磁性MH/Fe_3O_4/SR复合材料的耐热机理及摩擦性能

以SR、纳米Fe3O4和纳米MH为主要原料制备MH/Fe3O4/SR磁性橡胶复合材料。研究纳米Fe3O4和纳米MH不同配比时,复合材料的物理力学性能变化、耐热以及摩擦性能变化。结果表明:纳米粒子在SR基体中分布较为均匀,不同配比的Fe3O4/MH能够有效改善硅橡胶的物理力学性能。当配比20phrMH/10phrFe3O4时,复合材料的拉伸强度、伸长率有所改善,性能较普通硅橡胶提高了5%左右。随着纳米MH与Fe3O4填料填充量不断加大,复合材料耐热性能不断提高,摩擦因数有效降低。当纳米添加量为30phrMH/10phrFe3O4时,复合材料的分解温度提高为450℃,当纳米添加量为20phrMH/20phrFe3O4时,复合材料的摩擦因数降为0.52。

Heat-resistant Mechanism and Friction Property of Magnetic MH/Fe3 O4/SR Composites

The MH/Fe3 O4/SR magnetic rubber composites were prepared with SR,nano-Fe3 O4 and nano-MH as raw materials.The friction,heat-resistant,physical and mechanical properties of the MH/Fe3 O4/SR composites were studied using different proportions of nano-Fe3 O4 and nano-MH.The results show that nano particles are well distributed in the silicone rubber matrix.The physical and mechanical properties of silicone rubber are effectively improved by different ratios of Fe3 O4/MH. When the ratio is 20phrMH/10phrFe3 O4 ,the tensile strength and elongation of the composites are somewhat improved,increase by 5%,compared with common silicone rubber.With the increase of the addition of nano MH and Fe3 O4 ,the heat-resistant and friction properties of composites are continu-ously improved, the friction coefficient is effectively demoted. When the ratio is 30phrMH/10phrFe3 O4 ,the decomposition temperature of the composites increases to 450℃.When the ratio is 20phrMH/20phrFe3 O4 ,the friction coefficient of the composites is demoted to 0.52.