摘要
PcBN是一种具有高硬度、高热稳定性和化学稳定性的复合超硬材料,是切削铁系黑色金属的理想刀具材料。随着制造业向精密化方向发展,对PcBN的性能要求不断提升。本研究采用0.5μm cBN粉体,通过高温高压烧结法(压力5.5 GPa,功率1 960~2 380 W,合成时间600 s),以Ti_(3)AlC_(2)-Al为结合剂制备了PcBN。试验结果显示,Ti_(3)AlC_(2)的分解程度随温度升高而增加,2 240 W为完全分解的临界功率。PcBN的最佳烧结功率为2 170 W,此时其密度为3.454 g/cm^(3),磨耗比为2 953,断裂韧性为12.7 MPa·m^(1/2),显微硬度HV为3 403.33,综合性能最优。
PcBN is a composite superhard material with high hardness,high thermal stability,and chemical stability,making it an ideal cutting tool material for machining ferrous black metals.With the advancement of manufacturing towards precision,the performance requirements for PcBN are continuously increasing.In this study,0.5μm cBN powder was used to prepare PcBN via high-temperature high-pressure sintering(pressure:5.5 GPa,power:1960-2380 W,synthesis time:600 s)with a Ti_(3)AlC_(2)-Al binder.Experimental results showed that the decomposition degree of Ti_(3)AlC_(2) increases with rising temperature,and 2240 W is the critical power for complete decomposition.The optimal sintering power for PcBN is 2170 W,at which its density is 3.454 g/cm^(3),the wear ratio is 2953,the fracture toughness is 12.7 MPa·m^(1/2),and the microhardness(HV)is 3403.33,achieving the best comprehensive performance.
作者
周彬
李金玲
汤黎辉
张世强
栗正新
ZHOU Bin;LI Jinling;TANG Lihui;ZHANG Shiqiang;LI Zhengxin(School of Materials Science and Engineering,Henan University of Technology,Zhengzhou 450001,China)
出处
《超硬材料工程》
2026年第1期11-16,共6页
Superhard Material Engineering
基金
工信部高质量发展专项(项目编号:203ZS20230005)
河南省重大科技专项“高端超硬材料制品关键技术研究及产业化”(项目编号:221100230100)
2024年度河南省重点研发专项“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”(项目编号:241111230300)。
