isostatic pressing of the article produces a sounder article than otherwise could be achieved.

REFERENCES:
patent: 3158912 (1964-12-01), Schweikert
patent: 3614976 (1971-10-01), Bolling et al.
patent: 5314000 (1994-05-01), Wang et al.
patent: 5337800 (1994-08-01), Cook
patent: 5354351 (1994-10-01), Kampe et al.
patent: 5505246 (1996-04-01), Colvin et al.

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