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AssigneeSumitomo Electric Industries, Ltd.
InventorsSatoru Kukino, Mitsuhiro Goto, Tetsuo Nakai, Makoto Setoyama, Takashi Yoshioka
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Super hard composite material for tools, comprising a substrate of CBN sintered body containing more than 20% by volume of cubic boron nitride (CBN), improved in strength of base material, wear-resistance, hardness at high temperatures and acid-resistance usable in cutting work of steels which are difficult to be machined. The substrate (2) has a laminated film (1) consisting of super thin films (a) and (b) each deposited alternatively on the substrate (2), the super thin film (a) being made of nitride and/or carbide of at least one element selected from a group comprising IVa group elements, Va group elements, VIa group elements, Al and B and possessing a crystal structure of cubic system and metallic bond property, the super thin film (b) being made of at least one compound possessing a crystal structure other than cubic system and covalent bond property under equilibrium condition at ambient temperature and pressure, each unit layer of the super thin films (a) and (b) having a thickness of 0.2 nm to 20 nm, and the laminated film (1) on the whole possessing a crystal structure of cubic system.
A cutting tool comprising a super hard composite material, comprising a substrate of cubic boron nitride sintered body containing more than 20% by volume of cubic boron nitride on which is laminated a film consisting of super thin films (a) and (b), each deposited alternatively on at least a portion of said substrate where cutting occurs, said super thin film (a) being made of nitride, carbide or carbonitride of at least one element selected from a group consisting of IVb group elements, Vb group elements, VIb group elements, Al and B and possessing a crystal structure of cubic system and metallic bond property, said super thin film (b) being made of at least one compound possessing a crystal structure other than cubic system and covalent bond property under equilibrium condition at ambient temperature and pressure, each unit layer of said super thin films (a) and (b) having a thickness of 0.2 nm to 20 nm, and said laminated film on the whole possessing a crystal structure of cubic system.
Dependencies are inferred from the claim text.