基于研磨氧化锆陶瓷的金刚石/铁磁性磨粒制备研究

Preparation of Diamond/Iron Magnetic Abrasive Particles Based on Grinding Zirconia Ceramics

目的为解决氧化锆陶瓷研磨困难这一问题,制备一种新型磁性磨粒。方法采用粘接法制备金刚石/铁磁性磨粒,探究制备工艺中不同成分配比对其研磨性能的影响。通过扫描电子显微镜对磁性磨粒进行表面形貌分析,结合氧化锆陶瓷板件的研磨试验,采用表面粗糙度测量仪与3D超景深显微镜对研磨前后的工件表面质量作对比分析,以此来评价磁性磨粒的研磨性能,最终确定较优的磁性磨粒制备工艺参数。结果压制力为0.3 MPa,混料与粘合剂质量比为10∶1,粘合剂中6101环氧树脂、有机硅树脂与651固化剂质量比为4∶1∶5时,磁性磨粒的切削刃数、粘合剂自身的粘接强度及耐热性都达到最佳。使用此磁性磨粒研磨40 min后,氧化锆陶瓷板件的表面粗糙度(Ra)由原始的1.493μm降至0.116μm,有效去除了原始表面缺陷和加工纹理,改善了表面质量。结论在粘合剂中加入有机硅树脂可解决研磨相在铁基体上把持力不足的问题,采用此粘接法所制备的金刚石/铁磁性磨粒能够顺利完成对超硬氧化锆陶瓷材料的加工,金刚石/铁磁性磨粒可以作为性能优良的磨削介质参与研磨,并能够满足磁粒研磨光整加工的要求。

The work aims to prepare a new type of magnetic abrasive particles to solve the processing difficulty of zirconia ceramics.Diamond/iron magnetic abrasive particles were prepared by bonding method.The effect of different composition ratios on the abrasive properties in the preparation process was investigated.The surface morphology of magnetic abrasive particles was analyzed by scanning electron microscopy(SEM).Combined with the grinding test of zirconia ceramics plate,the surface quality of the workpiece before and after grinding was compared and analyzed by surface roughness measuring instrument and 3D ultra-depth-of-field microscope to evaluate the grinding performance of magnetic abrasive particles and finally determine the better preparation process parameters of magnetic abrasive particles.When the pressing force was 0.3 MPa,the mass ratio of mixture to binder was 10∶1,and the mass ratio of 6101 epoxy resin,organosilicon resin and 651 curing agent was 4∶1∶5,the cutting edge number of magnetic abrasive particles,and the bonding strength and high-temperature resistance of binder reached the optimum technological parameters.After 40 minutes of grinding with the magnetic abrasive particles,the surface roughness(Ra)of zirconia ceramics plate was reduced from 1.493μm to 0.116μm.The original surface defects and process texture were removed effectively,and the surface quality was improved.Adding organosilicon resin in binder can solve the problem of insufficient holding force of the abrasive phase on the iron matrix.The Diamond/Iron magnetic abrasive particles prepared by this bonding method can process super hard zirconia ceramics materials successfully and can be used as good grinding medium in grinding,and meet the requirements of magnetic abrasive finishing.