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Surface Modification and Refinement of Nd–Fe–B Magnetic Powder Using ITDT and Phosphoric Acid
JOM ( IF 2.6 ) Pub Date : 2021-09-03 , DOI: 10.1007/s11837-021-04850-4
Haibo Chen 1, 2 , Jingwu Zheng 1 , Xiaotian Cheng 1, 3 , Wei Cai 1 , Liang Qiao 1 , Shenglei Che 1
Affiliation  

High-temperature oxidation resistance of Nd–Fe–B magnetic powder is of great importance for its application in bonded magnet fields. In this work, the refinement and surface modification of Nd–Fe–B magnetic powders were integrated and achieved simultaneously. The effects of phosphoric acid, isopropyl tris-(dioctyl pyrophosphate acyloxy) titanate (ITDT), and the synergistic addition of them on the oxidation resistance of the powders were investigated. Also, the formation mechanism of the protective layer on the Nd–Fe–B powder surface has been proposed. The surface morphology, phase structure, oxidation resistance, and magnetic properties were studied. The results show that the synergistic surface modification exhibited optimal oxidation resistance on the refined magnetic powders. Furthermore, the obtained powders were bonded with polyphenylene sulfide to illustrate the effect of high-temperature oxidation resistance in practical application. The ITDT showed excellent protective performance for the magnetic properties at room temperature, whereas the phosphate showed an excellent oxidation resistance at high temperatures.



中文翻译:

使用ITDT和磷酸对Nd-Fe-B磁粉进行表面改性和细化

Nd-Fe-B磁粉的高温抗氧化性对其在粘结磁铁领域的应用具有重要意义。在这项工作中,Nd-Fe-B 磁粉的细化和表面改性被整合并同时实现。研究了磷酸、三(焦磷酸二辛酯酰氧基)钛酸异丙酯(ITDT)以及它们的协同添加对粉末抗氧化性的影响。此外,还提出了 Nd-Fe-B 粉末表面保护层的形成机制。研究了表面形貌、相结构、抗氧化性和磁性。结果表明,协同表面改性对精制磁粉表现出最佳的抗氧化性。此外,将所得粉末与聚苯硫醚结合,以说明实际应用中的高温抗氧化效果。ITDT在室温下表现出优异的磁性保护性能,而磷酸盐在高温下表现出优异的抗氧化性。

更新日期:2021-09-04
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