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首页> 外文期刊>Journal of Materials Science >Smart composites of urethane elastomers with carbonyl iron
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Smart composites of urethane elastomers with carbonyl iron

机译：氨基甲酸酯弹性体与羰基铁的智能复合材料

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Smart composites based on carbonyl-iron particles in a polyurethane matrix, known as magnetorheological elastomers (MREs), were manufactured and studied. The influence of ferromagnetic particle content and particle arrangement in relation to an external magnetic field was investigated. Several different elastomers with different stiffnesses were used as matrices. It was found that the structure of a fabricated MRE depends on the viscosity of the matrix before curing and the flux density of the applied magnetic field. Two different magnetic field strengths were used: 0.1 and 0.3 T. The amount of carbonyl iron particles was varied from 1.5 to 33.0 vol%. Scanning electron microscopy technique was used to observe MRE microstructure. The particles' orientation and their arrangement were also investigated by vibrating sample magnetometer. A correlation was found between MRE microstructure and magnetic properties. Compression tests on cylindrical samples in the presence and absence of a magnetic field showed that a magnetic field increased the stiffness of the material. Additionally the rheological properties of MREs were tested in a magnetic field. It was found that the amount of ferromagnetic particles and their arrangement have a significant influence on the rheological properties of MREs. The highest relative change of storage modulus under 200 mT magnetic field, equal to 282%, was recorded for samples with 11.5 vol% of particles.
机译：制造并研究了基于聚氨酯基体中羰基铁颗粒的智能复合材料，称为磁流变弹性体（MRE）。研究了铁磁粒子含量和粒子排列相对于外部磁场的影响。几种具有不同刚度的不同弹性体被用作基质。已经发现，所制造的MRE的结构取决于固化之前的基体粘度和所施加的磁场的通量密度。使用了两种不同的磁场强度：0.1 T和0.3T。羰基铁颗粒的量在1.5到33.0 vol％之间变化。使用扫描电子显微镜技术观察MRE的微观结构。还通过振动样品磁力计研究了颗粒的取向及其排列。发现MRE的微观结构与磁性能之间存在相关性。在有磁场和无磁场的情况下，对圆柱形样品的压缩试验表明，磁场增加了材料的刚度。另外，在磁场中测试了MRE的流变特性。已经发现，铁磁颗粒的数量及其排列对MRE的流变性具有重要影响。对于含11.5％（体积）颗粒的样品，在200mT磁场下的储能模量的最高相对变化为282％。

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