Method of producing high-purity metal member

Details Method of producing high-purity metal member Method of producing high-purity metal member

1984-12-06

1986-12-09

Godici, Nicholas P.

Metal working

Method of mechanical manufacture

Assembling or joining

295277, 164469, 164494, 164495, B21D 3900, B23P 1100

Patent

active

046271481

ABSTRACT:
A high-purity metal member is produced by charging raw material such as sponge zirconium into a cavity of a mold such as a hearth under a vacuum atmosphere; irradiating the material with electron beams to melt it at a limited area of the cavity while forming a molten metal pool and irradiating the pool with the electron beam thereby elevate the molten metal pool to evaporate away impurities therein; and shifting the mold relative to the electron beams to provide a high-purity metal member. The metal pool is limited in its size and irradiated high energy density electron beams so that the temperature is raised whereby the impurities are easily evaporated away. The mold may have an annular cavity. In case of high-purity sleeve formation, the electron beams are irradiated onto the raw material while rotating the mold so that melting and solidification appear in a circumferential direction to be repeated. The impurities are repeatedly exposed to the electron beams.

REFERENCES:
patent: 2388974 (1945-11-01), Hopkins
patent: 2651668 (1953-09-01), Southern
patent: 3013315 (1961-12-01), Smith, Jr.
patent: 3152372 (1964-10-01), Hopkins
patent: 3820586 (1974-06-01), Takei
patent: 4261412 (1981-04-01), Soykan et al.

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