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Thermal Stability of TiC0.81N0.48 and TiC0.61N0.44O0.15 Coatings |
ZHU Lihui1** ZHANG Yumeng 1 PENG Xiao1 Peter Leicht 2 LIU Yixiong 2 |
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2. Kennametal Inc., Latrobe, PA 15650, USA |
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Cite this article:
ZHU Lihui , **, ZHANG Yumeng , PENG Xiao , Peter Leicht , LIU Yixiong. Thermal Stability of TiC0.81N0.48 and TiC0.61N0.44O0.15 Coatings. Chinese Journal of Materials Research, 2013, 27(3): 312-316.
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Abstract TiC0.81N0.48 coating and TiC0.61N0.44O0.15 coating deposited by medium temperature chemical vapor deposition, were characterized by Vickers hardness tester, X-ray diffraction (XRD) and confocal Raman spectrometer, and the effect of microstructure transformation on the hardness was investigated. Results show that the hardness of TiC0.81N0.48 and TiC0.61N0.44O0.15 coatings declines after annealing at 700 ℃ in vacuum, and then tends to be stable. At the beginning of the annealing, some C atoms escape from the lattice of TiCN, resulting in the formation of sp3C. As the annealing time prolongs, sp3C transforms to sp2C gradually. Thereafter the clustering of sp2C increases, the disorder degree decreases, and TiCN decomposes into TiC and TiN. The decrease of hardness is related with the release of residual stress due to the defect annihilation. Besides, the microstructure transformation especially the formation of sp3C and sp2C decreases the hardness of coatings. Compared with TiC0.61N0.44O0.15, the microstructure transformation takes places earlier in TiC0.81N0.48 coating, which exhibits worse thermal stability.
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Received: 11 March 2013
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Fund: *Supported by Kennametal Inc.. Manuscript received March 11, 2013; in revised form April 18, 2013. |
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