纳米金刚石对聚晶立方氮化硼力学性能的影响  

Effect of nano-diamond on mechanical properties of polycrystalline cubic boron nitride

作　　者：张群飞 肖长江[1] 马金明 汤黎辉 栗正新[1] ZHANG Qunfei;XIAO Changjiang;MA Jinming;TANG Lihui;LI Zhengxin(School of Materials Science and Engineering,Henan University of Technology,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

出　　处：《粉末冶金技术》2025年第2期180-184,共5页Powder Metallurgy Technology

基　　金：2023鼎锐河南省科技重点研发专项(231111230500)。

摘　　要：以立方氮化硼(cBN)粉体为原材料,Al粉和Si粉为结合剂,纳米金刚石为添加剂,在5.5 GPa和1500℃下高温高压烧结制备了聚晶立方氮化硼(PcBN),研究了纳米金刚石质量分数对PcBN的物相组成、微观结构、密度、硬度、断裂韧性和磨耗比的影响。结果表明:纳米金刚石的加入对PcBN的性能有很大影响。当金刚石质量分数为5%时,PcBN的相对密度达到最大值(98.5%);随着纳米金刚石含量的增加,PcBN样品的维氏硬度、断裂韧性和磨耗比先升高后下降。当纳米金刚石质量分数为5%时,PcBN的硬度、断裂韧性和磨耗比达到最高值,分别为47 GPa、4.89 MPa·m^(1/2)和6350。Polycrystalline cubic boron nitride(PcBN)was sintered at the high temperature of 1500℃under the pressure of 5.5 GPa,using cubic boron nitride(cBN)powders as the raw materials,Al powders and Si powders as the binders,and nano-diamond as the additive.The effects of nano-diamond mass fraction on the phase composition,microstructure,density,hardness,fracture toughness,and wear ratio of PcBN were investigated.The results show that,the addition of nano-diamond has the great influence on the performance of PcBN.When the diamond mass fraction is 5%,the relative density of PcBN reaches the maximum as 98.5%.Vickers hardness,fracture toughness,and wear ratio of the PcBN samples increase and then drop as the nano-diamond content increases.When the nano-diamond mass fraction is 5%,the hardness,fracture toughness,and wear ratio of PcBN reach the highest values,which are 47 GPa,4.89 MPa·m^(1/2),and 6350,respectively.

关 键 词：聚晶立方氮化硼 纳米金刚石 高温 高压 力学性能 

分 类 号：TF125[冶金工程—粉末冶金] TQ163[冶金工程—冶金物理化学]