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稀土改性二氧化钛电流变液的性能 被引量:20

PROPERTIES OF TITANIA ELECTRORHEOLOGICAL FLUIDS MODIFIED BY RARE EARTH
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摘要 用溶胶-凝胶法制备了稀土元素改性的二氧化钛微粉,利用 DSC、TG、XRD等表征微粉,测试了微粉的介电性能,用微粉和甲基硅油配制了无水电流变液.流变学测量结果表明掺杂改性后的二氧化钛电流变液具有比在相同制备条件下所得纯二氧化钛配制电流变液强得多的电流变效应,典型的颗粒/硅油体积比为35%的电流变液,在25℃、直流3kV/mm、剪切速率为1.441s^(-1)条件下的剪切强度可达1.7kPa,电流密度小于10μA/cm~2,零场粘度为3~SPa·s.稀土的掺杂量对电流变效应影响非常明显,存在一个稀土元素的最佳含量范围讨论了电流变液的剪切应力与电场强度、剪切速率的关系。 The water-free Electrorheological fluids (ERF), made of modified titania (TiO2) doped with rare earth (RE), were synthesized by means of sol-gel technique. The behavior of the suspensions of modified titania particles in silicone with a 35% by volume were investigated under DC electric fields. Much stronger ER effect in modified titania ERF than that of pure titania/silicone oil, which was synthesized by the same mean, is observed. In the electric fields of 3kV/mm, when shear rate of 1.441 s-1 were applied to the ERF at 25 ℃, the shear stress can be 1.7 kPa, while the current density was only 10μA/cm2 and the zero viscosity of the ERF was 3-5 Pa.s. RE/Ti mole ratio has an important influence on the ER effects. The thermal characteristic of modified titania was investigated by DSC and TG, the crystal structure of pure and doped titania particles were investigated by XRD. Relationships between shear stress and electric fields. between shear stress and shear rate were discussed.
机构地区 西北工业大学
出处 《材料研究学报》 EI CAS CSCD 北大核心 2000年第6期604-608,共5页 Chinese Journal of Materials Research
基金 国家自然科学基金重点资助项目!59832090 航空基金资助项目!98G53107.
关键词 电流变液 二氧化钛 SOL-GEL 稀土改造 electrorheological fluids, rare earth, titania, sol-geH
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