Process for the preparation of refined tantalum or niobium

Details Process for the preparation of refined tantalum or niobium Process for the preparation of refined tantalum or niobium

1986-07-08

1988-03-01

Godici, Nicholas P.

Metal founding

Process

Shaping liquid metal against a forming surface

164494, 75 65EB, 75 65ZM, 75 84, B22D 1100, C22B 3400

Patent

active

047279281

ABSTRACT:
Tantalum or niobium in the form of powder or pieces containing volatile impurities, e.g. sodiothermic tantalum powder, is first converted into crude cast metal by plasma melting and then the crude cast metal is refined by electron beam melting.

REFERENCES:
patent: 3342250 (1967-09-01), Treppshuhe et al.
patent: 3343828 (1967-09-01), Hunt
patent: 3425826 (1969-02-01), Schmidt et al.
patent: 3547622 (1970-12-01), Hutchinson
patent: 3838288 (1974-09-01), Stolz et al.
patent: 3894573 (1975-07-01), Paton et al.
patent: 4518418 (1985-05-01), Fletcher et al.
patent: 4627148 (1986-12-01), Imahashi et al.
Chemical Abstracts, vol. 67, 1967, p. 5339; abstract 72f.
Chemical Abstracts, vol. 96, 1982, p. 264; abstract 73011w.
Chemical Abstracts, vol. 99, 1983, p. 255; abstract 126768u.
Chemical Abstracts, vol. 100, 1984, p. 271; abstract 72690f.
Journal of Metals, index to vol. 18, Dec. 1966, p. 1303-1308.

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