Published in:
Smart Materials and Structures, 29 (2020) 11, Seite 114003
Language:
Not determined
DOI:
10.1088/1361-665x/abb21c
ISSN:
0964-1726;
1361-665X
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title>
<jats:p>To study the rheological properties and polishing performance of magnetorheological fluids (MRFs) prepared with SiO<jats:sub>2</jats:sub>@carbonyl iron (CI) core-shell particles, SiO<jats:sub>2</jats:sub>@CI core-shell particles with different shell thicknesses were synthesized by an improved Stöber method controlling the amount of tetraethyl orthosilicate (TEOS). Then, four types of MRFs which dispersed with core-shell particles with thin shells, core-shell particles with thick shells, SiO<jats:sub>2</jats:sub> particles, or carbonyl iron were prepared for sapphire polishing. The results show that the rheological properties of MRF based on thicker shell SiO<jats:sub>2</jats:sub>@CI are enhanced compared to those of MRFs prepared by dispersing abrasive and CI. Comparing with other MRFs, sapphire can obtain better surface quality when using thicker shell SiO<jats:sub>2</jats:sub>@CI. The MRF fabricated by SiO<jats:sub>2</jats:sub>@CI core-shell particles can increase the contact area between the abrasive and the workpiece and enhance the contact stress, which improves the solid-phase reaction rate and mechanical removal efficiency of silica and sapphire, thereby improve the polishing efficiency.</jats:p>