Cutting tool made of al2o3-coated cbn-based sintered material

Details Cutting tool made of al2o3-coated cbn-based sintered material Cutting tool made of al2o3-coated cbn-based sintered material

B - Operations, Transporting

24

D

B24D 3/14 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01)

Patent

CA 2296971

A cutting tool according to the present invention is coated with one or more Al2O3 layers on at least a part of the surface of a cBN-based sintered material substrate taking part in cutting. The sintered material substrate is made of cBN in an amount of from 20% to 99% by volume and Al2O3 having an average crystalline particle diameter of not more than 1 µm in an amount of from not less than 1.0% to less than 10% by volume. The Al2O3 layer has a thickness (d) of from 0.5 µm to 50 µm. The average crystalline particle diameter (s) of Al2O3 is from 0.01 µm to 4 µm if the thickness (d) of the Al2O3 layer is from 0.5 µm to 25 µm or from not less than 0.01 µm to not more than 10 µm if the thickness (d) of the Al2O3 layer is from more than 25 µm to 50 µm.

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