1. Relationship between Hydrogen Pressure and Temperature for Recombination Reactions in the HDDR Processing of Ce-Fe-B Alloys.
- Author
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Ryo Shimbo, Takashi Horikawa, Masao Yamazaki, Masashi Matsuura, Ryosuke Kainuma, and Satoshi Sugimoto
- Subjects
MAGNETIC properties ,HYDROGEN ,ALLOYS ,RESEARCH personnel ,MAGNETS ,LOW temperatures ,MAGNETIC particles ,RARE earth metals - Abstract
In recent years, to reduce manufacturing costs and alleviate the rare-earth supply/demand imbalance in the N-Fe-B magnet market, researchers have actively pursued the development of (Nd,Ce)-Fe-B magnets, in which Nd is replaced by Ce. In the present study, we focused on magnetic powders treated by the hydrogenation-disproportionation-desorption-recombination (HDDR) process and explored the relationship between the hydrogen pressure and temperature (P
H2 -T curves) in the Ce-Fe-B system, which is essential for the development of (Nd,Ce)-Fe-B magnets. It was confirmed that the disproportionation and recombination reactions of both Ce2 Fe14 B and CeFe2 take place in the Ce-Fe-B system. Furthermore, compared with Nd2 Fe14 B, the PH2 -T curve of Ce2 Fe14 B was found to be shifted to higher pressure and lower temperature, suggesting a corresponding shift in the HDDR conditions under which good magnetic properties can be obtained. [ABSTRACT FROM AUTHOR]- Published
- 2023
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