| 摘要 |
A cubic boron nitride base ultra-high pressure sintered material cutting tip comprising a cubic boron nitride base ultra-high pressure sintered material which exhibits a three phase structure comprising substantially a continuous bonding phase, a hard dispersion phase, and an intermediate intimate contact phase being present between the continuous bonding phase and the hard dispersion phase, as observed by a scanning electron microscope, wherein the continuous bonding phase comprises at lest two of titanium nitride, titanium carbo-nitride and titanium carbide, or 15 to 56 mass % of titanium carbo-nitride, wherein the intermediate intimate contact phase comprises 2 to 10 mass % of a composite nitride of Ti and Al and 2 to 10 mass % of tungsten carbide, and wherein the hard dispersion phase comprises cubic boron nitride in the balanced amount (provided that in the range of 35 to 65 mass %). The tip is excellent in the resistance to chipping.
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