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High Temperature Stability of Nitride Ceramic Materials in LiF-NdF3-Nd2O3 Molten Salts System

LiF-NdF3-Nd2O3 용융염에서 질화물계 세라믹재료의 고온안정성

Kwon, Sukcheol;Lee, Young-Jun;Ryu, Hong-Youl;Lee, Go Gi;Jo, Sung Koo;Lee, Jong-Hyeon
권숙철;이영준;류홍열;이고기;조성구;이종현

  • Received : 2015.09.22
  • Accepted : 2015.10.27
  • Published : 2015.12.27

Abstract

Nd-Fe-B permanent magnets have been used in a wide variety of applications because of their high magnetic flux density. So, demand for neodymium has been increasing in worldwide. In this study, an electrowinning process was performed in $LiF-NdF_3-Nd_2O_3$ high temperature molten salts. However, a corrosion resistant material for use in the molten salt must be found for stable operation because of the harsh corrosion environment of the electrowinning process. Therefore, for this paper, boron nitride(BN), aluminum nitride(AlN), and silicon nitride($Si_3N_4$) were selected as protective and structural materials in the high temperature electrolyte. To investigate the characteristics of BN, AlN, and $Si_3N_4$, in molten salts, materials were immersed in the molten salts for 24, 72, 120, and 192 hours. Also, surface condition and stability were investigated by SEM and EDS and corrosion products were calculated by HSC chemistry. As a result, among BN, AlN, and $Si_3N_4$, AlN was found to show the best protective material properties.

Keywords

nitride ceramic materials;neodymium;electrowinning;protective material

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Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning(KETEP)