碳纳米管对原位生成WCoB-TiC金属陶瓷组织与性能的影响  

Effect of carbon nanotubes on microstructure and properties of in-situ synthesized WCoB-TiC cermets

作　　者：蔡子佳 潘应君[1] 柯德庆[1] 朱星宇 CAI Zi-jia;PAN Ying-jun;KE De-qing;ZHU Xing-yu(Faculty of Materials Science,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学材料学部,湖北武汉430081

出　　处：《材料热处理学报》2025年第1期1-10,共10页Transactions of Materials and Heat Treatment

基　　金：省部共建耐火材料与冶金国家重点实验室青年基金项目(2018QN04)。

摘　　要：采用真空液相烧结工艺制备了碳纳米管增强WCoB-TiC金属陶瓷复合材料,分析了不同碳纳米管添加量对其组织与性能的影响。结果表明:适量添加碳纳米管可以细化复合材料的颗粒,使得组织分布更加均匀。当碳纳米管添加量为0.5 mass%时,WCoB-TiC金属陶瓷的颗粒尺寸最为细小,约为1.60μm,颗粒细化效果最佳,此时断裂韧性达到了10.10 MPa·m^(1/2),相比于未添加碳纳米管时的8.32 MPa·m^(1/2)提高了21.4%,增韧效果明显。碳纳米管对WCoB-TiC金属陶瓷增韧的机制主要是裂纹偏转增韧、拔出增韧、桥联增韧和棱状撕裂增韧的共同作用结果。Carbon nanotubes reinforced WCoB-TiC cermet composites were prepared by vacuum liquid phase sintering technology,and the effect of different carbon nanotube additions on their microstructure and properties was analyzed.The results show that the appropriate addition of carbon nanotubes can refine the particles of the composites and make the microstructure distribution more uniform.When the addition amount of carbon nanotubes is 0.5 mass%,the particle size of the WCoB-TiC cermets is the smallest,about 1.60μm,the particle refinement effect is optimal,with the fracture toughness of 10.10 MPa·m^(1/2),which is 21.4%higher than that of without the addition of carbon nanotubes of 8.32 MPa·m^(1/2),and the toughening effect is significant.The toughening mechanisms of the WCoB-TiC cermets by carbon nanotubes are mainly the combined effect of crack deflection toughening,pull-out toughening,bridging toughening and prismatic tearing toughening.

关 键 词：WCoB-TiC 碳纳米管 真空液相烧结 微观组织 力学性能 

分 类 号：TB333.1[一般工业技术—材料科学与工程]