Magnetorheological fluid template for basic studies of mechanical-chemical effects during polishing

Chunlin Miao; Kirk M. Bristol; Anne E. Marino; Shai N. Shafrir; Jessica E. DeGroote; Stephen D. Jacobs

doi:10.1117/12.731251

14 September 2007 Magnetorheological fluid template for basic studies of mechanical-chemical effects during polishing

Chunlin Miao, Kirk M. Bristol, Anne E. Marino, Shai N. Shafrir, Jessica E. DeGroote, Stephen D. Jacobs

Proceedings Volume 6671, Optical Manufacturing and Testing VII; 667110 (2007) https://doi.org/10.1117/12.731251
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

We developed a new magnetorheological (MR) fluid for studying the relative contributions of mechanics and chemistry in polishing hard materials. The base carrier fluid is a mixture of two non-aqueous liquids. At conventional carbonyl iron (CI) magnetic particle concentrations, removal rates with this formulation were unacceptably low for the polycrystalline optical ceramic aluminum oxynitride (ALON). We overcame this problem by creating a high magnetic solids concentration suspension consisting of a blend of large and small CI particles. Our test bed for experiments was a magnetorheological finishing (MRF) spot-taking machine (STM) that can only polish spots into a non-rotating part. We demonstrated that, using this new MR fluid formulation, we could substantially increase peak removal rates on ALON with small additions of nonmagnetic, nanodiamond abrasives. Material removal with this fluid was assumed to be predominately driven by mechanics. With the addition of small amounts of DI water to the base fluid containing nanodiamonds, the peak removal rate showed an additional increase, presumably due to the altered fluid rheology and possibly chemical interactions. It is possible, however, that this result is due to increased fluid viscosity as well. Interestingly, the microtexture on the surfaces of the ALON grains (albeit-two different ALON parts) showed distinctly different features when spotted with nanodiamonds or with nanodiamonds and water, and an understanding of this phenomenon is the goal of future work. In this paper we describe the difficult fluid viscosity issues that were addressed in creating a viable, high removal rate, non-aqueous MR fluid template that could be pumped in the STM for several days of experiments.

Citation Download Citation

Chunlin Miao, Kirk M. Bristol, Anne E. Marino, Shai N. Shafrir, Jessica E. DeGroote, and Stephen D. Jacobs "Magnetorheological fluid template for basic studies of mechanical-chemical effects during polishing", Proc. SPIE 6671, Optical Manufacturing and Testing VII, 667110 (14 September 2007); https://doi.org/10.1117/12.731251

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available