Ti_(3)AlC_(2)对PcBN材料显微结构及性能的影响  

Effect of Ti_(3)AlC_(2)content on microstructure and properties of PcBN materials

作　　者：马金明 肖长江[1] 陶宏均 张群飞 汤黎辉 曹剑锋 李远 周世杰 唐昱霖 陈亚超 栗正新[1] MA Jinming;XIAO Changjiang;TAO Hongjun;ZHANG Qunfei;TANG Lihui;CAO Jianfeng;LI Yuan;ZHOU Shijie;TANG Yulin;CHEN Yachao;LI Zhengxin(School of Materials Science and Engineering,Henan University of Technology,Zhengzhou 450001,China;ZYNP Group DING RUI Technology Co.,Ltd.,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179-184,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(2021KJZX0062)。

摘　　要：以不同质量分数的Ti_(3)AlC_(2)为结合剂,在5.5 GPa、1450℃的条件下,制备整体式PcBN复合刀具材料,分析不同质量分数的Ti_(3)AlC_(2)对PcBN刀具材料的物相、显微结构及力学性能的影响。结果表明:Ti_(3)AlC_(2)在高温高压下会完全分解成TiC、Al-Ti合金,并与cBN反应生成AlN、TiB_(2)和TiC_(0.7)N_(0.3)等物相;TiC、AlN、TiB_(2)和TiC_(0.7)N_(0.3)均匀分布在cBN周围并与cBN紧密黏结在一起,从而提升PcBN的力学性能。当Ti_(3)AlC_(2)质量分数为25%时,PcBN的相对密度、抗弯强度、断裂韧性和磨耗比均达到最大值,分别为98.9%、592 MPa、6.87 MPa·m^(1/2)和7350;当Ti_(3)AlC_(2)质量分数为20%时,PcBN的显微硬度达到最大值4786.7 HV。The monolithic PcBN composite tool materials were prepared at 5.5 GPa and 1450℃with different contents of Ti_(3)AlC_(2)as the binder phase.The effects of different mass fractions of Ti_(3)AlC_(2)on the phase composition,microstructure,and mechanical properties of PcBN tool materials were studied.The results show that Ti_(3)AlC_(2)can decompose completely to form TiC and Al-Ti alloys under high temperature and high pressure,and reacts with cBN to form AlN,TiB_(2),and TiC_(0.7)N_(0.3)phases.TiC,AlN,TiB_(2),and TiC_(0.7)N_(0.3)are uniformly distributed around the cBN and tightly bonded to the cBN,thereby improving the mechanical properties of PcBN.When the mass fraction of Ti_(3)AlC_(2)is 25%,the relative density,bending strength,fracture toughness,and wear ratio of PcBN reach the maximum values,which are 98.9%,592 MPa,6.87 MPa·m^(1/2)and 7350,respectively.When the mass fraction of Ti_(3)AlC_(2)is 20%,the microhardness of PcBN reaches the maximum value of 4786.7 HV.

关 键 词：聚晶立方氮化硼 Ti_(3)AlC_(2) 结合剂 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]