Properties of Fe2SiO4/SiO2 coated Fe-Si soft magnetic composites prepared by sintering Fe-6.5wt%Si/Fe3O4 composite particles

被引：29
作者：
Luo, Zigui [1 ,3 ]
Fan, Xi'an [1 ,2 ,3 ]
Hu, Wentao [1 ,3 ]
Luo, Fan [1 ,3 ]
Wang, Jian [4 ,5 ]
Wu, Zhaoyang [6 ]
Liu, Xin [4 ,5 ]
Li, Guangqiang [1 ,3 ]
Li, Yawei [1 ,2 ]
机构：
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China
[2] Wuhan Univ Sci & Technol, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Wuhan 430081, Peoples R China
[3] Wuhan Univ Sci & Technol, Minist Educ, Key Lab Ferrous Met & Resources Utilizat, Wuhan 430081, Peoples R China
[4] Guangdong Acad Sci, Guangdong Inst Mat & Proc, Guangzhou 510650, Peoples R China
[5] Guangdong Acad Sci, Natl Engn Res Ctr Powder Met Titanium & Rare Met, Guangzhou 510650, Peoples R China
[6] Anhui Univ Technol, Minist Educ, Key Lab Met Emiss Reduct & Resources Recycling, Maanshan 243002, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2020年 / 499卷
基金：
中国国家自然科学基金;
关键词：
Soft magnetic composites; Redox reaction; Fe2SiO4/SiO2 insulating layer; Fe3O4 coating layer; Core loss; LOSS SEPARATION; MNZN FERRITE; CORE LOSS;
D O I：
10.1016/j.jmmm.2019.166278
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, Fe2SiO4/SiO2 coated Fe-Si soft magnetic composites (SMCs) have been prepared successfully via ball milling Fe-6.5wtWoSi/Fe3O4 composite particles combined with subsequent spark plasma sintering (SPS) process. The formation mechanism of Fe2SiO4/SiO2 insulating layer and effect of Fe3O4 coating content on the microstructure and properties for the Fe-Si SMCs were investigated in detail. It is interesting that high temperature SPS process would lead to the occurrence of redox reactions between Fe3O4 and Si from Fe-Si alloy cores, and resulted in the transformation from Fe3O4 coating layer to Fe2SiO4/SiO2 insulating layer. As a consequence, the novel Fe-Si SMCs exhibited superior performances including high saturation magnetization (190.4 emu/g) and low core loss (9.02 mW/cm 3 at 10 kHz) decreased by 89.1% compared to that of the un-coated Fe-Si SMCs (83.08 mW/cm(3) at 10 kHz). The results indicated that the method of preparing insulating layer by the redox reactions is a simple and effective way to synthesize new SMCs with high performance for electro-magnetic energy conversion equipments.
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页数：7
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