Investigation of electrorheological fluid for optical finishing

Abstract

Electrorheological (ER) finishing is a promising technique for polishing optical mirrors lenses. Silicone oil-based ER finishing fluid with ceria particles as abrasive was developed, whose dispersed phase was alumina, titanium dioxide, silica, and starch, respectively. Experiments were performed in detail under the voltage of 3000 V, after 25 min of polishing a K9 glass. By using the ER fluid developed in this paper, with 47.62% starch, 47.62% silicone oil, and 4.76% ceria, the surface roughness of the K9 glass was reduced from 8.46 nm R_a to 3.45 nm R_a. The result verifies the validity of the developed ER fluid.

Keywords

electrorheological fluid / polishing slurry / shear stress

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Acknowledgements

The authors would like to acknowledge the support provided by a grant from the Research Grants Council of the Hong Kong Special Administrative Region (No. 9041577).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg