| 摘要 |
PURPOSE:To enable melting and casting a copper alloy contg. active metals in a non-oxidizing atmosphere by providing a melting and casting crucible in a vacuum chamber and penetrating airtightly a casting nozzle in the upper part of the nozzle. CONSTITUTION:The inside of a vacuum chamber 1 is evacuated and a copper alloy contg. active metals such as Zr, Ti, Cr, etc. is melted in a melting and casting crucible 6. A casting nozzle 8 is in the uppermost position and the opening thereof is closed by a cap 10 in this stage. When a copper alloy is melted, an inert gas is introduced through an introducing pipe 3 to pressurize the inside of the chamber 1 to the atmospheric pressure. The nozzle 8 is pulled down to be immersed in the molten metal and the aperture at the top end is opened to insert a seed wire into the nozzle 8. The pressure in the chamber 1 is increased to bring the molten metal into contact with the seed wire then the seed wire is pulled up. The molten metal is pulled up by following up to the seed wire and is cooled to solidify by the nozzle 8. A round wire 1 of the copper alloy having the outside diameter conforming to the inside diameter of the nozzle 8 is taken out.
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