微米铁粉填充硅橡胶复合材料的压阻性能研究

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Silicon rubber filled with aligned iron powders through the process of magnetic field assisted curing was prepared.The resistance dependence upon filler content and pressure was tested.The results show the composite samples of resistance of more than 1010Ω exhibit negative piezoresistivity,while those of resistance of less than 1010Ω exhibit positive piezoresistivity;the silicon rubber filled with 10%~50% iron powders in weight has a sharp increase in resistance up to 3~5 orders of magnitude close to 0.2 MPa,but the system containing 50% filler obtained under a 0.2T magnetic field exhibits a linear positive piezoresistivity.The underlying mechanism is correlated with the diversity in configuration of aligned microstructure in the rubber induced by magnetic field.利用磁场辅助硫化工艺,制备了含有排列的微米铁粉的硅橡胶复合材料,测量了体系的压阻特性。结果表明,该复合材料显示丰富的压阻特性,初始电阻大于1010Ω的体系显示负压阻特性,而小于1010Ω的体系显示正压阻特性;填充了10,20,50（质量分数）铁粉的硅橡胶在加载压力0.2MPa前后出现正压阻渗流转变,电阻变化达103~105Ω个量级,然而,质量分数φ=50,磁感应强度B=0.2T体系显示线性正压阻特性。初步研究认为,体系压阻行为的复杂性与磁场在基胶中诱导的导电路径构象的多样性有关。