Magnetorheological finishing of chemical-vapor deposited zinc sulfide via chemically and mechanically modified fluids

We describe the anisotropy in the material removal rate (MRR) of the polycrystalline, chemical-vapor deposited zinc sulfide (ZnS). We define the polycrystalline anisotropy via microhardness and chemical erosion tests for four crystallographic orientations of ZnS: (100), (110), (111), and (311). Anis...

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Bibliographic Details
Published in:Applied optics (2004) 2016-02, Vol.55 (6), p.1481-1489
Main Authors: Salzman, Sivan, Romanofsky, Henry J, Giannechini, Lucca J, Jacobs, Stephen D, Lambropoulos, John C
Format: Article
Language:English
Subjects:
Anisotropy
Finishing
Magnetorheological fluids
Planes
Single crystals
Zinc sulfides
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Summary:We describe the anisotropy in the material removal rate (MRR) of the polycrystalline, chemical-vapor deposited zinc sulfide (ZnS). We define the polycrystalline anisotropy via microhardness and chemical erosion tests for four crystallographic orientations of ZnS: (100), (110), (111), and (311). Anisotropy in the MRR was studied under magnetorheological finishing (MRF) conditions. Three chemically and mechanically modified magnetorheological (MR) fluids at pH values of 4, 5, and 6 were used to test the MRR variations among the four single-crystal planes. When polishing the single-crystal planes and the polycrystalline with pH 5 and pH 6 MR fluids, variations were found in the MRR among the four single-crystal planes and surface artifacts were observed on the polycrystalline material. When polishing the single-crystal planes and the polycrystalline with the modified MR fluid at pH 4, however, minimal variation was observed in the MRR among the four orientations and a reduction in surface artifacts was achieved on the polycrystalline material.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.55.001481