Cubic boron nitride base ultra-high pressure sintered material cutting tip

A cutting insert comprising a cubic boron nitride based ultra-high pressure sintered material exhibiting, in a structural observation using an electron microscope, a substantially three-phase structure including a continuously bonded phase, a hard dispersed phase, and an intermediate adhesion phase intervening between the continuously bonded phase and the hard dispersed phase,

• wherein the cubic boron nitride based ultra-high pressure sintered material consists of:
• 20 to 37 wt % of titanium nitride and/or titanium carbonitride, for forming the continuously bonded phase;
• 3 to 8 wt % of an inter-metallic compound having titanium and aluminum, 5 to 10 wt % of a nitride compound having titanium and aluminum, and 5 to 15 wt % of tungsten carbide, for forming the intermediate adhesion phase;
• and
• 35 to 55 wt % of the cubic boron nitride, as the balance, for forming the hard dispersed phase.

A cutting insert comprising a cubic boron nitride based ultra-high pressure sintered material exhibiting, in a structural observation using an electron microscope, a substantially three-phase structure including a continuously bonded phase, a hard dispersed phase, and an intermediate adhesion phase intervening between the continuously bonded phase and the hard dispersed phase,

• wherein the cubic boron nitride based ultra-high pressure sintered material consists of:
• 10 to 32 wt % of titanium nitride and/or titanium carbonitride, and 5 to 10 wt % of tantalum carbide, for forming the continuously bonded phase;
• 3 to 8 wt % of an inter-metallic compound having titanium and aluminum, 5 to 10 wt % of a nitride compound having titanium and aluminum, and 5 to 15 wt % of tungsten carbide, for forming the intermediate adhesion phase;
• and
• 35 to 55 wt % of the cubic boron nitride, as the balance, for forming the hard dispersed phase.

A cutting insert comprising a cubic boron nitride based ultra-high pressure sintered material exhibiting, in a structural observation using an electron microscope, a substantially three-phase structure including a continuously bonded phase, a hard dispersed phase, and an intermediate adhesion phase intervening between the continuously bonded phase and the hard dispersed phase,

• wherein the cubic boron nitride based ultra-high pressure sintered material consists of:
• 10 to 32 wt % of titanium nitride and/or titanium carbonitride, and 5 to 10 wt % of niobium carbide, for forming the continuously bonded phase;
• 3 to 8 wt % of an inter-metallic compound having titanium and aluminum, 5 to 10 wt % of a nitride compound having titanium and aluminum, and 5 to 15 wt % of tungsten carbide, for forming the intermediate adhesion phase;
• and
• 35 to 55 wt % of cubic boron nitride, as the balance, for forming the hard dispersed phase.