钛含量对PCBN复合材料性能的影响

Effect of titanium content on the properties of PCBN composites

摘要: 探讨了Ti含量变化对PCBN复合材料合成和性能的影响，以开发出具有优异性能的PCBN复合材料。使用CBN、Al₂O₃和Ti粉作为原料，在高温高压下成功合成了PCBN复合材料。深入分析了材料的物相特征、硬度、抗弯强度、断裂韧性和微观结构。结果显示，当Ti粉的添加量在9%左右时，PCBN复合材料的显微硬度、抗弯强度以及断裂韧性都达到最大值，分别为34.2 GPa、900 MPa和7.8 MPa·m^1/2，与未添加Ti粉的样品相比分别提高了10%、25%、31%。

Abstract: In this study, the effect of Ti content variation on the synthesis and properties of PCBN composites was investigated in order to develop PCBN composites with excellent properties. PCBN composites were successfully synthesized under high temperature and pressure using CBN, Al₂O₃ and Ti powders as raw materials. The physical phase characteristics, hardness, flexural strength, fracture toughness and microstructure of the materials were analyzed in depth. The results show that the microhardness, flexural strength, and fracture toughness of the PCBN composites reach the maximum values of 34.2 GPa, 900 MPa, and 7.8 MPa.m^1/2, respectively, when the addition of Ti powders is around 9 %, which are increased by 10%, 25%, and 31%, respectively, compared with that of the samples without adding Ti powders.