HDDR 반응시 수소화 반응이 Nd-Fe-B계 분말의 미세조직과 자기적 특성에 미치는 영향
Effect of Magnetic properties and Microstructure of Hydrogenation stage in HDDR process
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초록
The HDDR(hydrogenation-disproportionation-desorption-recombination) process can be used as an effective way of converting no coercivity Nd-Fe-B material, with a coarse Nd2Fe14B grain structure to a highly coercive one with a fine grain. Careful control of the HDDR process can lead to an anisotropic Nd2Fe14B without any post aligning process. In this study, the effect of hydrogen gas input at various temperature in range of 200~500℃ of hydrogenation stage (named Modified-solid HDDR, MS-HDDR) on the magnetic properties has been investigated. The powder from the modified-solid HDDR process exhibits Br of 11.7 kG and iHc of 10.7kOe, which are superior to those of the powder prepared using the normal HDDR process.
Abstract
The HDDR(hydrogenation-disproportionation-desorption-recombination) process can be used as an effective way of converting no coercivity Nd-Fe-B material, with a coarse Nd2Fe14B grain structure to a highly coercive one with a fine grain. Careful control of the HDDR process can lead to an anisotropic Nd2Fe14B without any post aligning process. In this study, the effect of hydrogen gas input at various temperature in range of 200~500℃ of hydrogenation stage (named Modified-solid HDDR, MS-HDDR) on the magnetic properties has been investigated. The powder from the modified-solid HDDR process exhibits Br of 11.7 kG and iHc of 10.7kOe, which are superior to those of the powder prepared using the normal HDDR process.
참고문헌 (14)
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