分析了混合磨料在蓝宝石衬底化学机械抛光(CMP)过程中的作用机理,并对比了SiO2水溶胶磨料和SiO2与Al2O3混合磨料对蓝宝石衬底去除速率的影响.研究表明,在主磨料SiO2水溶胶中加入浓度为20mL/L同粒径纳米级的Al2O3可以使CMP过程中的化学作用与机械作用达到相互平衡,使抛光去除速率得到明显提高.在距抛光终点5～10min通过调整工艺参数与抛光液配比,使表面粗糙度由2.32nm降至0.236nm.
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