单晶SiC基片的磁流变化学复合抛光

基于芬顿反应的磁流变化学复合抛光加工原理，对单晶SiC基片进行磁流变化学复合抛光试验，研究工艺参数对其抛光效果的影响。结果表明:随着金刚石磨粒粒径的增大，材料去除率先增大后减小，而表面粗糙度先减小后增大；随着磨粒质量分数的增大，材料去除率增大，而表面粗糙度先减小后增大；当羰基铁粉质量分数增大时，材料去除率增大，而表面粗糙度呈先减小后增大的趋势；随着氧化剂质量分数增大，材料去除率先增大后减小，而表面粗糙度呈现先减小后增大的趋势；加工间隙对材料去除率的影响较大，加工间隙为1.0?mm时，加工表面质量较好；随着工件转速和抛光盘转速增大，材料去除率均先增大后减小，表面粗糙度均先减小后增大。获得的优化的工艺参数为:磨粒粒径，1.0 μm；磨粒质量分数，5%；羰基铁粉质量分数，25%；过氧化氢质量分数，5%；加工间隙，1.0 mm；工件转速，500 r/min；抛光盘转速，20 r/min。采用优化的工艺参数对表面粗糙度约为40.00 nm的单晶SiC进行加工，获得表面粗糙度为0.10 nm以下的光滑表面。 

Magnetorheological chemical compound polishing of single crystal SiC substrate

Based on the magnetorheological chemical composite polishing principle of Fenton reaction, the magnetorheological chemical composite polishing experiment was carried out on single crystal SiC substrate, and the influence of process parameters on the polishing effect was studied. The results show that with the increase of diamond particle size, material removal increases first and then decreases, while surface roughness decreases first and then increases. With the increase of abrasive mass fraction, material removal rate increases, and surface roughness decreases first and then increases. When the mass fraction of carbonyl iron powder increases, material removal rate increases, while surface roughness decreases first and then increases. With the increase of oxidant mass fraction, material removal increases first and then decreases, while the surface roughness decreases first and then increases. The influence of machining gap on material removal rate varies greatly. When machining gap is 1.0 mm, machined surface quality is better. With the increase of workpiece speed and polishing disc speed, the material removal rate first increases and then decreases, and the surface roughness first decreases and then increases. The optimized process parameters are as follows: the abrasive particle size is 1.0 μm, the mass fraction is 5%, the mass fraction of carbonyl iron powder is 25%, the mass fraction of hydrogen peroxide is 5%, the machining gap is 1.0 mm, the workpiece speed is 500 r/min, and the polishing disc speed is 20 r/min. The single crystal SiC with surface roughness of about 40.00 nm was processed with optimized process parameters to obtain a smooth surface with surface roughness of less than 0.10 nm.