| 摘要 |
A molten metal treatment apparatus comprising a passage of predetermined size and length for receiving superheated molten metal from a source thereof, and for supplying the molten metal for subsequent casting; a gas inlet and a control valve for controlling the velocity of the molten metal through the passage by exposing the molten metal to a source of pressurized gas; a cooling jacket at least partially surrounding the passage for controlling the temperature of the molten metal within the passage between predetermined upper and lower limits for forming a thin solidified shell having a molten metal core within the passage; the combination of the velocity of molten metal and the temperature of the molten metal within the passage for allowing dendrites to grow into the molten core from the solidified shell, and for breaking off portions of the dendrites and entraining them in the molten metal thereby producing a solids content within the molten metal for subsequent casting. A method for producing a partial solids content within a molten metal stream for subsequent casting including the steps of flowing molten metal at a controlled velocity through a passage of predetermined area to length ratio and cooling the passage at a controlled rate to form dendrites on the inner surface of the passage.
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