| abstract |
The present invention provides a cBN sintered body having excellent fracture resistance and wear resistance in difficult-to-cut centrifugal cast iron processing. The present invention is a cBN sintered body comprising a cBN component of 50% or more and 90% or less or 40% or more and 85% or less by volume, and alumina and zirconia are contained in the cBN sintered body by volume. 9 to 50%, and the zirconia / alumina weight ratio is 0.1 to 4 inclusive. The tool using the cBN sintered body according to the present invention for the part involved in cutting is superior in strength, hardness and toughness of the cBN sintered body. Performance is improved in cast iron processing. [Selection figure] None |