LiF-NdF3-Nd2O3 용융염에서 질화물계 세라믹재료의 고온안정성

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

Korean Journal of Materials Research, Vol.25, No.12, 694-702, December, 2015

DOI10.3740/MRSK.2015.25.12.694 Export Citation

LiF-NdF3-Nd2O3 용융염에서 질화물계 세라믹재료의 고온안정성

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

권숙철¹, 이영준¹, 류홍열², 이고기³, 조성구³, 이종현^{1, 4, †}

¹충남대학교 에너지과학기술대학원
²한국기초과학지원연구원
³포항산업과학기술연구원
⁴충남대학교 신소재공학과

Sukcheol Kwon¹, Young-Jun Lee¹, Hong-Youl Ryu², Go Gi Lee³, Sung Koo Jo³, and Jong-Hyeon Lee^{1, 4, †}

¹Graduate School of Energy Science and Technology, Chungnam National University, Daejeon 34134, Korea
²Division of Earth and Environmental Science, Korea Basic Science Institute, Cheongju 28119, Korea
³Department of Advanced Metallic Materials Research, Research Institute of Industrial Science and Technology, Pohang 37673, Korea
⁴Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Korea

E-mail:

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-NdF3-Nd2O3 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(Si3N4) were selected as protective and structural materials in the high temperature electrolyte. To investigate the characteristics of BN, AlN, and Si3N4, 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 Si3N4, AlN was found to show the best protective material properties.

Keywords:nitride ceramic materials;neodymium;electrowinning;protective material

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[2] Stefanidaki E, Hasiotis C, Kontoyannis C, Electrochim. Acta, 46(17), 2665 (2001)

[3] Ryu HY, Lee JH, Kim WG, Nersisyan HH, Lee GG, Jo SK, Lee HH, Hwang IS, Rare Met., 34, 111 (2015)

[4] Cho SH, Hong SS, Kang DS, Jeong MS, Park BH, Hur JM, Lee HS, J. Korean Radioact. Waste Soc., 8, 33 (2010)

[5] Uusitalo MA, Vuoristo PMJ, Mantyla TA, Corrosion Sci., 46, 1311 (2004)

[6] Rapp RA, Corrosion Sci., 44, 209 (2002)

[7] Gonzalez-Rodriguez JG, Haro S, Martinez-Villafane A, Salinas-Bravo VM, Porcayo-Calderon J, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 435-436, 258 (2006)

[8] Spiegel M, Biedenkopf P, Grabke HJ, Corrosion Sci., 39, 1193 (1997)

[9] Zhu B, Lindbergh G, Electrochim. Acta, 46(17), 2593 (2001)

[10] Mohanty BP, Shores DA, Corrosion Sci., 46, 2893 (2004)

[11] Ruh A, Spiegel M, Corrosion Sci., 48, 679 (2006)

[12] Indacochea JE, Smith JL, Litko KR, Karell EJ, Raraz AG, Oxid. Met., 55, 1 (2001)

[13] Eichler J, Lesniak C, J. Eur. Ceram. Soc., 28, 1105 (2008)

[14] Pierson HO, Handbook of refractory carbides and nitrides ; properties, characteristics, processing, and applications, Noyes publications, pp. 238-241 (1996).

[15] So WS, Baik KH, Korean J. Mater. Res., 21(2), 106 (2011)

[16] Roine A, HSC Chemistry 6.1, Outotkumpu Research Oy, Pori, Finland (2006).

[17] Cho SH, Lim JH, Chung JH, Hur JM, Seo CS, Park SW, J. Korean Ind. Eng. Chem., 15(8), 913 (2004)

[18] Dean JA, Lange's handbook of chemistry, p. 329-341, McGRAW-HILL, INC., New York, (1999).

[19] Cherginets VL, Baumer VN, Galkin SS, Glushkova LV, Rebrova TP, Shtitelman ZV, Inorg. Chem., 45(18), 7367 (2006)

[20] Li X, Zhang L, Yin X, Ceram. Int., 39, 3035 (2013)

[21] Zaikov YP, Redkin AA, Apisarov AA, Korzun IV, Kulik NP, Isakov AV, Kataev AA, Chemezov OV, J. Chem. Eng. Data, 58(4), 932 (2013)