硅油基纳米Fe_3O_4-Co复合磁流体的制备及性能  

Preparation and performance of silicon-oil-based Fe_3O_4-Co nano-composite magnetic fluid

作　　者：蒙海宁[1] 赵芳霞[1] 张振忠[1] 丘泰[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《中南大学学报（自然科学版）》2014年第2期401-407,共7页Journal of Central South University:Science and Technology

基　　金：江苏省普通高校研究生科研创新计划项目(CXLX12_0429);广西科技成果转化与推广计划项目(1298009-15);江苏高校优势学科建设工程项目资助(2010年)

摘　　要：针对传统Fe3O4磁流体比饱和磁化强度低、传热性差的缺点,以采用自制直流电弧等离子蒸发设备制备的纳米钴粉为磁性颗粒,添加到硅油基Fe3O4磁流体中,研究钴粉的添加量对磁流体比饱和磁化强度、密度、黏度及摩擦学性能的影响。研究结果表明:纳米Co/Fe3O4质量比从1/3增大到6/3时,复合磁流体的密度和黏度均有一定程度提高,且纳米钴粉的加入能明显提高复合磁流体的比饱和磁化强度,当纳米钴粉的加入量达到Fe3O4的2倍时,其比饱和磁化强度由0.43 A·m2/kg增大到2.91 A·m2/kg。同时,从摩擦因数和磨斑直径的角度分析,制备的新型复合磁流体能明显改善基础油载液的摩擦学性能。此外,新型复合磁流体能显著改善机械密封件的密封性能,且具有一定的修复作用。According to low specific saturation magnetization and heat transfer of traditional Fe3O4 magnetic fluid, cobalt nanoparticles were prepared by direct current arc plasma evaporation device and then added into silicon-oil-based Fe3O4 magnetic fluid. The specific saturation magnetization, density, viscosity, and tribological properties under different cobalt nanoparticles amounts were studied. The results indicate that the density and viscosity of nano-composite magnetic fluid all increase gradually when the mass ratio of Co to Fe3O4 is improved from 1/3 to 6/3, and the specific saturation magnetization increases greatly. When the mass ratio of Co to Fe304 equals 2, the specific saturation magnetization increases from 0.43 A.m2/kg to 2.91 A.m2/kg. And moreover, the nano-composite magnetic fluid can also improve the tribological properties obviously. The composite magnetic fluid can also improve the sealing performance of the mechanical seals with repairing effect.

关 键 词：纳米复合 纳米钴粉 比饱和磁化强度 摩擦磨损性能 

分 类 号：TQ138.1[化学工程—无机化工]