NdFeB/PA复合材料流变特性研究  

Rheological Behaviors of NdFeB/PA Composites

作　　者：宋大余[1] 刘颖[1] 叶金文[1] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2005年第1期57-60,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家"863计划"资助项目(2001AA324030)

摘　　要：磁性材料的注射成型是高效生产精密复杂、带嵌件磁体的近净成型新技术,粘结钕铁硼注射喂料由于其超高的粉末装载量而流动性能极差。应用高压毛细管流变仪,研究NdFeB粉末装载量90%时粘结磁性材料的流变特性。实验表明,NdFeB/PA的喂料体系流动为非牛顿型流动体系,遵从假塑性液体的流动规律,具有超高的熔体粘度;利用非线性回归技术对流变参数予以拟合,得到NdFeB/PA复合料的流动本构模型。本实验结果对粘结NdFeB注射成型时的工艺参数确定、模具和机械设计以及加工质量的控制等具有定性或定量的指导意义。The injection molding of magnetic material could cost-effectively mass-produce net shape magnets with accurate dimensional tolerances and complicated geometries. However, the magnetic injection feedstocks hardly flow for its ultra-loaded powders. The rheological behaviors of bonded magnetic materials loading 90% NdFeB powders were investigated by means of a capillary rheometer. The experimental results show that the bonded NdFeB mixture is a pseudoplastic fluid of ultrahigh melt viscosity. The rheological parameter curves were fitted with a rheological equation of state by nonlinear regression which can describe the flow model of NdFeB/PA composites fluid. It provides some theoretical basis for the determination of suitable processing parameters and the design of machinery for the bonded NdFeB.

关 键 词：注射成型 喂料 PA 熔体粘度 毛细管流变仪 流变特性 装载量 粉末 研究 实验 

分 类 号：TQ320[化学工程—合成树脂塑料工业] TQ172