Zirconia-coated carbonyl-iron-particle-based magnetorheological fluid for polishing optical glasses and ceramics.
We report on magnetorheological finishing (MRF) spotting experiments performed on glasses and ceramics using a zirconia-coated carbonyl-iron (CI)-particle-based magnetorheological (MR) fluid. The zirconia-coated magnetic CI particles were prepared via sol-gel synthesis in kilogram quantities. The coating layer was approximately 50-100 nm thick, faceted in surface structure, and well adhered. Coated particles showed long-term stability against aqueous corrosion. "Free" nanocrystalline zirconia polishing abrasives were cogenerated in the coating process, resulting in an abrasive-charged powder for MRF. A viable MR fluid was prepared simply by adding water. Spot polishing tests were performed on a variety of optical glasses and ceramics over a period of nearly three weeks with no signs of MR fluid degradation or corrosion. Stable material removal rates and smooth surfaces inside spots were obtained.
Shafrir
Shai N
SN
Laboratory for Laser Energetics, University of Rochester, 240 East River Road,Rochester, New York 14623, USA. shai.shafrir@rochester.edu
Romanofsky
Henry J
HJ
Skarlinski
Michael
M
Wang
Mimi
M
Miao
Chunlin
C
Salzman
Sivan
S
Chartier
Taylor
T
Mici
Joni
J
Lambropoulos
John C
JC
Shen
Rui
R
Yang
Hong
H
Jacobs
Stephen D
SD