CAJ | 학술논문

分别以不同粒径的 Si O 2粒子作为触变剂，以羰基铁粉为磁性颗粒，制备了矿物油基磁流变液。通过测量零场粘度、流变曲线、沉降率，以及摩擦系数等，考察了Si O 2的粒径对磁流变液流变特性、稳定性以及摩擦学性能的影响。实验结果表明，(1)中等粒径的Si O 2作为触变剂会明显增加磁流变液的零场粘度；(2)小粒径 SiO2粒子的填补空隙作用，使得磁流变液在强磁场下磁致剪切应力明显增强；(3)磁流变液的沉降稳定性随着粒径的增大而明显改善，再分散性能下降；(4)较大粒径(100 nm)的SiO2粒子的磁流变液表现出良好的减摩性能。
분별이불동립경적 Si O 2입자작위촉변제，이탄기철분위자성과립，제비료광물유기자류변액。통과측량령장점도、류변곡선、침강솔，이급마찰계수등，고찰료Si O 2적립경대자류변액류변특성、은정성이급마찰학성능적영향。실험결과표명，(1)중등립경적Si O 2작위촉변제회명현증가자류변액적령장점도；(2)소립경 SiO2입자적전보공극작용，사득자류변액재강자장하자치전절응력명현증강；(3)자류변액적침강은정성수착립경적증대이명현개선，재분산성능하강；(4)교대립경(100 nm)적SiO2입자적자류변액표현출량호적감마성능。
A novel mineral oil-based magnetorheological fluids was prepared with carbonyl iron powder for mag-netic particle and SiO2 particles as thixotropic agent,the effect of particle size of SiO2 on magnetorheology,sta-bility and tribological performance of magnetorheologicalfluids was studied by measuring the zero field viscosi-ty,rheological curve,sedimentation rate,and the friction coefficient et al.The results indicated that the SiO2 with middle particle size as a thixotropic agent could significantly improve the zero-field viscosity,and field-in-duced shear stress was enhanced with SiO2 in small particle size.Sedimentation stability was improved signifi-cantly with the increase of the particle size of SiO2 ,but the dispersion performance was poor with larger appar-ent viscosity of sediment.In addition the magnetorheological fluid showed good anti-friction performance with average SiO2 particle size in 15 and 100 nm.