×

SURFACE-COATED BORON NITRIDE SINTERED BODY TOOL

  • US 20160047031A1
  • Filed: 02/26/2014
  • Published: 02/18/2016
  • Est. Priority Date: 03/29/2013
  • Status: Abandoned Application
First Claim
Patent Images

1. A surface-coated boron nitride sintered body tool in which at least a cutting edge portion comprises a cubic boron nitride sintered body and a coating layer formed on a surface of said cubic boron nitride sintered body,said cubic boron nitride sintered body comprising not less than 30% and not more than 80% by volume of cubic boron nitride, and also comprising a binder phase containing an aluminum compound, an inevitable impurity, and at least one compound selected from the group consisting of a nitride, a carbide, a boride, and an oxide of a group 4 element, a group 5 element, and a group 6 element of a periodic table of elements, as well as a solid solution thereof,said coating layer including a layer A and a layer B,said layer A being composed of MLaza1, where M represents one or more of Al, Si, as well as a group 4 element, a group 5 element, and a group 6 element of the periodic table of the elements;

  • La represents one or more of B, C, N, and O; and

    za1 is not less than 0.85 and not more than 1.0,said layer B being formed by alternately laminating one or more layers of each of two or more thin-film layers having different compositions,each of said thin-film layers having a thickness more than 30 nm and less than 200 nm,a B1 thin-film layer as one of said thin-film layers being composed of (Ti1-xb1-yb1Sixb1M1yb1)(C1-zb1Nzb1), where M1 represents one or more of Al as well as a group 4 element, a group 5 element, and a group 6 element of the periodic table of the elements except for Ti;

    xb1 is not less than 0.01 and not more than 0.25;

    yb1 is not less than 0 and not more than 0.7; and

    zb1 is not less than 0.4 and not more than 1,a B2 thin-film layer as one of said thin-film layers different from said B1 thin-film layer being formed by alternately laminating one or more layers of each of two or more compound layers having different compositions,each of said compound layers having a thickness not less than 0.5 nm and less than 30 nm,a B2a compound layer as one of said compound layers being composed of (Ti1-xb2-yb2Sixb2M2yb2)(C1-zb2Nzb2), where M2 represents one or more of Al as well as a group 4 element, a group 5 element, and a group 6 element of the periodic table of the elements except for Ti;

    xb2 is not less than 0.01 and not more than 0.25;

    yb2 is not less than 0 and not more than 0.7; and

    zb2 is not less than 0.4 and not more than 1,a B2b compound layer as one of said compound layers different from said B2a compound layer being composed of (Al1-xb3M3xb3)(C1-z3Nzb3), where M3 represents one or more of Si as well as a group 4 element, a group 5 element, and a group 6 element of the periodic table of the elements;

    xb3 is not less than 0.2 and not more than 0.77; and

    zb3 is not less than 0.4 and not more than 1,said layer A having a thickness not less than 0.2 μ

    m and not more than 10 μ

    m,said layer B having a thickness not less than 0.05 μ

    m and not more than 5 μ

    m, andsaid coating layer having an overall thickness not less than 0.25 μ

    m and not more than 15 μ

    m.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×