碳纳米管对混合粒径PcBN复合材料性能的影响  

Effect of CNTs on properties of PcBN composites with mixed particle size

作　　者：肖长江[1] 马金明 陶宏均 张群飞 曹剑锋 李远 周世杰 唐昱霖 陈亚超 栗正新[1] 董清妍 XIAO Changjiang;MA Jinming;TAO Hongjun;ZHANG Qunfei;CAO Jianfeng;LI Yuan;ZHOU Shijie;TANG Yulin;CHEN Yachao;LI Zhengxin;DONG Qingyan(School of Materials Science and Engineering,Henan University of Technology,Zhengzhou 450001,China;ZYNP Group Dingrui Technology,Jiaozuo 454750,Henan,China;Recision Industry Revolution Equipment Technology(Henan)Co.,Ltd.,Zhengzhou 450001,China;Zhengzhou Wode Superhard Material Co.,Ltd.,Zhengzhou 450001,China;Zhengzhou Hitko Dia/CBN Tool Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]河南工业大学材料科学与工程学院,郑州450001 [2]中原内配集团鼎锐科技有限公司,河南焦作454750 [3]精工锐意科技(河南)有限公司,郑州450001 [4]郑州沃德超硬材料有限公司,郑州450001 [5]郑州海科研磨工具有限公司,郑州450001

出　　处：《金刚石与磨料磨具工程》2024年第2期193-198,共6页Diamond & Abrasives Engineering

基　　金：工业和信息化部科技高质量发展项目(203ZS20230005);河南省重大科技专项(221100230100);河南省2024年重点研发专项“新能源汽车关键零部件用高端系列超硬磨具研制及产业化”;郑州市重大科技专项项目(2021KJZX0062)。

摘　　要：为提高高温高压制备的聚晶立方氮化硼(PcBN)复合材料的性能,以颗粒尺寸分别为0~0.5μm和0.5~1.0μm的混合粒径立方氮化硼(cBN)为原材料,Al-Ti-Al_(2)O_(3)为结合剂,加入不同质量分数的碳纳米管,在高温高压条件下烧结制备PcBN复合材料,研究碳纳米管质量分数对PcBN复合材料结构和性能的影响。结果表明:添加碳纳米管后,PcBN和碳纳米管间没有发生化学反应,碳纳米管以增强体的形式存在于复合材料内部;复合材料较致密,碳纳米管的添加使PcBN的相对密度先增大后减小。当碳纳米管添加质量分数为1.5%时,PcBN的相对密度有最大值97.9%,同时PcBN有最大的显微硬度和断裂韧性,分别为3892 HV和6.82 MPa·m^(1/2);当碳纳米管的添加质量分数为1.0%时,PcBN有最大的抗弯强度和磨耗比,分别为584 MPa和6873。碳纳米管拔出和桥连作用提高了PcBN复合材料的力学性能。To improve the performance of PcBN composites prepared under high temperature and high pressure,mixed cBN particle sizes ranging from 0 to 0.5μm and 0.5 to 1.0μm were used as the raw material,Al-Ti-Al_(2)O_(3)was used as the binder and the carbon nanotubes with different contents were added.The PcBN composites were prepared by sintering under high temperature and high pressure conditions.The effect of carbon nanotube content on the structure and properties of PcBN composites was investigated.The results show that there is no chemical reaction between PcBN and carbon nanotubes after the addition of carbon nanotubes,and the carbon nanotubes exist in the form of reinforcement inside the composite.The composite material is relatively dense,and the relative density of PcBN increases first and then decreases with the addition of carbon nanotubes.When the mass fraction of carbon nanotubes added is 1.5%,the relative density of PcBN reaches its maximum value of 97.9%,while PcBN has the maximum microhardness and fracture toughness of 3892 HV and 6.82 MPa·m^(1/2),respectively.When the mass fraction of carbon nanotubes added is 1.0%,PcBN has the maximum bending strength and wear ratio,which are 584 MPa and 6873 MPa,respectively.The pull-out and bridging effects of carbon nanotubes improve the mechanical properties of PcBN composites.

关 键 词：聚晶立方氮化硼 混合粒径 碳纳米管 高温高压 力学性能 

分 类 号：TQ164[化学工程—高温制品工业] TG74[金属学及工艺—刀具与模具]