以稀土過渡金屬合金粉對燒結NdFeB磁體晶界擴散及磁性強化效應之研究

陳傳欣

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以稀土過渡金屬合金粉對燒結NdFeB磁體晶界擴散及磁性強化效應之研究

Magnetic properties enhancement of sintered NdFeB magnets by grain boundary diffusion with alloy powders of rare earth element and transition metal

陳傳欣 , Masters　　Advisor：張文成　　

繁體中文

稀土合金粉；晶界擴散；燒結釹鐵硼磁石； rare earth alloy powder ； grain boundary diffusion ； sintered NdFeB magnet

Abstract │ Reference (51) │ Altmetrics

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This study investigated the effect of various low melting point rare earth alloy powders on the grain boundary diffusion efficiency and magnetic properties for 5-mm thickness sintered NdFeB magnet. The first part discusses the effect of Cu, Co, Al-containing heavy rare earth alloy powder on the grain boundary diffusion efficiency. Under the same heat treatment conditions, the intrinsic coercive force (iHc) of the magnet was enhanced with the decrease of melting point of the alloy powders due to the increased flow ability during diffusion. The effectiveness of TbCu alloy powders is better than TbAl or TbCo alloy powders, the optimal ∆iHc of 10.8 kOe could be obtained for the case of using Tb0.75Cu0.25 powders. In contrast, for the same light rare earth M (Pr or Nd), the effect of MCu powders is better than MCo powders. The optimal ∆iHc of 3.5 kOe was obtained for the case of using Pr0.7Cu0.3 powders. The second part compares the antioxidation capability of DyCu, DyCo, TbCu and TbCo powders. It was found that average particle size of about 30 μm alloy powders were capable to sustain the atmosphere for five days without degrading the diffusion efficiency and the intrinsic coercivity. Among them, Co-containing rare earth powders are superior to those of Cu- containing rare earth powders. The third part investigates the magnetic properties of GBD-NdFeB magnets at high temperatures. Results show that using TbCu alloy powder as a diffusion source on M-grade (iHc=15-17 kOe) sintered NdFeB magnet can level up its room temperature iHc to UH-grade (iHc=24-26 kOe), and it has great magnetic properties at high temperatures.

Reference ( 51 ) 〈TOP〉

5. Nesbitt, E.A., J.H. Wernick, and E. Corenzwit, Magnetic Moments of Alloys and Compounds of Iron and Cobalt with Rare Earth Metal Additions. Journal of Applied Physics, 1959. 30(3): p. 365-367.
連結：
6. Hubbard, W.M., E. Adams, and J.V. Gilfrich, Magnetic Moments of Alloys of Gadolinium with Some of the Transition Elements. Journal of Applied Physics, 1960. 31(5): p. S368-S369.
連結：
7. Strnat, K., et al., Ferrimagnetism of the Rare‐Earth‐Cobalt Intermetallic Compounds R2Co17. Journal of Applied Physics, 1966. 37(3): p. 1252-1253.
連結：
9. Velge, W.A.J.J. and K.H.J. Buschow, Magnetic and Crystallographic Properties of Some Rare Earth Cobalt Compounds with CaZn5 Structure. Journal of Applied Physics, 1968. 39(3): p. 1717-1720.
連結：
11. Das, D.K., IEEE, 1969. 5: p. 214.
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