Hard composite material for tools

Details Hard composite material for tools Hard composite material for tools

B - Operations, Transporting

24

D

B24D 99/00 (2010.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01) C04B 41/87 (2006.01) C04B 41/89 (2006.01) C09K 3/14 (2006.01) C22C 26/00 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2161611

Hard composite material for tools, comprising a substrate of CBN sintered body containing more than 20 % by volume of cubic boron nitride or diamond sintered body containing more than 40 % by volume of diamond. The substrate has at least one layer of hard heat-resisting film consisting mainly of Ti, Al and at least one element selected from a group consisting C, N and O on a portion or portions of said substrate where cutting participate. Improved in strength of base material, wear- resistance and oxidation-resistance, less reactive with iron and showing longer tool life comparing to known cutting tools and usable in wider applications such as hardened steel, cast ion and simultaneous cutting of cast ion and aluminum alloy.

Matériau composite dur pour outils, constitué d'un substrat à base d'un corps fritté de NBC renfermant plus de 20 % en volume de nitrure de bore cubique, ou d'un corps fritté de diamant renfermant plus de 40 % en volume de diamant. Le substrat comporte au moins une couche d'une pellicule dure thermorésistante, constituée principalement de Ti, d'Al et d'au moins un élément choisi dans un groupe comprenant C, N et O, sur une partie ou des parties dudit substrat, dont la fonction est de couper. Les améliorations portent sur la résistance du matériau de base, la résistance à l'usure et à l'oxydation, la réactivité moindre avec le fer et la durée de vie plus longue de l'outil, comparativement à des outils de coupe connus; de plus les applications sont plus étendues, couvrant notamment l'acier durci, la fonte et la coupe simultanée de la fonte et des alliages d'aluminium.

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