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以碳化硼(B4C)粉、硼(B)粉和氮化硼纳米管(BNNTs)为原料,采用热压烧结工艺,制备出高性能BNNTs/B4C陶瓷复合材料。研究了烧结温度对BNNTs/B4C陶瓷复合材料显微结构与力学性能的影响。采用硬度计、万能试验机、X射线衍射仪、扫描电镜等手段对样品性能进行了表征。实验结果表明,在最佳烧结温度2050℃,保温时间30 min,压力30 MPa时,BNNTs/B4C陶瓷复合材料的相对密度达到99.6%,力学性能最佳,维氏硬度、弯曲强度和断裂韧性分别为38.6 GPa、513.19 MPa、6.58 MPa·m1/2。
High performance BNNTs / B4C ceramic composites were prepared by hot pressing sintering process using boron carbide (B4C) powder, boron (B) powder and BNNTs as raw materials. The effects of sintering temperature on the microstructure and mechanical properties of BNNTs / B4C ceramic composites were investigated. The properties of the samples were characterized by means of hardness tester, universal testing machine, X-ray diffraction and scanning electron microscope. The experimental results show that the relative density of BNNTs / B4C ceramic composites reaches 99.6% with the optimal sintering temperature of 2050 ℃, holding time of 30 min and pressure of 30 MPa, and the mechanical properties are the best, Vickers hardness, flexural strength and fracture toughness are respectively 38.6 GPa, 513.19 MPa, 6.58 MPa · m1 / 2.