PERMANENT MAGNET

摘要

A permanent magnet comprises at least one of the rare-earth metals including yttrium, as well as boron, nitrogen, oxygen and iron. The magnet further comprises hydrogen. The ratio of the components in per cent by weight is the following: rare-earth metal including yttrium 8.0-42.0; boron 0.7-10.0; nitrogen 0.003-5.0; oxygen 0.01-2.0; hydrogen 0.001-1.0; iron the balance. The magnet further comprises at least one of the metals of groups III, IV, and alpha -elements at a quantity of no more than 20.0 % by weight of the content of iron and may contain lithium at 0.2-20.0 % by weight of the content of boron.