| 摘要 |
PCT No. PCT/DE90/00121 Sec. 371 Date Aug. 22, 1991 Sec. 102(e) Date Aug. 22, 1991 PCT Filed Feb. 20, 1990 PCT Pub. No. WO90/10087 PCT Pub. Date Sep. 7, 1990.A process and apparatus for the vacuum treatment of metals. In a tightly sealed vacuum treatment vessel, molten metal is preferably divided, on the surface, into a generally circular sector and a generally ring-shaped sector surrounding the generally circular sector. Preferably, each sector of the molten metal is exposed to different vacuum pressures during vacuum treatment, wherein a generally lower vacuum pressure is applied to the ring-shaped sector than to the circular sector. The two sectors are preferably separated to an immersion depth, in the molten bath, of between 10 and about 20 cm, as measured starting from the ring-shaped sector. |
