The protective coatings of NdFeB magnets by Al and Al(Fe)
Publication in refereed journal


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摘要NdFeB permanent magnets are coated by two different methods, dip coating and evaporation coating, with Al. It is found that an intermetallic reaction has occurred and formed a dominant phase of FeAl2.5Bx at the interface between the Al coating and the magnet material. Such reaction enhances strong bonding between the coating and the magnet. When Al(Fe) is used for the coating, no detectable intermetallic phase is observed, and therefore the amount of magnet material is conserved. We have studied the effect of the intermetallic phase on corrosion protection of the magnet. It is found that this phase is less resistive towards HNO3 solution than pure Al; but it is more resistive towards NaOH and NaCl. The investigation of the changes of microstructures of the coatings under different tempering conditions have also been carried out. The results show that the beat treatment at 500 degrees C for 10 min for a similar to 2 mu m thick Al coating by evaporation can produce an optimal layer of intermetallics. If the temperature is too low, the coating will not adhere to the magnet or if too high, it will fully react with the magnet and produce a rough coating surface. (C) 1996 American Institute of Physics.
著者Qin CD, Li ASK, Ng DHL
會議名稱40th Annual Conference on Magnetism and Magnetic Materials
會議開始日06.11.1995
會議完結日09.11.1995
會議地點PHILADELPHIA
期刊名稱Journal of Applied Physics
出版年份1996
月份4
日期15
卷號79
期次8
出版社AMER INST PHYSICS
頁次4854 - 4856
國際標準期刊號0021-8979
電子國際標準期刊號1089-7550
語言英式英語
Web of Science 學科類別Physics; Physics, Applied; PHYSICS, APPLIED

上次更新時間 2021-17-02 於 01:06