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Method-and-apparatus-for-making-a-thixotropic-metal-slurry

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Method and apparatus for making a thixotropic metal slurry

Details

Inventors: Norville, Samuel M. D.; Wang, Shaupoh; Lombard, Patrick J.;
Assignee: AEMP Corporation (Jackson, TN)
Primary Examiner: Kastler; Scott
Assistant Examiner:
Attorney, Agent or Firm: Woodard, Emhardt, Naughton Moriarty & McNett

An apparatus for producing a thixotropic metallic melt by simultaneously controlledly cooling and stirring the melt to form solid particles of a first phase suspended in a residual liquid second phase. Vigorous stirring of the metallic melt results in the formation of degenerate dendritic particles having substantially spheroidal shapes. The metallic melt is stirred to rapidly and efficiently circulate the forming semi-solid slurry. Circulation of the forming semi-solid slurry results in a substantially uniform temperature throughout. Through precision stirring and cooling, a semi-solid slurry is formed having a first solid phase of about 70-80 wt. % suspended in a second liquid phase.

DETAILED DESCRIPTION The present invention relates to a method and apparatus for producing a thixotropic metallic melt by simultaneously controlledly cooling and stirring the melt such that solid particles of a first phase begin to precipitate in a residual liquid second phase.
Dendritic growth of the solid particles is curtailed by vigorously stirring the metallic melt, resulting in degenerate dendritic particles having a substantially spheroidal character.
The metallic melt is stirred such that the metal is rapidly and efficiently circulated, so as to quickly reach a substantially uniform temperature throughout.
Through precision stirring and cooling, the metallic melt is maintained with about 70-80% of the melt being solid spheroidal particles of a first phase suspended in a liquid medium of a second phase.
One form of the present invention is an apparatus for forming a molten metal mass from solid metal processors under an inert gas atmosphere, automatically transferring a portion of the molten metal mass into a mixing chamber, and rapidly cooling and stirring the transferred portion of molten metal to form a thixotropic semi-solid metallic slurry suitable for molding.
One object of the present invention is to provide an improved system for the production of a thixotropic metallic melt comprising a first phase of degenerate dendritic solid particles suspended in a second liquid phase, wherein the first phase comprises about 70-80 percent of the melt.
Related objects and advantages of the present invention will be apparent from the following description.

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