Composite sintered body

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 35/5831 (2006.01) B23B 27/14 (2006.01)

Patent

CA 2676513

A sintered composite material comprising 20 to 80% by volume of cubic boron nitride grains and a binder, wherein the binder is one which consists of at least one member selected from the group consisting of nitrides, carbides, borides, oxides and solid solutions of Group 4a, 5a and 6a elements of the periodic table, at least one member selected from the group consisting of simple substances, compounds and solid solutions of Zr, Si, Hf, Ge, W, and Co, and an aluminum compound and which is characterized in that when the sintered composite material contains W and/or Co, the total weight of W and/or Co is below 2.0wt% and the material also contains one or more of Zr, Si, Hf and Ge (hereinafter referred to as ~X~) in an amount of 0.005wt% or above but below 2.0wt% satisfying the relationship: X/(X+W+Co) = 0.01 to 1.0, and that the Al content is 2.0 to 20.0wt%.

L'invention porte sur un matériau composite fritté comprenant 20 à 80 % en volume de grains de nitrure de bore cubique et un liant, le liant étant un liant qui consiste en au moins un élément choisi dans le groupe constitué par les nitrures, les carbures, les borures, les oxydes et les solutions solides des éléments des Groupes 4a, 5a et 6a de la Classification Périodique, au moins un élément choisi dans le groupe constitué par des substances simples, des composés et des solutions solides de Zr, Si, Hf, Ge, W et Co, et un composé de l'aluminium et qui est caractérisé par le fait que, lorsque le matériau composite fritté contient W et/ou Co, le poids total de W et/ou Co est au-dessous de 2,0 % en poids et le matériau contient également un ou plusieurs parmi Zr, Si, Hf et Ge (dans ce qui suit désigné par <= X >=) dans une quantité de 0,005 % en poids ou au-dessus mais au-dessous de 2,0 % en poids, satisfaisant la relation : X/(X+W+Co) = 0,01 à 1,0, et que la teneur en Al est de 2,0 à 20,0 % en poids.

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