C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/5831 (2006.01)
Patent
CA 2361717
a sintered material containing high-pressure phase-type boron nitride and a binder is provided. The high-pressure phase-type boron nitride is contained in an amount of from 50% to 78% by volume, and the balance is a binder phase. The binder phase comprises at least one selected from the group consisting of nitride, carbide, carbonitride, and boride of Ti, nitride, boride and oxide of Al, carbide and boride of W, nitride, carbide, carbonitride and boride of Co, and carbide and boride of Ni, or a mutual solid solution thereof. The binder phase forms a binder phase which is continuous in a sintered material texture. The weight of metal components Al, W, Co and Ni which are present as compounds in the sintered material is from 3% to 20% based on the sintered material. The sintered material is excellent in crater resistance and capable of realizing a long tool life, even under the condition that the temperature of the cutting edge becomes high and the impact is large, as in high-speed interrupted cutting of hardened steel where the cutting speed V becomes at least 150 m/min.
L'invention porte sur un produit fritté compact comportant de 50 à 78 % en volume de nitrure de bore sous forte pression et le reliquat, d'un liant comportant au moins un élément choisi parmi: un nitrure, un carbure, un carbonitrure ou un borure de Ti; un nitrure, un borure ou un oxyde d'Al; un carbure ou un borure de W; un nitrure, un carbure, un carbonitrure ou un borure de Co; un carbure ou un borure de Ni; et leurs différentes solutions solides. Le liant constitue une phase continue du produit fritté et la teneur totale en composants métallique d'Al, W, Co et Ni présents sous forme de composés est de 3 à 20 % en poids du produit fritté. Ce dernier présente une excellente résistance à la formation de cratères même lors de processus de coupe où la lame du couteau est à température élevée et où le produit fritté est soumis à des chocs violents tels qu'on en rencontre dans le découpage intermittent d'acier trempé à des vitesses de coupe élevées de 150 m/min ou plus, d'où une longue durée de vie.
Fukaya Tomohiro
Kukino Satoru
Nakai Tetsuo
Shiraishi Junichi
Marks & Clerk
Sumitomo Electric Industries Ltd.
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