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Korean Journal of Metals and Materials > Volume 56(5); 2018 > Article
Korean Journal of Metals and Materials 2018;56(5): 360-365. doi: https://doi.org/10.3365/KJMM.2018.56.5.360
Kinetic spray 공정으로 제조된 탄탈럼 코팅층의 미세조직 및 물성에 미치는 송급 가스의 영향
김가령1, 김영균2, 김형준3, 이기안2
1대신강업㈜
2인하대학교 신소재공학과
3포항산업과학연구원
Effect of Carrier Gas on Microstructure and Macroscopic Properties of Tantalum Coating Layer Manufactured by Kinetic Spray Process
Ga-Ryung Kim1, Young-Kyun Kim2, Hyung-Jun Kim3, Kee-Ahn Lee2
1Daeshin Co., Ulsan 44252, Republic of Korea
2Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea
3Research Institute of Industrial Science & Technology, Pohang 37673, Republic of Korea
Correspondence  Kee-Ahn Lee ,Tel: +82-32-860-7532, Email: keeahn@inha.ac.kr
Received: 10 January 2018;  Accepted: 8 March 2018.  Published online: 8 May 2018.
ABSTRACT
This study attempted to utilizing the kinetic spray process to manufacture tantalum coating layer and investigated the effect of carrier gas on the microstructure and macroscopic properties of the coating layer. The initial powder feed stock was a massive powder with an average particle size of 24.35 μm and 99.99% purity. Tantalum coating layers were obtained utilizing kinetic spraying with two carrier gases, N2 and He. The manufactured tantalum coating layers featured dense structures without impurities at α-Ta phase regardless of the carrier gas used. The hardness and porosity of the layers were found to be 285 Hv and 0.04% at the He coating layer, and 270 Hv and 0.28% at the N2 coating layer. The measurement found that the coating layer produced with He gas had higher hardness and density than those of the coating layer produced with N2 gas. Through observation of the manufactured layer microstructure, the coating layer using He gas showed a particle laminating maneuver caused by larger plastic deformation. It is possible that, compared to the case of using N2 gas, higher particle speed can be applied when using He carrier gas to deposit tantalum powder. Based on observations above, this study also discussed possible methods to improve the physical properties of kinetic sprayed tantalum coating layer.
Keywords: kinetic spraying, tantalum, carrier gas, nitrogen, helium, density, bond strength
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