Abstract
The hydrogenation-decomposition-desorption-recombination (HDDR) process utilizes the hydrogen-induced phase transformations in intermetallic compounds, and this process can be used to produce unique microstructures such as very fine crystalline grain materials as was shown for the Nd 2Fe 14B magnet system. It has also been reported that finer particles or finer crystalline grain materials are needed to realize larger coercive forces in the Sm 2Fe 17N x magnet system. Some studies are now being carried out on the Sm 2Fe 17N x magnet productions by the HDDR process. In this review, the present status of the HDDR process is described regarding the production of Nd-Fe-B magnet powders and its recent applications to Sm 2Fe 12N x magnets.
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