Improvement of coercivity and corrosion resistance of Nd-Fe-B sintered magnets by doping aluminium nano-particles

• Published in: Journal of rare earths Vol. 31; no. 1; pp. 65 - 68
• Main Author: 刘卫强 孙超 岳明 孙浩 张东涛 张久兴 衣晓飞 陈静武
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2013
• Subjects: Al nano-particles; Aluminum; coercivity; corrosion resistance; Doping; Ferrous alloys; Magnetic materials; Magnets; Nanomaterials; Nanostructure; Nd-Fe-B; Nd-Fe-B永磁体; Rare earth metals; rare earths; 抗氧化性能; 烧结Nd-Fe-B磁体; 烧结方法; 矫顽力; 纳米颗粒; 耐腐蚀性能; 过掺杂; coercivity; Al nano-particles; Nd-Fe-B; corrosion resistance; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(12)60236-1

Nd-Fe-B permanent magnets with a small amount of A1 nano-particles doping were prepared by conventional sintered method. Effect of AI content on magnetic property, corrosion resistance and oxidation properties of the magnets were studied. Inves- tigation showed that the coercivity rose gradually, while the remanence decreased simultaneously with increase of A1 doping amount. Further investigation revealed that most A1 element diffused into the main phase and some A1 element diffused into the Nd-rich phase The autoclave test results showed that the corrosion rate of the magnets decreased with A1 content increasing. After oxidation, the maximum energy product losses of the magnets with 0.0 wt.% and 0.2 wt.% AI nano-particles doping were 6.13% and 3.99%, respec- tively. Therefore, A1 nano-particles doping was a promising way to enhance the coercivity and corrosion resistance of sintered Nd-Fe-B magnet.