Abstract 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 (XRD), 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, AlN, W2B and Al3Ti when the sintering temperature at 1500 °C–1600 °C. The cBN crystals connect with each other by the reaction product. With the increase of sintering temperature, the porosity of PCBN decreased from 1.05% to 0.53%, and the relative density increased from 94.5% to 99%. When the sintering temperature increasing to 1600 °C, the PCBN exhibit optimal comprehensive mechanical properties with a micro-hardness of 34.64GPa and a flexural strength of 1005.23 MPa.

中文翻译：

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烧结温度对cBN-Ti-Al-W体系中PCBN合成的影响

摘要 在高温超高压下制备了多晶立方氮化硼（PCBN）。通过X射线衍射（XRD）、场扫描电子显微镜（SEM）和能量色散谱研究了烧结温度对PCBN的成分、显微结构、相对密度、孔隙率、显微硬度和抗弯强度的影响(EDS)。结果表明，在1500°C-1600°C的烧结温度下，PCBN的相成分没有显着差异，由BN、TiN、TiB2、W、AlN、W2B和Al3Ti组成。cBN 晶体通过反应产物相互连接。随着烧结温度的升高，PCBN的孔隙率从1.05%下降到0.53%，相对密度从94.5%上升到99%。