Study on in-Situ Preparation and Growth Mechanism of TiC_xN_1-x Whiskers

Abstract:

TiC_xN_1-x whiskers were prepared using TiO₂ and carbon mixed powder as the starting powder at the atmosphere of nitrogen by the carbothermal reduction process. NaCl and NiCl₂ were added into the starting powder as the cosolvent and growth adds of impurities, respectively. An effect of the content of TiO₂ and carbon in the starting powder on the TiC_xN_1-x whiskers was investigated. It is found from SEM and XRD observations that three types of TiC_x N_1-x whiskers are obtained when the different mol ratios of C and Ti are applied. The growth of whiskers is not only urged by the droplet on the top of whiskers, but also initiated by the helical dislocations. The growth of TiC_xN_1-x whiskers is controlled by the vapor-liquid-solid mechanism as well as vapor-solid mechanism.

• Periodical: Advanced Materials Research (Volumes 197-198)
• Pages: 617-622
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.197-198.617
• Online since: February 2011
• Authors: Xue Wen Chong, Chuan Zhen Huang, Liang Xu, Bin Zou, Han Lian Liu, Hong Tao Zhu
• Keywords: Growth, In-Situ Preparation, Mechanism, TiC_xN_1-x Whisker

References

[1] A.H. Zhang, J.H. Yuan, X. Zhang, et al: Journal of Refractory Metals&Hard Materials Vol. 24 (2006), p.236.

[2] K. Haysih, K. Sakauer, U.S. Patent, 5, 360, 772. (1994).

[3] B.Q. Liu, C.Z. Huang, M.L. Gu, et al: Materials Science and Engineering A Vol. 460-461 (2007), p.146.

[4] B.Q. Liu, C.Z. Huang, X.Y. Lu, et al: Ceramic International Vol. 33 (2007), p.1475.

[5] N. Ahken, M. Johnsson, M. Nygern: Journal of Materials Science Letters Vol. 18 (1999), p.1071.

[6] R.S. Wagner, W.C. Ellis: Applied Physics letters Vol. 4 (1964), p.89.

[7] F.C. Frank: Discussion Faraday Society. Vol. 25 (1958), P. 19.