Neodymium was replaced by mixed rare earth in high-temperature Magnets
The Amos laboratory of US Department of Energy and Iowa State University jointly developed a high-performance NdFeB permanent magnetic alloy, wherein neodymium was replaced by mixed rare earth in order to increase the Curie temperature of the alloy. This magnet can still maintain good magnetic properties at high temperature of 200 ℃.
Currently, the most efficient permanent magnet material is in Nd2Fe14B crystalline structure. However,magnetic properties of the alloy will be reduced by half at a temperature of 100 ~ 125 ℃. Therefore, the researchers designed an alloy in which pure neodymium was replaced by mixed rare earth. The material was composed with neodymium, yttrium and dysprosium in a crystalline structure of 2-14-1. Magnetic properties of the alloy will not be deteriorated with the temperature rise as yttrium and dysprosium play a role.The new magnet is made by the argon aerosol technology, which the resulting pellets powder is pressed by injection molding and formed. The process is suitable for mass production with low cost.
Exploring Demagnetization problem of NdFeB magnet