摘要
以羰基铁粉为磁性颗粒,二甲基硅油为载液,十二烷基硫酸钠为表面活性剂,纳米SiO2和聚乙烯吡咯烷酮为添加剂,通过搅拌分散的方法制备出4份不同体积分数的羰基铁粉的磁流变液。通过自然沉降观测法和MCR-301模块化智能型流变仪检测磁流变液的沉降稳定性、零场黏度和磁流变性能。结果表明:铁粉体积分数为35%的磁流变液具有最低的沉降率、为8.6%,有最大的剪切应力、为31.33kPa,但零场黏度也相对较大、为4.4Pa·s,静置2个月后没有板结;而铁粉体积分数为20%的磁流变液具有最高的沉降率、为17.7%,最低的零场黏度、为0.8Pa·s,最小的剪切应力、为7.48kPa,静置2个月后轻微板结,轻微搅拌后又重新分散于载液中。在工程应用方面,铁粉体积分数较大的磁流变液使用效果相对较好。
Taking carboxyl iron powders as magnetic particles, dimethyl silicon oil as carrier fluid and dodecyl- Na2SO4as surfactant, the nano-SiOz and polyvinylpyrrolidone as additive, the four magneto-rheological fluids with different volume fraction of carboxyl iron powders were preparaed by the stir dispersion method. The sedimentation stability, zero-field viscosity and rheological properties of the four magneto-rheological fluids were tested and analyzed by the natural observation method and MCR-301 rotational rheometer. The results indicate that MR fluid which volume fraction of iron powder is 35% has the lowest sedimentation ratio which is 8.6%, and has the largest shear stress which is 31.33 kPa, but its zero-field viscosity is much larger than others, which is 4. 4 Pa· s. And it won＇t appears harden phenomenon after 2 months’ standing. However, MR fluid which volume fraction of iron powder is 20% has the highest sedimentation ratio which is 17.7%, it has the minimal zero-field viscosity which is 0.8 Pa· s and the minimal shear stress which is 7.48 kPa. It will be slightly hardened after 2 months＇ standing. And it can he re-dispersed in carrier fluid by gentle stir. In the field of engineering, the usage results of MR fluid with larger volume fraction of iron powder will be better.
出处
《实验技术与管理》
CAS
北大核心
2016年第4期61-64,67,共5页
Experimental Technology and Management
基金
国家自然科学基金资助项目(51077006)
辽宁省大学生创新训练项目(201511258028)
大连大学教改项目(2013G3-139)
大连大学大学生创新创业训练计划重点项目(2014093)
关键词
磁流变液
羰基铁粉
沉降率
零场黏度
流变性能
magneto-rheological fluid
earbonyl-iron-powder
sedimentation ratio
zero-field viscosity
rheological property
