Controllable SiO2 insulating layer and magnetic properties for intergranular insulating Fe-6.5wt.%Si/SiO2 composites |
| |
Authors: | Zigui Luo,Xi an Fan,Wentao Hu,Fan Luo,Guangqiang Li,Yawei Li,Xin Liu,Jian Wang |
| |
Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, China;3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;4. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou, Guangdong 510650, China;5. National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals, Guangdong Academy of Sciences, Guangzhou, Guangdong 510650, China |
| |
Abstract: | In this study, the intergranular insulating Fe-6.5wt.%Si/SiO2 soft magnetic composites (SMCs) were prepared successfully using in-situ chemical deposition followed by the spark plasma sintering (SPS) process. The effects of ammonia concentration on the microstructure and magnetic properties of the composites have been studied systematically. The Fe-6.5wt.%Si alloy particles could be well insulated by the uniform SiO2 insulating layer, and its thickness increases with increasing the ammonia concentration from 0 to 0.02?ml/g. However, further increasing the ammonia concentration to 0.03 and 0.04?ml/g would result in the discontinuous and uneven SiO2 insulating layer. Correspondingly, the saturation magnetization and effective permeability of the composite compacts first decrease and then increase with increasing the ammonia concentration from 0.00 to 0.04?ml/g, whereas the coercivity and resistivity vary in the opposite tendency. Note that the overall performances such as the frequency stability of effective permeability, higher resistivity and lower total core loss, reach the optimal value for the sample with the ammonia concentration of 0.02?ml/g. |
| |
Keywords: | Soft magnetic composites Core loss Eddy current loss In-situ chemical deposition |
本文献已被 ScienceDirect 等数据库收录! |
|