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Simultaneous improvements of effective magnetic permeability, core losses and temperature characteristics of Fe-Si soft magnetic composites induced by annealing treatment
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-09-25 , DOI: 10.1016/j.jallcom.2021.162100
Kechao Lu 1, 2, 3 , Xin Liu 1, 2, 3 , Jian Wang 1, 2, 3 , Tiansheng Yang 1, 2, 3 , Jia Xu 1, 2, 3
Affiliation  

In this paper, silicone-resin coating Fe-Si soft magnetic composites (SMCs) with high magnetic permeability, low core losses and good temperature/frequency stability were successfully fabricated. Microstructural characterizations suggest that the thin, continuous and heat-resistant silicone-resin coatings are constructed surrounding magnetic particles. The effective permeability of SMCs is significantly improved to 139.7 and 153.6 when the stress relief annealing temperatures increase to 700 °C and 800 °C, and meanwhile their core losses are obviously reduced to 657 mW/cm³ and 632 mW/cm³ (0.1 T/50 kHz), respectively. Loss-separation analyses confirm that hysteresis losses predominate in the total core losses within quite wide frequency ranges that depend on annealing temperatures, and higher temperature annealing can more effectively decrease hysteresis losses due to larger residual stress relaxation, which contributes to the simultaneous improvements of permeability and core losses. However, for the SMCs annealed at 800 °C, due to partially decomposed silicone-resin coatings, the strong eddy-current effects at high frequency region will cause sharply increased core losses and slightly decreased frequency stability of permeability. Noticeably, the temperature-dependent behaviors of core losses and permeability of Fe-Si SMCs can be also effectively tuned by optimizing annealing treatment.



中文翻译:

退火处理诱导Fe-Si软磁复合材料的有效磁导率、磁芯损耗和温度特性同时改善

本文成功制备了具有高磁导率、低磁芯损耗和良好温度/频率稳定性的硅树脂涂层铁硅软磁复合材料(SMCs)。微观结构特征表明,薄的、连续的和耐热的硅树脂涂层是围绕磁性颗粒构建的。当去应力退火温度升高到700℃和800℃时,SMCs的有效磁导率显着提高到139.7和153.6,同时其磁芯损耗明显降低到657 mW/cm³和632 mW/cm³(0.1 T/ 50 kHz),分别。损耗分离分析证实,在取决于退火温度的相当宽的频率范围内,磁滞损耗在总磁芯损耗中占主导地位,更高的温度退火可以更有效地降低由于较大的残余应力松弛而导致的磁滞损耗,这有助于磁导率和磁芯损耗的同时改善。然而,对于800℃退火的SMC,由于硅树脂涂层部分分解,高频区的强涡流效应会导致磁芯损耗急剧增加,磁导率频率稳定性略有下降。值得注意的是,Fe-Si SMC 的磁芯损耗和磁导率的温度相关行为也可以通过优化退火处理进行有效调整。高频区强烈的涡流效应会导致磁芯损耗急剧增加,磁导率频率稳定性略有下降。值得注意的是,Fe-Si SMC 的磁芯损耗和磁导率的温度相关行为也可以通过优化退火处理进行有效调整。高频区强烈的涡流效应会导致磁芯损耗急剧增加,磁导率频率稳定性略有下降。值得注意的是,Fe-Si SMC 的磁芯损耗和磁导率的温度相关行为也可以通过优化退火处理进行有效调整。

更新日期:2021-10-02
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