Effect of sintering temperature on synthesis of PCBN in cBN-Ti-Al-W system

摘要

Polycrystalline cubic boron nitride (PCBN) was prepared under high-temperature and ultra high-pressure. The influence of sintering temperature on composition, micro-structure, relative density, porosity, micro-hardness and flexural strength of the PCBN was investigated by means of X-ray diffraction (ARD), field scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the phase components of PCBN have no significant difference, which are composed of BN, TiN, TiB2, W, MN, W2B and Al3Ti when the sintering temperature at 1500 degrees C-1600 degrees C. The cBN crystals connect with each other by the reaction product.