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Effect of heat treatment in air on surface composition of iron-phosphate based soft magnetic composite components

机译:空气中热处理对磷酸铁基软磁复合材料表面成分的影响

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摘要

Soft magnetic composite materials (SMC) manufactured by conventional powder metallurgical techniques for electromagnetic applications constitute individually encapsulated ferromagnetic powder particles with an insulating surface layer, bonded together into 3D finished structures. The production procedure includes compaction of the SMC base powder mixed with a lubricant substance and a post-annealing treatment that aims to relieve the stresses induced in the component during pressing. In the present study, the effect of the heat treatment process to the nature of the insulating layer was investigated under different temperature regimes using analytical techniques. Its surface chemistry was determined based on the XPS depth profiling technique, and its morphology and structure were evaluated using HR-SEM and XRD. Differences between interior and exterior areas of the samples suggested the development of an oxide scale in the outer regions that prevents its further bulk oxidation at temperatures above 500 ℃, while below that temperature incomplete de-lubrication takes place.
机译:通过常规粉末冶金技术制造的用于电磁应用的软磁复合材料(SMC)构成具有绝缘表面层的单独封装的铁磁粉末颗粒,它们粘结在一起成为3D成品结构。生产程序包括压制与润滑剂物质混合的SMC基础粉末和旨在减轻冲压过程中在组件中引起的应力的后退火处理。在本研究中,使用分析技术研究了热处理工艺对绝缘层性质的影响。根据XPS深度剖析技术确定其表面化学性质,并使用HR-SEM和XRD评估其形态和结构。样品内部和外部区域之间的差异表明,在外部区域出现了氧化皮,从而阻止了其在高于500℃的温度下进一步本体氧化,而在低于该温度的情况下会发生不完全脱脂。

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