Fe基软磁复合材料的断裂性能研究

发布时间：2018-07-17 18:06

【摘要】：基于两步热处理法进行了Fe基软磁复合材料的制备研究,成功制备出具有较高抗弯强度的软磁复合材料(SMCs),研究并分析了微观组织结构与抗弯强度的内在关系。将Fe粉表面钝化增加了Fe与具有优异介电性能的有机硅环氧树脂的结合键,提高了材料的抗弯强度,其强度达到45.3 MPa。能谱(EDS)及有限元方法(FEM)分析表明,SMCs制备中产生的孔洞及裂纹主要分布在树脂层及树脂-Fe界面,在外加载荷作用下,裂纹影响孔洞外缘的应力分布,并朝着共同断裂失效的方向扩展,故对SMCs的强度产生不利影响。为了提高SMCs的强度,需要保证树脂涂覆完整,并进一步提高树脂层本身及树脂与纯铁的粘结强度,采用热压方式减少材料中的孔洞数量。
[Abstract]:Based on the two-step heat treatment, the preparation of Fe-based soft magnetic composites was studied. The soft magnetic composites (SMCs) with high bending strength were successfully prepared. The relationship between microstructure and flexural strength was studied and analyzed. The surface passivation of Fe powder increases the bond between Fe and organosilicon epoxy resin with excellent dielectric properties, and improves the bending strength of the material, the strength of which is up to 45.3 MPA. Energy dispersive spectroscopy (EDS) and finite element method (FEM) analysis show that the pores and cracks produced in the preparation of SMCs are mainly distributed in the resin layer and resin-Fe interface. Under the applied load, the cracks affect the stress distribution of the outer edge of the pores. And it extends to the direction of common fracture failure, so it has a negative effect on the strength of SMCs. In order to improve the strength of SMCs, it is necessary to ensure the integrity of the resin coating and further increase the bonding strength of the resin layer and the resin with pure iron. The hot pressing method is used to reduce the number of pores in the material.
【作者单位】：西安科技大学理学院;西安交通大学机械结构强度与振动国家重点实验室;
【基金】：国家自然科学基金(11502196) 中国博士后资助项目(2015M580865) 陕西省教育厅资助项目(15JK1483) 陕西省博士后资助项目(2016BSHEDZZ77)
【分类号】：TB33

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