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Enhanced Magnetorheological Performance of Carbonyl Iron Suspension Added With Barium Ferrite Nanoparticle

機譯：增強羰基鐵懸浮液的磁流變性能加入鋇鐵氧體納米粒子

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Hard-magnetic barium ferrite (BF) nanoparticles with a hexagonal plate-like structure were used as an additive to a carbonyl iron (CI) microparticle-based magnetorheological (MR) fluid. The morphology of the pristine CI and CI/BF mixture particles was examined by scanning electron microscopy. The saturation magnetization and coercivity values of each particle were measured in the powder state by vibrating sample magnetometry. The MR characteristics of the CI/BF MR fluid measured using a rotation rheometer under a range of magnetic field strengths were compared with those of the CI-based MR fluid. The flow behavior of both MR fluids was fitted using a Herschel–Bulkley model, and their stress relaxation phenomenon was examined using the Schwarzl equation. The MR fluid with the BF additive showed higher dynamic and elastic yield stresses than the MR fluid without the BF additive as the magnetic field strength increased. Furthermore, the BF nanoparticles embedded in the space between the CI microparticles improved the dispersion stability and the MR performance of the MR fluid.
機譯：用六邊形板狀結(jié)構(gòu)的硬磁性鋇鐵氧體（BF）納米顆粒用作羰基鐵（CI）微粒基磁流變學(xué)（MR）流體的添加劑。通過掃描電子顯微鏡檢查原始Ci和Ci / BF混合顆粒的形態(tài)。通過振動樣品磁度測量法在粉末狀態(tài)下測量每種顆粒的飽和磁化和矯頑力。將使用旋轉(zhuǎn)流變儀在一系列磁場強度下測量的CI / BF MR流體的MR特性與基于CI的MR流體的液體。使用HERSCHEL-BOLKLEY模型安裝了兩個MR流體的流動行為，使用SCHWARZL方程檢查其應(yīng)力松弛現(xiàn)象。由于磁場強度增加，具有BF添加劑的MR流體顯示出比沒有BF添加劑的MR流體的動態(tài)和彈性屈服應(yīng)力。此外，嵌入在CI微粒之間的空間中的BF納米顆粒改善了分散穩(wěn)定性和MR流體的MR性能。

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