| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cutting tool insert composed of a composite comprising a cBN phase, and a binder phase comprising a titanium carbonitride phase and a TiB<SB>2</SB>phase, which can be used for machining of hardened steel, hot and cold working tool steel, forged steel, case hardened steel, high speed steel and ductile gray cast iron. <P>SOLUTION: In an XRD pattern from the composite using CuKa-radiation, a peak height ratio of the strongest (101) TiB<SB>2</SB>peak and the strongest cBN (111) peak is less than 0.06, the (220) peak from the titanium carbonitride phase in the XRD-pattern intersects both vertical lines of PDF lines of TiC (PDF32-1383) and TiN (PDF38-1420) and the lowest intersected point height is at least 0.15 of the maximum (220) peak height of the ceramic binder phase. The insert is made by powder metallurgical methods milling, pressing and sintering, and sintering is performed at lowest possible temperature for shortest possible time necessary to obtain a dense structure. <P>COPYRIGHT: (C)2007,JPO&INPIT |
