| abstract |
Even if providing a kind of interrupted cut at glass hard steel also to play the resistance to cBN instrument collapsing cutter and wearability and playing excellent cutting ability in life-time service of excellence in processing.It solves above-mentioned problem in the following manner: in cBN sintered body cutting tool, and as tool base, described cBN particle, the cBN sintered body at least containing cBN particle as hard phase composition is had on surface the Al that average thickness is 1.0～10nm 2 O 3 Layer, this Al 2 O 3 Layer has the cut that average formation ratio is less than more than 0.02 0.20, and described cBN sintered body has at the periphery of described cBN particle and individually comprises the combination phase of TiN or comprise TiN and TiC, TiB 2 、TiCN、AlN、Al 2 O 3 , the combination phase of WC etc., by when the volume in the region of 50nm is set to 100 volume % from the surface of described cBN particle, adds up to and be formed at the Al on the surface of described cBN particle 2 O 3 With Al present in described combination mutually 2 O 3 After average content ratio be 2～40 volume %. |