Improved recycling method for al-b4c composite materials

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 21/00 (2006.01) B22D 21/04 (2006.01) C22C 1/02 (2006.01) G21F 1/08 (2006.01)

Patent

CA 2563439

A method is described for reclaiming an Al-B4C composite scrap material. The method involves heating a liquid pool of molten aluminum while also pre- heating the scrap material. The scrap material is then added to the molten aluminum and a predetermined melt temperature is maintained in the liquid pool until all of the scrap material melts into the molten aluminum to form a resultant composite melt. Finally, the resultant composite melt is stirred to promote uniformity. A method is also described for preparing a B4C-containing aluminum cast composite products that involves preparing a mixture of free- flowing B4C particles and molten aluminum and stirring the mixture to wet the aluminum to the B4C particles. The mixture is then cast into a cast composite material and processed to form the cast composite product and Al-B4C composite scrap material. The scrap material is then reclaimed by the method described above.

L'invention concerne un procédé de recyclage de matériau composite Al-B¿4?C mis au rebut : échauffement de bain liquide d'aluminium fondu et pré-échauffement du matériau mis au rebut, puis adjonction du matériau en question au bain et maintien d'une température de fusion préétablie dans le bain jusqu'à la fusion de la totalité du matériau dans ce bain, pour donner un produit composite fondu, et brassage de ce produit aux fins d'uniformité. On décrit aussi un procédé d'élaboration de produits composites en aluminium coulés contenant B¿4?C : préparation d'un mélange de particules B¿4?C fluides et d'aluminium fondu, brassage du mélange pour mouiller l'aluminium aux particules en question, puis coulée en matériau composite, et traitement en produit composite de coulée et en matériau composite Al-B¿4?C mis au rebut, et enfin recyclage du matériau mis au rebut selon le procédé susmentionné.

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