A vacuum-suction degassing method and an apparatus therefor

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 7/04 (2006.01) C21C 7/10 (2006.01) C22B 9/04 (2006.01) C22B 9/05 (2006.01)

Patent

CA 2044724

A melt is stored in a vessel placed in a decompression vessel. On the bottom of the vessel is arranged a bubble generator made of porous bricks, and bubbles of argon gas are introduced into the melt through this bubble generator. Also a lower half section of a degassing member is immersed in the melt. This degassing member has a cylindrical form with the lower end closed and the section immersed in the melt is made of a porous material permeable to gases and impermeable to melts. With these features, a surface of molten metal can be put under reduced pressure and high content components of the melt can be removed by means of bubbling, and also solute components in the melt can be removed into bubbles of argon gas. Also, gases in the melt and gases produced by reactions between the melt and the porous material can be sucked through a wall of the degassing member into inside thereof and removed.

Un creuset rempli de métal fondu est placé dans une enceinte sous vide. Le fond du creuset comprend un générateur de bulles en briques poreuses par lesquelles de l'argon est injecté dans le métal fondu. Par ailleurs, la moitié inférieure d'un élément dégazeur est immergée dans le métal fondu. Cet élément se présente sous la forme d'un cylindre fermé à son extrémité et sa partie immergée est en matériau perméable aux gaz mais non au métal fondu. Grâce à ces caractéristiques, on peut créer une dépression à la surface du métal fondu et extraire au moyen des bulles produites les composants volatils présents dans le métal fondu ainsi que les composants dissous dans le métal. Egalement, les gaz présents dans le métal fondu et les gaz résultant des réactions entre le métal et le matériau poreux peuvent être aspirées à travers la paroi de l'élément dégazeur et évacués.

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