Zirconia coated carbonyl iron particle-based magnetorheological fluid for polishing

Shai N. Shafrir, Henry J. Romanofsky, Michael Skarlinski, Mimi Wang, Chunlin Miao, Sivan Salzman, Taylor Chartier, Joni Mici, John C. Lambropoulos, Rui Shen, Hong Yang, Stephen D. Jacobs

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Aqueous magnetorheological (MR) polishing fluids used in magnetorheological finishing (MRF) have a high solids concentration consisting of magnetic carbonyl iron particles and nonmagnetic polishing abrasives. The properties of MR polishing fluids are affected over time by corrosion of CI particles. Here we report on MRF spotting experiments performed on optical glasses using a zirconia coated carbonyl iron (CI) particle-based MR fluid. The zirconia coated magnetic CI particles were prepared via sol-gel synthesis in kg quantities. The coating layer was ̃50-100 nm thick, faceted in surface structure, and well adhered. Coated particles showed long term stability against aqueous corrosion. "Free" nano-crystalline zirconia polishing abrasives were co-generated in the coating process, resulting in an abrasivecharged powder for MRF. A viable MR fluid was prepared simply by adding water. Spot polishing tests were performed on a variety of optical glasses over a period of 3 weeks with no signs of MR fluid degradation or corrosion. Stable material removal rates and smooth surfaces inside spots were obtained.

Original languageEnglish (US)
Title of host publicationOptical Manufacturing and Testing VIII
StatePublished - Oct 19 2009
Externally publishedYes
EventOptical Manufacturing and Testing VIII - San Diego, CA, United States
Duration: Aug 4 2009Aug 5 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptical Manufacturing and Testing VIII
Country/TerritoryUnited States
CitySan Diego, CA


  • Abrasives
  • Carbonyl iron
  • Magnetorheological finishing
  • Magnetorheological fluids
  • Optical glass
  • Zirconia

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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