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자료유형
학술저널
저자정보
Md. Abdul Matin (Pukyong National University) Hae-Woong Kwon (Pukyong National University) Jung-Goo Lee (Korea Institute of Materials Science) Ji-Hun Yu (Korea Institute of Materials Science)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.19 No.2
발행연도
2014.6
수록면
106 - 110 (5page)

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Nd<SUB>12.5</SUB>Fe<SUB>80.6</SUB>B<SUB>6.4</SUB>Ga<SUB>0.3</SUB>Nb<SUB>0.2</SUB> HDDR-treated powder was compacted by hot-pressing using different configurations of dies and heating rates. The die configurations were especially different in terms of the evacuation system that was used in heating for hot-pressing. The coercivity in the compacts was influenced by the evacuation system of the die and heating rate. In spite of the identical hot-pressing temperature and heating rate, coercivity was radically reduced above 600 °C in the compacts prepared in the closed-type die compared to that in the compacts prepared in the open-type die. The coercivity in the compacts prepared in the closed-type die decreased with increasing heating rate and the value further increased when extreme high heating rate was employed. Nd<SUB>12.5</SUB>Fe<SUB>80.6</SUB>B<SUB>6.4</SUB>Ga<SUB>0.3</SUB>Nb<SUB>0.2</SUB> HDDR-treated powder contained a significant amount of residual hydrogen (approx. 1500 ppm) in the form of Nd<SUB>2</SUB>Fe<SUB>14</SUB>BHx hydride. The dramatic coercivity decrease in the compact prepared in the closed die is attributed to the disproportionation of Nd<SUB>2</SUB>Fe<SUB>14</SUB>BHx hydride. High coercivity is mainly due to the effective desorption of hydrogen or the suppression of hydrogen-related disproportionation upon hot-pressing.

목차

1. Introduction
2. Experimental Work
3. Results and Discuss
4. Conclusion
References

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UCI(KEPA) : I410-ECN-0101-2015-420-001709581