Recycle of rare earth sintered magnet powder scraps as electromagnetic wave absorbers in gigahertz range

2008 ◽  
Vol 451 (1-2) ◽  
pp. 507-509 ◽  
Author(s):  
Masahiro Itoh ◽  
Keizo Nishiyama ◽  
Fumiyoshi Shogano ◽  
Tadatoshi Murota ◽  
Kazuhiko Yamamoto ◽  
...  
Keyword(s):  
Rare Earth ◽  
Electromagnetic Wave ◽  
Sintered Magnet

Misch-Metal and/or Aluminum Substitutions in ND-FE-B Permanent Magnets

1987 ◽  
Vol 96 ◽  
Author(s):  
B. M. Ma ◽  
C. J. Willzian
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Alloy System ◽  
Magnetic Characteristics ◽  
Al Doping ◽  
Sintered Magnet ◽  
Al Content ◽  
Misch Metal ◽  
Heavy Rare Earth Elements ◽  
Energy Products

ABSTRACTThe effects of misch-metal–and/or Al substitutions in the Nd-Fe-B alloy system have been investigated. Selected compositions were processed into magnets using the conventional powder metallurgy technique. As expected, misch-metal substitutions act to degrade the intrinsic magnetic characteristics and thus degrade the properties of the sintered magnet. It was observed that at a level of 25% of the total rare earth being comprised of misch-metal, energy products of the order of 25 MGOe were still able to be achieved. Processing of such material is difficult because higher sintering temperatures are required to fully densify the magnet, and the grain growth that occurs at these temperatures dramatically reduces the coercivity. The effects of misch-metal substitutions are quantified in this discussion.Al was found to be beneficial for improving the coercivity in both the Nd-Fe-B and misch-metal-Fe-B alloy systems. Unfortunately Al substitutions reduce both the remanence and the Curie temperature. If the Al content is kept to 1 wt.% or less, magnets exhibiting reasonable properties can be made. Al doping as opposed to doping with expensive heavy rare earth elements such as Th or Dy is a less costly method of improving Hei, in the Nd-Fe-B magnets.

Waste Nd-Fe-B Sintered Magnet Recycling by Doping With Rare Earth Rich Alloys

2014 ◽  
Vol 50 (12) ◽  
pp. 1-3 ◽  
Author(s):  
Chao Li ◽  
Wei Qiang Liu ◽  
Ming Yue ◽  
Yan Qin Liu ◽  
Dong Tao Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Sintered Magnet
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