TECHNICAL AND OPERATING FEATURES OF INTERACTION BETWEEN HYDROGENS ANDALLOYS AND MAGNETS ON THE BASIS OF RARE-EARTH-METALS

The effects of chemical compositions and protective coverings on hydro genous resistance on sintered RE Co magnets have been investigated. It was shown that both materials were destroyed due to hydrogen influenc e. There was a latent period, while magnetic properties and constructi ve integrity remained constant. II was shown that the additions of Dy, Tb into the RE-Fe-B-M alloy and Gd, Er into the RE-Co alloy reduced h ydrogenous resistance essentially. On the contrary, the additions of T i, Nb into the RE-Fe-B-M alloy increased hydrogenous resistance. It wa s shown that surface protection of magnets by three layers of Ni-Cu-Ni or by two layers of Ni-Cu allows to use magnets in hydrogenous surrou ndings. Copyright (C) 1997 International Association for Hydrogen Ener gy.