| 摘要 |
A furnace 20, particularly for copper or copper alloys is bounded by sidewall 1, roof wall 2 and floor wall 3, comprising heat insulating material 4, mainly of aluminium oxide and silicon oxide fibres, and an outer steel coat. A crucible is fitted into the furnace on a stand 6. High temperature silicon carbide heating elements 8 are located between two opposite side walls of the furnace and the outer surface of the crucible 7 free from contact with any other article in the furnace. The heating elements are supported by shock absorbers and each element has a clearance between its central axis and the outer surface of the crucible of two to four times the outer diameter of one heating element. <IMAGE> |
