title: Magnetorheological finishing of chemical-vapor deposited zinc sulfide via chemically and mechanically modified fluids.
abstract: 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.
authors.forename: Sivan
authors.initials: S
authors.lastname: Salzman
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Romanofsky
authors.forename: Lucca J
authors.initials: LJ
authors.lastname: Giannechini
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Jacobs
authors.forename: John C
authors.initials: JC
authors.lastname: Lambropoulos