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Korean Journal of Metals and Materials > Volume 54(8); 2016 > Article
Korean Journal of Metals and Materials 2016;54(8): 559-565. doi: https://doi.org/10.3365/KJMM.2016.54.8.559
용사 코팅한 ZrO2/W/Mo-Graphite 코팅층의 2100 ℃ 열처리 후 미세조직 변화에 관한 연구
안규백1,2, 최경환1, 김상섭2, 조규섭1,*
1한국생산기술연구원 뿌리산업기술연구소
2인하대학교 공과대학 신소재공학부
Microstructure Changes of ZrO2/W/Mo Coating Layers on Graphite after Heat Treatment at 2100 ℃
Gyu Baek Ahn1,2, Kyeong Hwan Choe1, Sang Sub Kim2, Gue Serb Cho1,*
1Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea
2Material Science and Engineering, Inha University, Incheon 22212, Republic of Korea
Correspondence  Gue Serb Cho ,Tel: +82-32-8500-445, Email: gscho@kitech.re.kr
Received: 16 September 2015;  Accepted: 11 March 2016.  Published online: 5 August 2016.
ABSTRACT
A tungsten coating was deposited onto a graphite substrate using the atmospheric plasma spraying (APS) technique. In order to increase the adhesion strength between the metallic tungsten(W) and graphite, a molybdenum (Mo) interlayer was pre-deposited onto the graphite surface by utilizing the APS technique. Also, after deposition of a APS-W coating, a zirconia (ZrO2) was deposited onto the W coating layer. For the APS process, argon and helium were used as the plasma-forming gases, and argon was used as the shield gas to protect the plasma from oxidation. After the APS coating process, heat exposure treatment was performed at 2100 ℃ for 360 h within a sapphire single crystal-growing furnace in order to evaluate the thermal stability of the coatings. After heat treatment, the ZrO2/W/Mo coating layers were bound with the graphite without any peeling off. The microvickers hardness of the APS-W coating layer was increased after heat treatment due to the formation of carbides. Also, carbide phases such as Mo2C, WC, ZrC and Mo3C2 were identified by XRD diffraction and EDS analysis, by analyzing the depths below the coating surface. It was considered that the Mo interlayer served as a good buffer layer between the APS-W coating and the graphite after the heat exposure treatment because the lattice structure of the molybdenum carbide was similar to that of the graphite.
Keywords: metals, microstructure, scanning electron microscopy, Mo interlayer, plasma deposition spray
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