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.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
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)
关键词
纳米复合
纳米钴粉
比饱和磁化强度
摩擦磨损性能
nano-composite
cobalt nanoparticles
specific saturation magnetization
tribological properties
