Texture-hardened alpha-alumina coated tool

A cutting tool insert, comprising a cemented carbide body and a coating;

• wherein the body comprises WC, about 6-9 wt-% Co and about 6.5-9.5 wt-% cubic carbides of at least one metal selected from the group consisting of groups IVb, Vb and VIb of the periodic table;
• wherein the body has an S-value of about 0.79-0.90 and a coercivity of about 9-18 kA/m;
• wherein at least one surface of the body comprises a binder phase enriched surface zone having a thickness of about 5-50 μm and being essentially free from cubic carbides adjacent the coating;
• wherein the coating comprises at least one α-Al2O3 layer;
• wherein the α-Al2O3 layer is about 4-7 μm thick;
• wherein the α-Al2O3 layer forms the uppermost layer;
• wherein the α-Al2O3 layer is wet-blasted to Ra<about 1 μm;
• wherein the α-Al2O3 layer comprises columnar grains with a length/width ratio from about 2-15 and TC(0006)≧about 4.5;
• wherein the coating further comprises a first layer adjacent to the body;
• wherein the first layer of the coating comprises a material selected from the group consisting of CVD Ti(C,N), CVD TiN, CVD TiC, CVD HfN, MTCVD Ti(C,N), MTCVD Ti(C,O,N), MTCVD Zr(C,N), MTCVD Zr(C,O,N), MTCVD Ti(B,C,N), MTCVD (Ti,Al)(C,O,N) and combinations thereof;
• and
• wherein the first layer of the coating has a thickness of from about 4-10 μm.

A cutting tool insert, comprising a cemented carbide body and a coating;

• wherein the body comprises WC, about 4-6 wt-% Co and about 5-10 wt-% cubic carbides of at least one metal selected from the group consisting of groups IVb, Vb and VIb of the periodic table;
• wherein the body has an S-value of about 0.79-0.90 and a coercivity of about 9-18 kA/m;
• wherein at least one surface of the body comprises a binder phase enriched surface zone having a thickness of about 5-50 μm and being essentially free from cubic carbides adjacent the coating;
• wherein the coating comprises at least one α-Al2O3 layer;
• wherein the α-Al2O3 layer is about 6-15 μm thick;
• wherein the α-Al2O3 layer forms the uppermost layer;
• wherein the α-Al2O3 layer is wet-blasted to Ra<about 1 μm;
• wherein the α-Al2O3 layer comprises columnar grains with a length/width ratio from about 2-20 and TC(0006) about 5.0;
• wherein the coating further comprises a first layer adjacent to the body;
• wherein the first layer of the coating comprises a material selected from the group consisting of CVD Ti(C,N), CVD TiN, CVD TiC, CVD HfN, MTCVD Ti(C,N), MTCVD Ti(C,O,N), MTCVD Zr(C,N), MTCVD Zr(C,O,N), MTCVD Ti(B,C,N), MTCVD (Ti,Al)(C,O,N) and combinations thereof;
• and
• wherein the first layer of the coating has a thickness of from about 4-15 μm.