中文摘要：

为了改善羰基铁粉与硅油的相容性,提高磁流变液的沉降稳定性,选用硅烷偶联剂为表面改性剂,采用分散聚合法对羰基铁粉进行表面改性。通过傅立叶红外光谱、扫描电子显微镜、激光粒度分析仪等手段对改性前后羰基铁粉的结构、形貌和粒径进行了表征。同时还以改性前后的羰基铁粉为悬浮相,以硅油为分散相制备磁流变液。研究结果表明,改性后的羰基铁粉表面吸附有偶联剂,其粒径增大了2.4倍,与硅油有良好的亲和性,采用改性后的羰基铁粉可以显著改善磁流变液的沉降稳定性,同时偶联剂的添加会增大磁流变液的粘度,但是对流变性能影响较小。

英文摘要：

The surface modification of powdered carbonyl iron is necessary for the enhancement of its adhesion to silicon oil and MRF sedimentation stability by dispersion-polymerization.In this paper,silane coupling agent was used for the surface modification of carbonyl iron powder.The structure,morphologies and particle size of unmodified and modified carbonyl iron powder were characterized by fourier transform infrared spectroscopy, SEM as well as laser particle size analyzer.The results showed that carbonyl iron powder surface adsorbed coupling agent and particle size increased 2.4times while there was good affinity with silicon oil.The modified carbonyl iron powders can be used for enhancement of MRF sedimentation stability.Adding coupling agent can strengthen MRF viscosity,but it effects weakly on rheological property.