Effects of fumed silica weight fraction on rheological properties of magnetorheological polishing fluids
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Magnetorheological (MR) polishing fluids with excellent rheological characteristics are efficient in material removal of workpiece. In this study, fumed silica (FS) was used as thixotropic agent in MR polishing fluid with ten different weight fractions to find the proper additive amount for good rheological and sedimentation properties. The rheological behavior of samples at several additive concentrations was determined by examining flow properties using a rotational rheometer connected to an external magneto-cell. Experimental results showed that, by adding FS to MR polishing fluids, apparent viscosity and yield stress exhibited an obvious increase, while the shear-thinning index decreased sharply. Model fitting showed that all the MR polishing fluids exhibited shear-thinning behavior and followed the Herschel-Bulkley model. Further investigations suggested that 0.5–0.6-wt% FS was the most promising additive proportion for proper rheological and sedimentation properties, while a further increase in FS weight fraction greatly increased apparent viscosity and decreased yield stress undesirably.
KeywordsFumed silica Rheological characteristics Magnetorheological Polishing fluid
This work was financially supported by the Fundamental Research Funds for the Central Universities (M17RC00020).
Compliance with ethical standards
Conflicts of interest
The authors declare that they have no conflict of interest.
- 14.Shi F, Dai Y, Peng X, Kang N, Liu Z (2009) Study on the mechanism and arts of magnetorheological finishing (MRF) by Nano-sized diamond abrasives. Guofang Keji Daxue Xuebao 31(4):25–30 (In Chinese)Google Scholar
- 17.You W, Peng X, Dai Y (2004) MR fluids for finishing use. Guangxue Jingmi Gongcheng 12(3):330–334 (In Chinese)Google Scholar
- 18.Qiu Z, Zhang F, Dong S (2002) Research on MR fluids applied to optical glass finishing. Guangxue Jishu 28(6):497–501 (In Chinese)Google Scholar
- 19.Saraswathamma K, Jha S, Rao PV (2017) Rheological behaviour of magnetorheological polishing fluid for Si polishing materials. Today: Proceedings 4:1478–1491Google Scholar
- 28.Li K, Yang S, Li W, Gao Y (2009) Research on stability improvement of Nano-silica on fluid magnetic abrasives. Mech Manag Dev 24(5):14–15 (In Chinese)Google Scholar
- 29.Hu Z, Yan H, Wang X, Yang J (2012) Effect of thixotropy on tribological properties of magnetorheological fluid. Gongneng Cailiao 43(5):614–617 (In Chinese)Google Scholar
- 30.Cheng H, Zhang J, Feng J, Guan J, Zhang Q, Qu W (2006) The influence of nanometer lithium magnesium silicate on properties of magnetorheological fluid. Gongneng Cailiao 37(7):1166–1168 (In Chinese)Google Scholar
- 32.Fang B, Li Y, Wang G (2004) The functional mechanism and properties of fumed silica. Wujiyan Gongye 36(5):50–52 (In Chinese)Google Scholar
- 33.Yang J, Hua H, Wang X, Hu Z (2014) The effect of SiO2 particle size on the performance of magnetorheological fluids. Gongneng Cailiao 45(4):4095–4099 (In Chinese)Google Scholar
- 36.Zhou GJ, Yan ZY, Xu SX, Zhang KB (2011) Fluid mechanics (Ι)2nd edn. HIGHER EDUCATION PRESS, Beijing, pp 21–25Google Scholar
- 38.Zheng Z, Song Y and Zheng Q (2008) Interfacial Structure and Rheology of Fumed Silica Filled Polar Oligomer Nanocomposites. Gaofenzi Xuebao (3):429–453Google Scholar
- 40.Richter L, Zipser L, Lange U (2001) Properties of magnetorheological fluids. Sensors and Materials 13:385–397Google Scholar
- 44.Mohebi M, Jamasbi N, Liu J (1996) Simulation of the formation of nonequilibrium structures in magnetorheological fluids subject to an external magnetic field. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 54(5):5407–5413Google Scholar