| 摘要 |
<p>A texture-hardened alpha-alumina coated tool is provided to prevent plastic deformation of a cutting blade remarkably. A texture-hardened alpha-alumina coated tool includes a coated cutting tool insert and a texture-hardened -Al2 O3 layer to be used in metal machining. The alumina layer improves toughness and adheres to the substrate covering all functional parts thereof. The coating includes one or more refractory layers of which at least one layer is a texture-hardened -Al2 O3 having a thickness ranging from 2 to 20mum composed of columnar grains with a length/width ratio of 2 to 12. The -Al2 O3 exhibits a strong (0006) diffraction peak. The improved wear resistance and toughness are obtained when the texture coefficient(TC) for the (0006) reflection is larger than 1.33 In h+2, where h is the -Al2 O3 layer thickness and when the surface of the -Al2 O3 layer is wet-blasted to an Ra value <1 m. The alumina layer with a strong (0001) texture is applied on Binder phase enriched cemented carbide substrates. This combination contributes to enhanced wear resistance and toughness.</p> |
