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Title: Surface-texture evolution of different chemical-vapor-deposited zinc sulfide flats polished with various magnetorheological fluids

The macro-structure of chemical-vapor-deposited (CVD) zinc sulfide (ZnS) substrates is characterizedby cone-like structures that start growing at the early stages of deposition. As deposition progresses,these cones grow larger and reach centimeter size in height and millimeter size in width. It is challengingto polish out these features from the top layer, particularly for the magnetorheological finishing (MRF)process. A conventional MR fluid tends to leave submillimeter surface artifacts on the finished surface,which is a direct result of the cone-like structure. Here we describe the MRF process of polishing four CVD ZnS substrates, manufactured by four differentvendors, with conventional MR fluid at pH 10 and zirconia-coated-CI (carbonyl iron) MR fluids at pH 4, 5,and 6. We report on the surface–texture evolution of the substrates as they were MRF polished with thedifferent fluids. We show that performances of the zirconia-coated-CI MR fluid at pH 4 are significantlyhigher than that of the same fluid at pH levels of 5 and 6 and moderately higher than that of a conventionalMR fluid at pH 10. An improvement in surface–texture variability from part to part was also observedwith the pH 4 MR fluid.
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  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Precision Engineering
Additional Journal Information:
Journal Volume: 43; Journal Issue: 2016; Journal ID: ISSN 0141-6359
Research Org:
Laboratory for Laser Energetics, University of Rochester, Rochester, NY (United States)
Sponsoring Org:
Country of Publication:
United States
MRF; CVD ZnS; polishing; pebbles; surface artifacts
OSTI Identifier: