Enhanced corrosion resistance of NdFeB type permanent magnet coated by a dual layer of either Ti/Al or Ni/Al intermetallics
Publication in refereed journal

香港中文大學研究人員

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其它資訊
摘要NdFeB magnets were coated with a dual layer of either Ti/Al or Ni/Al by thermal evaporation. When the coated samples were annealed at 400 degrees C, intermetallic reactions occurred within these coatings, between Ti and Al, and between Ni and Al. When the samples were annealed at 500 degrees C, the reaction were extended to the matrix of the magnet forming Al36Ti43Fe17Nd4 in the sample coated with Ti/Al, but forming Ni2AlFe0.1 in the Ni/Al coated sample. The presence of these intermetallics were confirmed by leaching the coated magnets in NaOH. We had observed that the annealed Ti/Al coated sample had a smooth surface, while that of the Ni/Al was porous with microcracks as a result of the volume contraction of the Ni/Al layer. It was also found that Nd in the Nd-rich grain boundaries of the magnet tended to react actively with the dual layers. The areas involved would be extended as the annealing temperature and time increased. This shows that the quality of the resultant intermetallic coating depends upon the microstructure of the NdFeB magnet. Furthermore, the adhesion between the coating and the magnet can be improved greatly by the appropriate heat treatment.
著者Ku NC, Qin CD, Ng DHL
會議名稱35th Annual IEEE International Magnetics Conference (INTERMAG 97)
會議開始日01.04.1997
會議完結日04.04.1997
會議地點NEW ORLEANS
期刊名稱IEEE Transactions on Magnetics
出版年份1997
月份9
日期1
卷號33
期次5
出版社IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
頁次3913 - 3915
國際標準期刊號0018-9464
電子國際標準期刊號1941-0069
語言英式英語
Web of Science 學科類別Engineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Physics; Physics, Applied; PHYSICS, APPLIED

上次更新時間 2021-03-03 於 01:28