| 摘要 |
PURPOSE:To prevent the exfoliation of hard coatings by providing successively a lower underlying layer consisting of TiC added with Co and W, upper underlying layer consisting of TiC or TiCNO, inside layer consisting of TiC and outside layer consisting of TiCO, etc. on the surface of a WC base material, then improving the adhesive strength of the inside layer. CONSTITUTION:The lower underlying layer consisting of 0.01-10wt% Co, 0.01-25% W and the balance TiC is coated on the surface of the WC sintered hard alloy base material to 0.2-3mum average layer thickness. The upper under lying layer consisting of the TiCO or TiCNO is then coated thereon to 0.2-3mum average layer thickness. The inside layer consisting of the TiC is coated thereon to 1-10mum average layer thickness. The outside layer consisting of the single or double layers of 1 or >=2 kinds among TiCO, TiCNO and Al2O3 is finally coated thereon to 0.5-10mum average layer thickness. The average layer thick ness of the hard coating layers constituted of the respective layers is made 2-20mum. Such surface-coated cutting tool is free from the exfoliation of the coating layers even in high feed and high-speed cutting and exhibits excellent wear resistance.
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