摘要
用微乳液法制备了明胶包裹的羰基铁粉-铁氧化物复合超细微粒．SEM测试表明：微粒为明胶包裹球形超细微粒．微球的粒径为3～10μm。该复合微粒的比饱和磁化强度σs=130.9Am^2/Kg，矫顽力Hc=5216．98A/m，剩磁r=4．98Am^2/kg，具有接近软磁体的性质．在剪切应力测试中，外场为0.5T时，剪切应力达到70kPa。将其用于制备磁流变液，在较低的磁场强度下有较大的磁流变效应，沉降稳定性好于用纯羰基铁粉制成的磁流变液．
Gelatin-carbonyl iron composite particle was prepared with the micro emulsion method. The investigations by SEM show that the ultra fine particles are spheroids coated by gelatin. Their average sizes are 3-10μm. The specific saturation magnetization σs= 130.9Am^2/kg, coercivity Hc=5126.98A/m, and residual magnetism r=4.98Am^2/kg for the composite particles. It shows the particles possess properties of soft magnetic. The yield stress of MRF with composite particle reaches 70kPa at 0.5T magnetic field strength. Magneticrheological effects are superior in lower magnetic field intensity and the subsidence stability of the MRF is excellent compared with pure carbonyl iron powder.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A03期1214-1216,共3页
Journal of Functional Materials
关键词
微乳液
复合微粒
明胶
羰基铁粉
剪切应力
emulsion
composite particle
gelatin
carbonyliron
yield stress
