Abstract The present work demonstrates the high-frequency core loss performance of Fe-based amorphous and nanocrystalline powder cores, initially produced by gas atomised powder, consolidated using sieved particles ≤20 µm, and isolated by a precise insulating layer of polymer to limit the inter- and intra-particle eddy currents to attain enhanced performance. The large glass forming ability (GFA) of the gas atomised powder, reflected by different glass forming instruments, such as the supercooled region (ΔTX = 54 °C) and the reduced glass transition temperature (Trg = 0.56), is consistent with the substantial amorphisation capability of the alloy. To the best of our knowledge, this is the first-ever report to reveal a large ΔTX in the Finemet-type alloy powders, an essential parameter to gas-atomise the amorphous powders with significantly lower cooling rates compared to the melt-spun ribbons. Further, subsequent annealing of the amorphous powders, between the exothermic events guided by differential scanning calorimetry (DSC), lead to the growth of a fine nanocrystalline structure of grains ≤15 nm, thanks to the positive enthalpy of mixing of Cu with the constituents to act as a nucleation agent, to retain the excellent soft magnetic properties. The DC soft magnetic properties of the powders were significantly improved on thermal annealing, confirmed by hysteretic loops, quantified by reduced coercivity HC

中文翻译：

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用于高频功率转换的新型铁基非晶和纳米晶粉末磁芯

摘要 目前的工作证明了铁基非晶和纳米晶粉末磁芯的高频磁芯损耗性能，最初由气体雾化粉末制成，使用≤20 µm 的筛分颗粒进行固结，并由精确的聚合物绝缘层隔离以​​限制相互之间的相互作用。 - 和粒子内涡流以获得增强的性能。气体雾化粉末的大玻璃成形能力（GFA），通过不同的玻璃成形仪器，如过冷区（ΔTX = 54 °C）和降低的玻璃化转变温度（Trg = 0.56），与显着一致。合金的非晶化能力。据我们所知，这是有史以来第一次揭示 Finemet 型合金粉末中存在大 ΔTX 的报告，与熔纺带相比，以显着较低的冷却速率对无定形粉末进行气体雾化的基本参数。此外，在差示扫描量热法 (DSC) 引导的放热事件之间，无定形粉末的后续退火导致晶粒≤15 nm 的精细纳米晶体结构的生长，这要归功于 Cu 与成分混合的正焓，以作为成核剂，保持优良的软磁性能。粉末的直流软磁性能在热退火后得到显着改善，由磁滞回线证实，通过降低矫顽力 HC 量化 由于Cu与作为成核剂的成分混合的正焓，导致晶粒≤15nm的精细纳米晶结构的生长，以保持优异的软磁性能。粉末的直流软磁性能在热退火后得到显着改善，由磁滞回线证实，通过降低的矫顽力 HC 量化 由于Cu与作为成核剂的成分混合的正焓，导致晶粒≤15nm的精细纳米晶结构的生长，以保持优异的软磁性能。粉末的直流软磁性能在热退火后得到显着改善，由磁滞回线证实，通过降低矫顽力 HC 量化