Application of a Novel CVD TiN Coating on a Biomedical Co–Cr Alloy: An Evaluation of Coating Layer and Substrate Characteristics
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Department of Medical & Biological Engineering, Graduate School, Kyungpook National University, Daegu 41940, Korea
2
Center for Research Facilities, Yeungnam University, Gyeongsan 38541, Korea
3
Department of Dental Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan 46252, Korea
4
Department of Dental Biomaterials, School of Dentistry and Institute for Biomaterials Research & Development, Kyungpook National University, Daegu 41940, Korea
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(5), 1145; https://doi.org/10.3390/ma13051145
Received: 9 February 2020
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Revised: 29 February 2020
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Accepted: 2 March 2020
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Published: 5 March 2020
Titanium nitride (TiN) was deposited on the surface of a cobalt–chromium (Co–Cr) alloy by a hot-wall type chemical vapor deposition (CVD) reactor at 850 °C, and the coating characteristics were compared with those of a physical vapor deposition (PVD) TiN coating deposited on the same alloy at 450 °C. Neither coating showed any reactions at the interface. The face-centered cubic (fcc) structure of the alloy was changed into a hexagonal close-packed (hcp) phase, and recrystallization occurred over at 10 μm of depth from the surface after CVD coating. Characteristic precipitates were also generated incrementally depending on the depth, unlike the precipitates in the matrix of the as-cast alloy. On the other hand, the microstructure and phase of the PVD-coated alloy did not change. Depth-dependent nano-hardness measurements showed a greater increase in hardness in the recrystallization zone of the CVD-coated alloy than in the bulk center of the alloy. The CVD coating showed superior adhesion to the PVD coating in the progressive scratch test. The as-cast, PVD-coated, and CVD-coated alloys all showed negative cytotoxicity. Within the limitations of this study, CVD TiN coating to biomedical Co–Cr alloy may be considered a promising alternative to PVD technique.
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Keywords:
cobalt–chromium alloy; titanium nitride; physical vapor deposition; chemical vapor deposition; microstructure
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MDPI and ACS Style
Song, S.H.; Min, B.K.; Hong, M.-H.; Kwon, T.-Y. Application of a Novel CVD TiN Coating on a Biomedical Co–Cr Alloy: An Evaluation of Coating Layer and Substrate Characteristics. Materials 2020, 13, 1145. https://doi.org/10.3390/ma13051145
AMA Style
Song SH, Min BK, Hong M-H, Kwon T-Y. Application of a Novel CVD TiN Coating on a Biomedical Co–Cr Alloy: An Evaluation of Coating Layer and Substrate Characteristics. Materials. 2020; 13(5):1145. https://doi.org/10.3390/ma13051145
Chicago/Turabian StyleSong, Si H., Bong K. Min, Min-Ho Hong, and Tae-Yub Kwon. 2020. "Application of a Novel CVD TiN Coating on a Biomedical Co–Cr Alloy: An Evaluation of Coating Layer and Substrate Characteristics" Materials 13, no. 5: 1145. https://doi.org/10.3390/ma13051145
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