基于热塑性塑料的聚合物粘合磁体中再生磁性材料用量对材料性能的影响

Magnetism Pub Date : 2024-01-15 DOI:10.3390/magnetism4010001
Uta Rösel, D. Drummer
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引用次数: 0

摘要

聚合物粘结磁体在驱动技术领域的应用日益增多,这主要是由于有关直流(DC)或同步电机励磁的新概念。为了满足对聚合物粘结磁体中硬磁性填充颗粒(主要是稀土材料)日益增长的需求,必须找到一种可用于聚合物粘结磁体的热塑性粘结磁体回收策略。回收策略中最重要的因素是填充材料,尤其是在使用稀土材料时,因为稀土颗粒资源有限且成本高昂。然而,基于热塑性塑料的粘结磁体提供了在不分离填料与基体的情况下重复使用复合材料系统的机会。大多数已知的回收策略都集中在烧结磁体上,这导致对粘结磁体回收策略的了解非常有限。本文说明了材料系统中不同数量的回收材料对材料行为和磁性能的影响,这些影响可以通过考虑不同的流动条件和不同的浇口系统来实现。回收材料是通过机械再利用碎片产生的。我们发现,在材料系统中使用高达 50%的回收材料可以达到支持效果,这只会导致材料行为发生极小的变化。此外,就回收材料而言,磁性能的变化会受到浇口系统的影响。为了减少磁性能的降低,针点的数量应尽可能少,且应位于中间位置。再生材料的填料取向受外部磁场的影响很小,因此主要取决于流动条件。随着回收材料数量的增加,这些流动条件可能会受到弹性流动比例的影响。
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Changes in Material Behavior according to the Amount of Recycled Magnetic Materials in Polymer-Bonded Magnets Based on Thermoplastics
The applications of polymer-bonded magnets are increasing within drive technology mostly because of new concepts concerning the magnetic excitation of direct current (DC) or synchronous machines. To satisfy this rising demand for hard magnetic filler particles—mainly rare earth materials—in polymer-bonded magnets, a recycling strategy for thermoplastic-based bonded magnets has to be found that can be applied to polymer-bonded magnets. The most important factor for the recycling strategy is the filler material, especially when using rare earth materials, as those particles are associated with limited resources and high costs. However, thermoplastic-based bonded magnets reveal the opportunity to reuse the compound material system without separation of the filler from the matrix. Most known recycling strategies focus on sintered magnets, which leads to highly limited knowledge in terms of strategies for recycling bonded magnets. This paper illustrates the impact of different amounts of recycling material within the material system on material behavior and magnetic properties that can be achieved by taking different flow conditions and varying gating systems into account. The recycled material is generated by the mechanical reuse of shreds. We found that a supporting effect can be achieved with up to 50% recycled material in the material system, which leads to only minimal changes in the material’s behavior. Furthermore, changes in magnetic properties in terms of recycled material are affected by the gating system. To reduce the reduction in magnetic properties, the number of pin points should be as low as possible, and they should located in the middle. The filler orientation of the recycled material is minimally influenced by the outer magnetic field and, therefore, mainly follows the flow conditions. These flow conditions are likely to be affected by elastic flow proportions with increasing amounts of recycled material.
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