Abstract
Carbon fibre reinforced carbon (CFC) materials show a high potential for usage in furnaces as sample carriers for example, which is due to their excellent thermal stability compared to steel carriers. Only their tendency to react with different metals at high temperatures by Cdiffusion is a disadvantage, which can be solved by application of diffusion barriers. In order to enable the utilization of CFC-carriers for e.g. brazing furnaces, within the frame of this study thermally sprayed diffusion barrier coatings were developed. Coatings of mullite and ZrO2-7% Y2O3 (YSZ) were prepared by air plasma spraying (APS). The coatings were investigated in terms of their microstructure and thermal shock behaviour. In order to prove the suitability of the coatings for the application in brazing furnaces, the wettability of the coating surfaces by a Ni-based brazing alloy was investigated. The results showed that both mullite and YSZ could be deposited on CFC substrates with a bond coat of W or SiC. Both coatings exhibited good thermal shock behaviour and an excellent non-wetting behaviour against the used Ni-based braze alloy.
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References
Klein J. Carbon-carbon composites. Advanced Materials & Processes, 1986, 130(5): 64–68
Buckley J D. Carbon-carbon an overview. American Ceramic Bulletin, 1988, 67(2): 364–368
Sheehan J E. Oxidation protection for carbon fiber composites. Carbon, 1989, 27(5): 709–715
Dhami T L, Bahl O P, Awasthy B R. Oxidation-resistant carboncarbon composites up to 1700°C. Carbon, 1 1995, 33(4): 479–490
Kobayashi K, Maeda K, Sano H, Uchiyama Y. Formation and oxidation resistance of the coating formed on carbon materials composed of B4C-SiC powders. Carbon, 1995, 33(4): 397–403
Chakraborty N, Ficher W, Gupta A, Basu D. Performance of conventional CSZP-based ceramic coating on oxidation of carboncarbon composites. Surface and Coatings Technology, 2006, 201(3–4): 1152–1159
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Bobzin, K., Zhao, L., Schlaefer, T. et al. Development of oxide based diffusion barrier coatings for CFC components applied in modern furnaces. Front. Mech. Eng. 6, 392–396 (2011). https://doi.org/10.1007/s11465-011-0241-z
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DOI: https://doi.org/10.1007/s11465-011-0241-z