Using TiN-Ti-AlN as the binder, polycrystalline cubic boron nitride (PCBN) composites containing Y₂O₃ and not containing Y₂O₃ were prepared under high temperature and ultra-high pressure conditions, respectively. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the phase composition, microstructure and surface crack morphology of the composite material. At the same time, the compactness, microhardness and bending strength of the composite material were tested. The research results show that the phase composition of PCBN sample is mainly composed of BN, TiB₂, TiN, AlN and Y₂O₃ at an ultra-high pressure of 5.5 GPa and a temperature of 1500 °C. With the increase of Y₂O₃ content, the relative density of PCBN first increases and then decreases, and the changes in mechanical properties also tend to be similar. As the content of Y₂O₃ increases, it can be seen that the peak intensity of the main peak of TiB₂ also increases, indicating that the addition of Y₂O₃ promotes the reaction between cBN and Ti. When the Y₂O₃ content is 3.6%, PCBN has the best comprehensive mechanical properties, with a microhardness of 34.56 GPa and a bending strength of 890 MPa.

以TiN-Ti-AlN为粘结剂，分别在高温和超高压条件下制备了含Y ₂ O ₃和不含Y ₂ O ₃的多晶立方氮化硼（PCBN）复合材料。采用X射线衍射(XRD)和扫描电镜(SEM)对复合材料的相组成、显微组织和表面裂纹形貌进行分析。同时对复合材料的致密性、显微硬度和弯曲强度进行了测试。研究结果表明，PCBN样品的相组成主要由BN、TiB ₂、TiN、AlN和Y ₂ O _3组成。在 5.5 GPa 的超高压和 1500 °C 的温度下。随着Y ₂ O ₃含量的增加，PCBN的相对密度先增大后减小，力学性能的变化也趋于相似。随着Y ₂ O ₃含量的增加，可以看出TiB ₂主峰的峰强度也增加，说明Y ₂ O ₃的加入促进了cBN与Ti的反应。当Y ₂ O ₃含量为3.6%时，PCBN的综合力学性能最好，显微硬度为34.56 GPa，抗弯强度为890 MPa。