Feasibility study of plasma sprayed Al<sub>2</sub>O<sub>3</sub> coatings as diffusion barrier on CFC components

Kirsten BOBZIN; Lidong ZHAO; Nils KOPP; Thomas WARDA

doi:10.1007/s11465-012-0339-y

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Front. Mech. Eng. ›› 2012, Vol. 7 ›› Issue (4) : 371-375. DOI: 10.1007/s11465-012-0339-y

RESEARCH ARTICLE

Feasibility study of plasma sprayed Al₂O₃ coatings as diffusion barrier on CFC components

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Abstract

Carbon fibre reinforced carbon (CFC) materials are increasingly applied as sample carriers in modern furnaces. Only their tendency to react with different metals at high temperatures by C-diffusion is a disadvantage, which can be solved by application of diffusion barriers. Within this study the feasibility of plasma sprayed Al₂O₃ coatings as diffusion barrier was studied. Al₂O₃ coatings were prepared by air plasma spraying (APS). The coatings were investigated in terms of their microstructure, bonding to CFC substrates and thermal stability. The results showed that Al₂O₃ could be well deposited onto CFC substrates. The coatings had a good bonding and thermal shock behavior at 1060°C. At higher temperature of 1270°C, crack network formed within the coating, showing that the plasma sprayed Al₂O₃ coatings are limited regarding to their application temperatures as diffusion barrier on CFC components.

Keywords

diffusion barrier coatings / CFC / plasma spraying / microstructure / Al₂O₃

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Kirsten BOBZIN, Lidong ZHAO, Nils KOPP, Thomas WARDA. Feasibility study of plasma sprayed Al₂O₃ coatings as diffusion barrier on CFC components. Front Mech Eng, 2012, 7(4): 371‒375 https://doi.org/10.1007/s11465-012-0339-y

References

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[3]	Bobzin K, Zhao L, Schlaefer T, Warda T. Development of oxide based diffusion barrier coatings for CFC components applied in modern furnaces. Frontiers of Mechanical Engineering, 2011, 6(4): 392–396

Acknowledgements

The IGF Project No. 14.880N/DVS No. 2.050 of the Research Association on Welding and Allied Processes of the German Welding Society (DVS) was, on the basis of a resolution of the Lower House of the German Parliament, promoted by the German Federal Ministry of Economics and Technology (BMWi) via AiF within the framework of the programme for promotion of joint industrial research and development (IGF). The authors thank all the participants for the funding and support.