| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cutting tip made of a cubic crystal boron nitride group ultrahigh pressure sintered material having excellent resistance to chipping. <P>SOLUTION: This cutting tip made of the cubic crystal boron nitride group ultrahigh pressure sintered material is made of the cubic crystal boron nitride group ultrahigh pressure sintered material which is a sintered body of press molding having a blending composition composed of two kinds or more of titanium nitride, titanium carbonitride, and titanium carbide or titanium carbonitride as a connection phase formation component of 15 to 45% by mass % which show three phase texture of a connection phase, a dispersed phase, and an intermediate close adhesion phase provided between cubic crystal boron nitride constituting the dispersed phase and the connection phase substantially by observation of texture using a scanning type electronic microscope, an intermetallic compound of Ti and Al as an intermediate close adhesion phase formation component of 2 to 12%, tungusten carbide of 2 to 10%, aluminum oxide as a dispersed phase formation component of 2 to 12%, and cubic crystal boron nitride of remaining parts (containing 40 to 65%). <P>COPYRIGHT: (C)2003,JPO |
