Surface coating of hddr processed and mechanically alloyed powder based on re-tm

摘要

Chemical surface modification can be used as a method for corrosion protection of sensitive powders based on intermetallic alloys between rare earth and transition metals. Surface coating is used for preventing fine powders, based on Nd-Fe-B, or Sm_2Fe_(17-x)Ta_xN_(3- delta ) prepared by HDDR processign and mechanically alloying, from hydrolysis. Powders coated by chemisorbed organic substance, after exposing to a humid atmosphere, do not show any chemical or physical change.