용융염을 이용한 다이아몬드 표면의 크롬카바이드 코팅

정영우; 김화정; 안용식; 최희락; Young-Woo Jeong; Hwa-Jung Kim; Yong-Sik Ahn; Hee-Lack Choi

Korean Journal of Materials Research, Vol.28, No.7, 423-427, July, 2018

DOI10.3740/MRSK.2018.28.7.423 Export Citation

용융염을 이용한 다이아몬드 표면의 크롬카바이드 코팅

Chromium Carbide Coating on Diamond Particle Using Molten Salts

정영우, 김화정¹, 안용식², 최희락^{2, †}

부경대학교 과학기술융합전문대학원 LED융합공학전공
¹부경대학교 LED공학협동과정
²부경대학교 재료공학과

Young-Woo Jeong, Hwa-Jung Kim¹, Yong-Sik Ahn², and Hee-Lack Choi^{2, †}

Department of LED Convergence Engineering, Specialized Graduate School Science & Technology Convergence, Pukyong National University, Busan 48547, Republic of Korea
¹Interdisciplinary program of LED and Solid State Lighting Engineering, Pukyoung National University, Busan 48547, Republic of Korea
²Department. of Materials Science and Engineering, Pukyong National University, Busan 48547, Republic of Korea

E-mail:

For diamond/metal composites it is better to use diamond particles coated with metal carbide because of improved wettability between the diamond particles and the matrix. In this study, the coating of diamond particles with a chromium carbide layer is investigated. On heating diamond and chromium powders at 800~900 °C in molten salts of LiCl, KCl, CaCl2, the diamond particles are coated with Cr7C3. The surfaces of the diamond powders are analyzed using X-ray diffraction and scanning electron microscopy. The average thickness of the Cr7C3 coating layers is calculated from the result of the particle size analysis. By using the molten salt method, the Cr7C3 coating layer is uniformly formed on the diamond particles at a relatively low temperature at which the graphitization of the diamond particles is avoided. Treatment temperatures are lower than those in the previously proposed methods. The coated layer is thickened with an increase in heating temperature up to 900 °C. The coating reaction of the diamond particles with chromium carbide is much more rapid in LiCl-KCl-CaCl2 molten salts than with the molten salts of KCl-CaCl2.

Keywords:diamond;coating;molten salts method;chromium carbide

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[1] Okada T, Fukuoka K, Arata Y, Yonezawa S, Kiyokawa H, Takashima M, Diamond Relat. Mater., 52, 11 (2015)

[2] Breval E, Cheng JP, Agrawal DK, J. Am. Ceram. Soc., 83(8), 2106 (2000)

[3] Ma SD, Zhao NQ, Shi CS, Liu EZ, He CNA, He F, Ma LY, Appl. Surf. Sci., 402, 372 (2017)

[4] Rape A, Thesis D, p.57, The Pennsylvania State University, Philadelphia (2015).

[5] Chu K, Liu Z, Jia C, Chen H, Liang X, Gao W, Tian W, Guo H, J. Alloy. Compd., 490, 453 (2010)

[6] Xue C, Yu JK, Zhu XM, Mater. Design, 32, 4225 (2011)

[7] Ge JB, Wang S, Zhang F, Zhang L, Jiao HD, Zhu HM, Jiao SQ, Appl. Surf. Sci., 347, 401 (2015)

[8] Donald M. Mattox, Handbook of Physical Vapor Deposition (PVD) Processing, 2th ed., p.237, Elsevier, (2010).

[9] Spear KE, Dismukes JP, Synthetic Diamond:Emerging CVD Science and Technology, 1st ed., p.33, The Electrochemical Society (1995).

[10] Pierson HO, Handbook of chemical vapor deposition:principles, technology and applications, 2nd ed., p.25, William Andrew (1999).

[11] Baek YJ, Ceramist, 8, 311 (1993)

[12] George J. Janz, Molten Salts Handbook, first ed., Elsevier, p.89, (1969).

[13] Costas Sikalidis, Advances in Ceramics - Synthesis and Characterization, Processing and Specific Applications, INTECH, p.75, (2011).

[14] Sun N, Zhang Y, Jiang F, Lang S, Xia M, Fusion Eng. Des., 89, 2529 (2014)

[15] Lee JH, Thesis D, p.12-14, InHa University, Seoul (2009).

[16] Kim KS, Thesis D, p.23-26, Pusan national university, Busan (2003).

[17] Lee YS, Oh BJ, Rhee BS, Korean Soc. Comp. Mater., 10, 46 (1997)

[18] Hong WS, Kim HS, Park NC, Kim KB, J. KWJS,, 25, 82 (2007)