Oxidation Resistance of ZrB₂-SiC-WSi₂ Coating Prepared by Vacuum Plasma Spraying

Abstract:

ZrB₂-SiC-WSi₂ (labeled as ZSW) coating and ZrB₂-SiC (labeled as ZS) coating were fabricated by vacuum plasma spray technique. The microstructure and composition of as-sprayed coating were detected through X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray energy dispersive spectrometry (EDS). Oxidation behaviors and microstructure evolution of these coatings were evaluated at 1500 °C in air and compared with ZrB₂-SiC coating. The results showed that the addition of WSi₂ improved the oxidation resistance of the ZrB₂-SiC coating. There was more liquid formed on the ZSW coating surface. Some bubbles were also observed on the coating surface, which might be resulted from gas formation. It can be concluded that the amount of WSi₂ had great influence on its function in ZrB₂-SiC system.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 522-527
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.522
• Online since: August 2018
• Authors: Chong Li, Ya Ran Niu*, T. Liu, Jun Zhao, Xue Bin Zheng, Chuan Xian Ding
• Keywords: Oxidation Resistance, Vacuum Plasma Spray, WSi₂, ZrB₂- SiC Coating

References

[1] W. G. Fahrenholtz, G. E. Hilmas, I. G. Talmy, et al. Refractory diborides of zirconium and hafnium, J. Am. Ceram. Soc. 90 (2007) 1347-1364.

DOI: 10.1111/j.1551-2916.2007.01583.x

[2] S. Q. Guo. Densification of ZrB2-based composites and their mechanical and physical properties: a review, J. Eur. Ceram. Soc. 29(2009) 995-1011.

[3] W. G. Fahrenholtz, G. E. Hilmas, Ultra-high temperature ceramics: Materials for extreme environments, Scr. Mater. 129 (2017) 94-99.

DOI: 10.1016/j.scriptamat.2016.10.018

[4] E. Eakins, D. D. Jayaseelan, W. E. Lee, Toward oxidation-resistant ZrB2-SiC ultra high temperature ceramics, Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. 42(2011) 878-887.

DOI: 10.1007/s11661-010-0540-8

[5] C. M. Carney, T. A. Parthasarathy, M. K. Cinibulk, Oxidation resistance of hafnium diboride ceramics with additions of silicon carbide and tungsten boride or tungsten carbide, J. Am. Ceram. Soc. 94(2011) 2600-2607.

DOI: 10.1111/j.1551-2916.2011.04462.x

[6] J. Zou, V. Rubio, J. Binner. Thermoablative resistance of ZrB2-SiC-WC ceramics at 2400 °C, Acta Mater. 133(2017) 293-302.

DOI: 10.1016/j.actamat.2017.05.033

[7] S. C. Zhang, G. E. Hilmas, W. G. Fahrenholtz, Improved oxidation resistance of zirconium diboride by tungsten carbide additions, J. Am. Ceram. Soc. 91 (2008) 3530-3535.

DOI: 10.1111/j.1551-2916.2008.02713.x

[8] S. C. Zhang, G. E. Hilmas, W. G. Fahrenholtz, Oxidation of zirconium diboride with tungsten carbide additions, J. Am. Ceram. Soc. 94 (2011) 1198-1205.

DOI: 10.1111/j.1551-2916.2010.04216.x

[9] S. N. Karlsdottir, J. W. Halloran, C. E. Henderson, Convection patterns in liquid oxide films on ZrB2–SiC composites oxidized at a high temperature, J. Am. Ceram. Soc. 90 (2007) 2863-2867.

DOI: 10.1111/j.1551-2916.2007.01784.x

[10] L. L. Y. Chang, M. G. Scroger, B. Phillips, Condensed phase relations in the systems ZrO2-WO2-WO3 and HfO2-WO2-WO3, J. Am. Ceram. Soc. 50(1967) 211-215.

DOI: 10.1111/j.1151-2916.1967.tb15084.x

[11] M. K. Dehdashti, W. G. Fahrenholtz, G. E. Hilmas, Effects of temperature and the incorporation of W on the oxidation of ZrB2 ceramics, Corrosion Sci. 80(2014) 221-228.

DOI: 10.1016/j.corsci.2013.11.030

[12] C. Carney, A. Paul, S. Venugopal, et al. Qualitative analysis of hafnium diboride based ultra high temperature ceramics under oxyacetylene torch testing at temperatures above 2100 oC, J. Eur. Ceram. Soc. 34(2014) 1045-1051.

DOI: 10.1016/j.jeurceramsoc.2013.11.018