六方氮化硼含量对铁基金刚石磨具性能的影响  

Effect of hexagonal boron nitride content on properties of iron-based diamond abrasives

作　　者：韩志静 徐三魁[1] 韩平[1] 邹文俊[1] HAN Zhijing;XU Sankui;HAN Ping;ZOU Wenjun(School of Material Science and Engineering, Henan University of Technology, Zhengzhou 450000, China)

机构地区：[1]河南工业大学材料科学与工程学院

出　　处：《金刚石与磨料磨具工程》2019年第4期75-79,共5页Diamond & Abrasives Engineering

基　　金：国家自然科学青年基金项目(21302043);河南工业大学高层次人才基金项目(201313S065)

摘　　要：通过真空烧结法制备含六方氮化硼(hBN)的铁基金刚石磨具试验条,研究hBN含量对样条的硬度、抗弯强度、抗冲击强度和磨耗比的影响规律,并用电镜分析其磨削面形貌,判断其磨削面烧伤情况.结果显示:添加hBN使磨具样品的密度、硬度、抗弯强度和抗冲击强度下降,分别由不添加hBN时的6.57 g/cm^3、85.5 HRB、253 MPa、113.0 J/mm^2依次下降到添加hBN体积分数为11%时的5.31 g/cm^3、44.5 HRB、103 MPa、99.5 J/mm^2,分别下降了19.2%、48.0%、59.3%、11.9%;且在相同的磨削条件下添加hBN能有效降低磨具的摩擦系数,提高磨具中金刚石的出刃率,进而大幅度降低磨削过程中磨具的烧伤,当hBN添加量体积分数为11%时其烧伤最小,且磨具的磨削效果最佳.The iron-based diamond abrasive tool test strip containing hexagonal boron nitride (hBN)was prepared by vacuum sintering.The effects of hBN content on hardness, bending strength, impact strength and wear ratio of the samples were studied. The morphology of the grinding surface was analyzed by electron microscopy, and the burning condition of the grinding surface was judged.The results show that the density, hardness, bending strength and impact strength of the abrasive tool samples decrease with the addition of hBN, with no hBN added is 6.57 g/cm^3 、85.5 HRB、253 MPa、113.0 J/mm^2 down to the volume fraction of hBN 11% is 5.31 g/cm^3 、44.5 HRB 、103 MPa、99.5 J/mm^2 respectively down to 19.2%、48.0%、59.3%、11.9%,and the friction coefficient of the abrasive tool can be effectively reduced and the protrusion rate of the diamond in the abrasive tool can be improved by adding hexagonal boron nitride under the same grinding conditions, thus greatly reducing the burns of the abrasive tool in the grinding process and effectively improving the grinding quality of the workpiece.Grinding burn is minimal when the volume fraction of hexagonal boron nitride is 11%.

关 键 词：铁基金刚石磨具 六方氮化硼 机械性能 磨削性能 

分 类 号：TQ164[化学工程—高温制品工业]