Oxide coated cutting tool
DCFirst Claim
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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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Abstract
A coated cutting tool body is coated with one or several refractory layers of which at least one layer is a dense, fine-grained layer of α-Al2 O3 preferably textured in the (012) direction. The coated tool according to the present invention exhibits excellent surface finish and shows much improved wear and toughness properties compared to prior art objects when used for machining steel, cast iron and, particularly, when machining nodular cast iron.
108 Citations
7 Claims
-
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). - View Dependent Claims (2, 3, 4, 5, 6, 7)
- m and a single phase α
Specification