| 摘要 |
PROBLEM TO BE SOLVED: To improve oxidation resistance and wear resistance and contrive drying and speeding up of cutting by coating a tool with films limiting metallic components contained in a TiSi compound and a TiAl compound within specified values alternately by one layer or more. SOLUTION: One material selected from among high speed steel, cemented carbide, thermet and ceramics is defined as base material. An (a) layer of a hard film is one selected from among nitride, carbon nitride, oxynitride and oxycarbonitride constituted of 10% or more and 60% or below of Si and less than 10% of one kind or two kinds such as B, Al and remainder of Ti by atom % of only metallic components, has a NaCl type crystalline structure and has a lattice constant of 0.417 nm or more and 0.423 nm or below. A (b) layer is one selected from among nitride, carbonitride, oxynitride and oxycarbonitride constituted of Al: 40% or more and 75% or below and less than 10% of one kind or two kinds or more of B and Si and the remainer of Ti by atom % of only metallic components and is constituted of a NaCl type crystalline structure. The (a) layer and the (b) layers are applied alternately by each one layer or more and the (b) layer is located just above the surface of the base material.
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