Improved aluminum alloy-boron carbide composite material

Details Improved aluminum alloy-boron carbide composite material Improved aluminum alloy-boron carbide composite material

C - Chemistry, Metallurgy

22

C

C22C 1/10 (2006.01) B22D 19/14 (2006.01) C22C 32/00 (2006.01)

Patent

CA 2500775

A cast composite material is prepared by furnishing an aluminum-based matrix alloy and forming a mixture of free-flowing boron carbide particles and the aluminum-based matrix alloy in molten form which is stirred to wet the matrix alloy to the boron carbide particles and to distribute the particles throughout the volume of the melt. The molten mixture is then cast. The fluidity of the molten mixture is maintained by (a) maintaining the magnesium content of the matrix metal below about 0.2 % by weight, or (b) starting with a matrix metal containing less than 0.2 % by weight magnesium and adding further magnesium to the mixture a short time before casting, or (c) having at least 0.2 % by weight titanium present in the mixture.

La présente invention concerne un matériau composite coulé que l'on prépare en constituant un alliage matriciel à base d'aluminium et en formant un mélange de particules de carbure de bore à écoulement fluide et de l'alliage matriciel à base d'aluminium en fusion, que l'on remue afin de mouiller les particules de carbure de bore avec l'alliage matriciel et de distribuer les particules dans tout le volume de la matière fondue. On coule ensuite le mélange en fusion. On maintient la fluidité du mélange en fusion en (a) maintenant la teneur en magnésium du métal matriciel autour de 0,2 % en poids, ou (b) en commençant avec un métal matriciel contenant moins de 0,2 % en poids de magnésium et en ajoutant du magnésium supplémentaire au mélange peu de temps avant le coulage, ou (c) en incorporant au moins 0,2 % en poids de titane au mélange.

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