铁硅铝磁粉芯氧化腐蚀的研究.docVIP

铁硅铝磁粉芯氧化腐蚀的研究 金属材料工程 学生：郑烺 指导教师：李军 摘要：本文主要对铁硅铝磁粉芯的氧化、加速氧化以及氧化后磁导率的变化进行了研究。通过对铁硅铝磁粉芯在不同温度、不同加速氧化方式下氧化情况的探究，研究了铁硅铝磁粉芯氧化速率随温度的变化情况以及KMnO4、NaCl、NaF和它们的混合物对铁硅铝磁粉芯氧化的加速情况，以期得到铁硅铝磁粉芯的最佳氧化温度和最佳的促进氧化方式。实验结果表明：通过对铁硅铝磁粉芯氧化后表面形貌的微观分析和磁导率变化的分析得知，NaCl、NaF在高温下对铁硅铝磁粉芯的腐蚀能够加速它的氧化，并且NaF的加速效果要强得多。同时，NaCl和NaF的混合物虽然加速效果要比同质量的NaF略差，但混合物加速氧化开始的温度要比纯NaF低很多。铁硅铝磁粉芯发生氧化后其磁导率下降，并且随着氧化温度的升高，氧化程度的提高，磁导率下降得越严重。 关键词： 铁硅铝磁粉芯 加速氧化 磁导率 NaCl NaF The Oxidation and Corrosion of Fe-Si-Al Magnetic Powder Core Metals material engineering Student: Lang Zheng　　Supervisor: Jun Li Abstract：Fe-Si-Al magnetic powder core and the permeability change of oxidative core have been studied. In order to get the optimal oxidation temperature and the best way to promote oxidation, we studied the oxidation rate of Fe-Si-Al magnetic powder core at different temperature and the effect of KMnO4、NaCl and NaF which were imported in the oxidation condition. By analyzing the SEM images、XRD and permeability changes after oxidation, the experimental results showed that: The corrosion of NaCl and NaF at high temperature can accelerate the oxidation of the Fe-Si-Al magnetic powder core and the acceleration effect of NaF is much stronger. Meanwhile, the acceleration effect of the mixture of NaCl and NaF is slightly worse than the pure NaF at the same quality, but the temperature begins to accelerate oxidation of the mixture is much lower than the pure NaF. After the oxidation, Fe-Si-Al magnetic powder core decreased its permeability. The oxidation temperature higher, the degree of oxidation increased deeper and the permeability decreased the more. Keywords : Fe-Si-Al magnetic powder core acceleration of oxidation permeability NaCl NaF 目录： 1 1.1 软磁材料概述 1 1.1.1 软磁材料的发展 1 1.1.2 一些常用的软磁材料 1 1.1.3 各种软磁材料优缺点对比 2 1.2 Fe-Si-Al 磁粉芯 2 1.2.1 Fe-Si-Al 磁粉芯概述 2 1.2.2 Fe-Si-Al 磁粉芯的发展 2 1.2.3 Fe-Si-Al粉末的制备 2 1.3 铁及铁基合金氧化与腐蚀的研究 4 1.3.1 高温下水蒸气腐蚀 4 1.3.2高温下氯腐蚀 4 1.3.3 高温下氟腐蚀 5 1.3.4 高温下硫腐蚀 6 1.4对氧化层结构的研究 6 1.4.1 纯铁高温氧化生成的氧化层