Oxide coated cutting tool

  • US 5,487,625 A
  • Filed: 11/30/1993
  • Issued: 01/30/1996
  • Est. Priority Date: 12/18/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A coated cutting tool body with one or more refractory layers of which at least one layer is alumina, said alumina layer having a thickness (d) of 0.5-25 μ

  • m and a single phase α

    -structure with a grain size (s);

    
    
    space="preserve" listing-type="equation">0.5 μ

    m<

    s<

    1 μ

    m for 0.5 μ

    m<

    d<

    2.5 μ

    m; and

    
    
    space="preserve" listing-type="equation">0.5 μ

    m<

    s<

    3 μ

    m for 2.5 μ

    m<

    d<

    25 μ

    m,said alumina layer exhibiting a texture coefficient greater than 1.3 for the (012) growth direction of the equivalent crystallographic planes defined as;

    ##EQU2## wherein;

    I(hkl)=measured intensity of the (hkl) reflection;

    Io (hkl)=standard intensity of the ASTM standard powder pattern diffraction data; and

    n=number of reflections used in the calculation, wherein (hkl) reflections used are;

    (012), (104), (110), (113), (024), (116).

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