Study on the composition, microstructure and mechanical properties of PCBN composites synthesized by TiN–AlN–Ti combined with cBN

Preparation and cutting performance study of YSZ-toughened PcBN superhard tools

“…From the figure, it can be seen that the composition of the material phase includes cBN, TiC, AlN and TiB 2 when YSZ is not introduced into the material system, and the diffraction peaks of Al and Ti are not observed in the spectra, which shows that during the sintering process, the metal phase will bond with the matrix cBN particles by reaction under high temperature and pressure, and AlN, TiN and TiB 2 are generated. 12,18 TiC itself undergoes slow oxidation in air at high temperatures, but the diffraction peaks of TiO 2 are not observed in the phase diagram, while no diffraction peaks of other carbides appear, indicating that TiC does not oxidize or react with other components of the material system during the sintering process, and is dispersed inside the material body in the form of particles. During the sintering process, factors such as higher pressure and shorter sintering time avoid the occurrence of TiC oxidation.…”

“…Mo Peicheng, Chen Chao et al prepared PcBN composite inserts with Al–Ti–W as binder at 1550 °C and 5.5 GPa, and found that when the W content was 6 wt%, the inserts had optimal mechanical properties, with hardness and flexural strength reaching 30.71 GPa and 972.3 MPa, respectively. 18 Eriki, Ananda Kumar et al investigated the cutting performance of PcBN on titanium alloy (gr2) and obtained smooth cutting surfaces at cutting speeds of 15–45 m min −1 , feeds of 0.1–0.2 mm/ r , and back draft of 0.1 mm. 19 Liu Zhanqiang et al studied the tool wear morphology and wear mechanism of PcBN high-speed cutting of titanium alloy TC4, and proved that bonded wear, diffuse wear and brittle wear are the main wear mechanisms when PcBN high-speed cutting titanium alloy.…”