Hydrogen grinding method, a method of manufacturing a rare earth permanent magnet

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PROBLEM TO BE SOLVED : To provide techniques for shortening the length of time required for a dehydrogenation process, improving atomization in an atomizing step, and improving the magnetic properties of a magnet as a final product. SOLUTION : As to a dehydrogenation method, a metal is disposed in an inert gas atmosphere and temperature inside a furnace is raised. After the inside of the furnace is formed into vacuum state, temperature is further raised. In an example 1 where the temperature inside the furnace is raised while making the atmosphere inside the furnace inert at first, dehydrogenation treatment is completed in a shorter time than in the case of a comparative example 1 wherein temperature raising is started after the inside of the furnace is formed into vacuum state; further, the precipitation of α-Fe is more suppressed than in the case of a comparative example 2 where dehydrogenation treatment is completed while keeping the inert gas atmosphere as such. COPYRIGHT : (C)2004, JPO&NCIPI