不同磁性粉末装载量和磁性粉末粒度对粘结NdFeB注射、挤出成型流动性能的影响  

The impacts of magnetic powder sizes and contents to the fluidity of bonded NdFeB for injection molding and extrusion

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610064

出　　处：《功能材料》2005年第9期1337-1340,1344,共5页Journal of Functional Materials

摘　　要：利用转矩流变仪和毛细管流变仪,讨论了不同的磁性粉末装载量与磁性粉末粒度对粘结NdFeB熔料流动性能的影响,建立了在不规则的粉末表面形态和复杂的粉末粒度分布下其固相浓度与熔料粘度的物理数学模型。粘结NdFeB熔料流动粘度与其粉末装载量呈现非线性的增长关系;在固定的固相浓度以及所讨论的粉末粒径范围内,熔料体系的粘度与固体粉末粒度呈负相关关系,体系内的作用力主要为液相粘结剂对固相磁性粉末粒子的粘性力;通过粘结Nd-FeB挤出成型时的功率消耗、转矩大小以及挤出物料表观质量等,分析成型设备的流道结构,并比较其与聚合物成型设备的异同。In this essay, by a torque rheometer and a capillary rheometer, the fluidity of bonded NdFeB melts loading different powder fractions and powder sizes were discussed,and the mathematical models of powder fractions and melt viscosity of bonded NdFeB dispersing irregular shape and complicated size distribution of magnetic powder have been studied. The flow behaviors of bonded NdFeB melts are determined by the filler particles fraction, shape and size. Viscosity of the melt systems increases nonlinearly with the quantities of powder fraction and becomes infinity at the upper filled limitation; whereas decreases with the powder size. The interactions in this high-filled system are mainly the filler-polymer interaction. The extruding of bonded NdFeB has been investigated to provide the design of machine for bonded NdFeB through the power consumption of machine and torque of screw and the fabrication surface quality.

关 键 词：功能材料 粘结NDFEB 注射成型 挤出成型 

分 类 号：TM272[一般工业技术—材料科学与工程]