| 摘要 |
<p>It is an object of the present invention to provide a sintered cBN compact having excellent wear resistance and fracture resistance even in machining centrifugally cast iron having a property of being difficult to machine, and to provide a sintered cBN compact tool. A sintered cBN compact of the present invention contains 20% by volume or more and 65% by volume or less of cBN and, as a binder, 34% by volume or more and less than 80% by volume of Al 2 O 3 , at least one selected from the group consisting of nitrides, carbides, carbonitrides, borides, and boronitrides of Zr and solid solutions thereof (hereinafter, referred to as "X"), and ZrO 2 , the total amount of X and ZrO 2 being 1.0% by volume or more and 6.0% by volume or less, the volume ratio of ZrO 2 to Al 2 O 3 , ZrO 2 /Al 2 O 3 , being 0.010 or more and less than 0.100, in which the ratio I tetragonal ZerO2 (011)/I ±Al2O3 (110) is 0.1 or more and 3 or less, where I tetragonal ZrO2 (101) is the intensity of the (101) plane of tetragonal ZrO 2 and I ±Al2O3 (110) is the intensity of the (110) plane of ±Al 2 O 3 among X-ray diffraction peaks of the sintered cBN compact.</p> |
