Abstract In this work, dense and pinhole-free poly-para-xylylene (PPX) with high thermal stability, high insulating property and high lubricity has been designed as coating layer for Fe-based amorphous powder. Three ultra-thin PPX layers have been successfully deposited on the surface of FeSiBPNbCr amorphous powder via chemical vapor deposition (CVD) polymerization. The micromorphology and chemical structure of the PPX layer on the powder surface, as well as the conversion mechanisms, has been investigated systematically. Several methods have been used to estimate the amount and thickness of PPX layers. The corresponding amorphous powder cores (AMPCs) were also prepared. With the increasing thickness of the PPX layer, the saturation magnetization (Ms) of the powder decreased slightly but the magnetic flux density (Bs) of the AMPCs kept at a similar level thanked to the enhanced green density. In addition, the DC bias performance was improved and core loss (Pcv) was reduced. Compare with other coating materials like epoxy and silicon resin, the PPX layer provided better insulation and higher lubricity for the AMPCs, thus reduced the Pcv and improved the DC bias performance. The AMPCs coated by PPX-3 exhibited excellent comprehensive soft magnetic properties, which were promising for high-power and high-frequency applications.

中文翻译：

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通过化学气相沉积改善软磁性能的聚对二甲苯增强铁基非晶粉末磁芯

摘要 在这项工作中，设计了一种具有高热稳定性、高绝缘性和高润滑性的致密无针孔聚对二甲苯（PPX）作为铁基非晶粉末的涂层。通过化学气相沉积（CVD）聚合，三个超薄 PPX 层已成功沉积在 FeSiBPNbCr 非晶粉末表面。已经系统地研究了粉末表面上 PPX 层的微观形态和化学结构，以及转化机制。已使用多种方法来估计 PPX 层的数量和厚度。还制备了相应的非晶粉末磁芯（AMPC）。随着PPX层厚度的增加，粉末的饱和磁化强度 (Ms) 略有下降，但由于生坯密度的提高，AMPCs 的磁通密度 (Bs) 保持在相似的水平。此外，直流偏置性能得到改善，磁芯损耗 (Pcv) 降低。与环氧树脂和硅树脂等其他涂层材料相比，PPX层为AMPC提供了更好的绝缘性和更高的润滑性，从而降低了Pcv并提高了直流偏置性能。PPX-3包覆的AMPCs表现出优异的综合软磁性能，有望用于大功率和高频应用。PPX层为AMPC提供了更好的绝缘性和更高的润滑性，从而降低了Pcv并提高了直流偏置性能。PPX-3包覆的AMPCs表现出优异的综合软磁性能，有望用于大功率和高频应用。PPX层为AMPC提供了更好的绝缘性和更高的润滑性，从而降低了Pcv并提高了直流偏置性能。PPX-3包覆的AMPCs表现出优异的综合软磁性能，有望用于大功率和高频应用。