| Citation: | MA Yuhan, ZHANG Baorui, ZHOU Changle, CHEN Baochi, WANG Daqing, TIAN Xin, DING Yunlong. Preparation process and performances of cBN-Fe magnetic abrasive particles[J]. Diamond & Abrasives Engineering, 2023, 43(4): 422-431. doi: 10.13394/j.cnki.jgszz.2022.0130
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In order to solve the problems of low hardness in the grinding phase material of magnetic abrasive particles prepared by the existing sintering method, the grinding effects on high-hardness and poor magnetic conductivity materials, such as titanium alloys, were found to be poor. Additionally, the hardest diamond material could not be used as the grinding phase to prepare magnetic abrasive particles by the sintering method. In this study, the cBN-Fe magnetic abrasive particles were prepared by sintering with Fe powder as the matrix and cBN powder as the grinding phase. The study focused on using Ti-6A1-4V (TC4) plates as the grinding objects, and the effects of sintering time, heating rate and raw material ratio on the grinding performances of cBN-Fe magnetic abrasive particles were explored using a control variable method. The aim was to determine the optimal preparation process parameters of cBN-Fe magnetic abrasive particles. Taking 45# steel and 202 stainless steel as grinding workpieces, the performance of cBN-Fe magnetic abrasive particles were compared with that of Al2O3-Fe and SiC-Fe magnetic abrasive particles, both prepared by the sintering method. The surface roughness and morphology of the workpieces before and after grinding with three kinds of magnetic abrasive particles were compared. Moreover, the grinding performance and service life of different magnetic abrasive particles were investigated. The results show that the best grinding performances for cBN-Fe magnetic abrasive particles was achieved when using a mass ratio of Fe powder to cBN powder of 3∶1, a sintering temperature of 1150 ℃, a sintering time of 6 h, a holding time of 2 h and a heating rate of 3.19 ℃/min. Furthermore, it is found that the grinding performance of cBN-Fe magnetic abrasive particles is better than that of Al2O3-Fe and SiC-Fe magnetic abrasive particles prepared by sintering. The service life of cBN-Fe magnetic abrasive particles is 1.6 times and 1.3 times longer than that of Al2O3-Fe and SiC-Fe magnetic abrasive particles, respectively.
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