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New Compound Opens Way To EV Magnet Without Rare Earths
TOKYO (Nikkei)--A team of researchers, mainly from Toda Kogyo Corp. and Tohoku University, said Thursday that it succeeded in making a magnetic material without rare-earth metals.
The material is an ultrafine powder -- made from iron and nitrogen -- measuring tens to hundreds of nanometers in diameter. It can be used in electric-vehicle motor magnets, the researchers say. The goal is to commercialize the compound by 2023 with help from Toyota Motor Corp. and Honda R&D Co. The team was able to make several tens of grams of the compound while ensuring even quality. But for commercial application, the material must be molded into a magnet by using heat and pressure. A magnet made of this compound will be "60% more powerful than existing magnets," says professor Migaku Takahashi of Tohoku University. This opens a new frontier in the development of smaller magnets, making it possible to reduce the size of EV motors by 40% without compromising power.
Existing magnets for EV motors use neodymium, a rare-earth metal mostly produced in China, as well as iron and boron. As prices of neodymium rise, the industry has been seeking an alternative.
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