Cubic boron nitride sintered body

C - Chemistry – Metallurgy – 22 – C

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C22C 29/16 (2006.01)

Patent

CA 2549424

A cubic boron nitride sintered compact according to a first invention which comprises a cubic boron nitride (cBN) particles and a binder for binding the above cBN particles. This sintered particles comprise 70 to 98 vol % of cBN particles and the balanced amount of a binder, which binder in turn comprises a Co compound, an Al compound, WC and a solid solution of them, wherein cBN particles in the sintered compact contain 0.03 wt % or less of Mg and 0.001 to 0.05 wt % of Li. A cubic boron nitride sintered compact according to a second invention which is the cubic boron nitride sintered compact according to a first invention, wherein the binder is an Al compound, instead of the binder in the first invention. The above cubic boron nitride sintered compact exhibits excellent resistance to the occurrence of a defect and excellent resistance to abrasion, in combination.

La présente invention concerne un comprimé fritté de nitrure de bore cubique qui comprend des particules de nitrure de bore (cBN) et un liant permettant de lier lesdites particules de cBN. Ces particules frittées comprennent de 70 à 98% en vol. de particules de cBN et la quantité restante d'un liant qui à son tour comprend un composé de Co, un composé de Al, WC et une solution solide de ceux-ci. Les particules de cBN dans le comprimé fritté contiennent au plus 0,03% en poids de Mg et de 0,001 à 0,05% en poids de Li. La présente invention concerne également un comprimé fritté de nitrure de bore cubique dans lequel le liant est un composé de Al. Ce comprimé fritté de nitrure de bore cubique présente une excellente résistance à l'apparition d'un défaut et une excellente résistance à l'abrasion.

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