Research on Removal Mechanism of Magnetorheological Polishing of KDP Crystal

Considering the material characteristics of potassium dihydrogen phosphate(KDP) of low hardness,high brittleness and easy deliquescence was proposed.Surface roughness reached PV=13.7nm,Rms=1.1nm.Removal mechanism was deduced to be the result of dissolution reaction via analyzing and comparing both traditional and novel MRF material removal process.The experiments were carried out and testified the dominant role of dissolution reaction in material removal whereas mechanical removal can be ignored;material removal efficiency had a positive relation with shear stress,and had no correlation with orthogonal pressure.