黏结磁性材料复合体系流动缺陷的研究  

Study on Flow Drawback of Bonded Magnetic Material

作　　者：宋大余[1] 刘颖[2] 涂铭旌[2] 

机构地区：[1]四川师范大学化学与材料学院,四川成都610068 [2]四川大学材料科学与工程学院,四川成都610065

出　　处：《塑料工业》2006年第11期60-62,65,共4页China Plastics Industry

基　　金：国家"863计划"项目的部分内容;课题编号为2001AA324030

摘　　要：利用双料筒毛细管流变仪,讨论了在高磁性粉末装载量下黏结磁性材料复合熔体流动缺陷问题。实验表明,黏结磁性材料复合熔体具有超高的流动黏度,在毛细管内受压流动时流动行为与管径尺寸相关。在小管径时容易产生“时黏时滑”、“压力振荡”等流动不稳定现象。分析认为,黏结磁性材料复合熔体体系是低量黏结剂和超高量的磁性粉末共混合体系,在小管径毛细管内受压流动时由于粉末粒子自由转动空间较小,产生剪切迁移行为不均匀,集聚在管壁处的低黏度物料量不稳定而引起管壁滑移等不稳定流动缺陷。The fluidity drawbacks of bonded magnetic composite loaded with high powder fraction were discussed by means of double die capillary rheometer. The results indicated the composite melts took on super high viscosity and its flow behaviors were related to the tube die diameters of the capillary rheometer. As using a small diameter tube, the melt instabilities easily came into being. This phenomenon might be due to the combination of interfacial slip and cohesive failure. Because the composite melt system was a highly powder filled system, the magnetic powder particles were hardly rotated in a small tube and the restrained particles induced disproportion behaviors of shear transference.

关 键 词：功能材料 黏结磁性材料 流动缺陷 双料简毛细管流变仪 

分 类 号：TM271[一般工业技术—材料科学与工程]