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

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/cm³、85.5 HRB、253 MPa、113.0 J/mm² down to the volume fraction of hBN 11% is 5.31 g/cm³、44.5 HRB、103 MPa、99.5 J/mm² 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%.