为探讨注射成型能否生产复杂外形软磁改性塑料器件,配比了聚丙烯(PP)添加不同体积含量FeSi粉末的八个组成试样,测试了试样在不同温度随剪切速率变化的黏度、导热率和比热容,在注塑机上进行了流动长度测试.同时,运用麦夸特法+通用全局优化算法对黏度数据拟合,构建Cross-WLF黏度模型进行数值计算,其结果与试验结果一致.结果表明,随FeSi含量的增加,试样的黏度升高,比热容降低,导热率升高,流动性能变差;当FeSi含量达70%时流动长度只有纯PP的15%.因此,要想获得理想复杂外形的软磁改性塑料器件,须使用较大注射压力和较高熔体温度进行注射成型.
In order to explore whether soft magnetic modified plastic can be produced by injection molding, 8 different volume fractions iron silicon powder were compounded with the polypropylene matrix. Composite material's viscosity, thermal conductivity and specific heat capacity were measured, flow ability of the composite materials were measured. Furthermore, theological data are fitted through Levenberg-Marquardt + Universal Global Optimization algorithm and the parameters of Cross-WLF viscosity model are obtained. Comparing with flow ability injection molding test results, numerical simulation results are consistent with the trend of experiments. The results show that with iron silicon increasing, viscosity is increasing, heat capacity is reducing, heat conductivity is increasing, flow ability becomes poor. When iron silicon volume fraction is 70%, flow ability is only 15% as the case of pure polypropylene. Therefore, when producing complex shape soft magnetic modified plastic part by injection molding, lager injection pressure and higher melt temperature are necessary.
参考文献
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