Method and apparatus for charging a crucible

C - Chemistry – Metallurgy – 22 – C

Patent

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53/365, 39/8

C22C 1/02 (2006.01) F27B 14/08 (2006.01) F27D 3/00 (2006.01) F27D 1/00 (2006.01) F27D 5/00 (2006.01)

Patent

CA 1152757

Abstract In inserting a bar of metal into a refractory crucible of a conventional vacuum furnace, a covering is placed over the leading end of the bar to reduce scoring of the crucible and the production of chips or particles of refractory material. The covering is softer than the refractory crucible and has shock absorbing properties. The covering is disintegrated upon heating of the bar and turns into constituent components which have no adverse effect on the chemical composition of the molten metal to be poured from the crucible. In the preferred practice the covering is a preformed boot which fits the leading end of the bar and is formed of an expanded unsaturated aliphatic or substituted aliphatic hydrocarbon polymer such as expanded polyethylene.

345788

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