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

doi:10.1007/s11465-012-0339-y

Front Mech Eng

2012, Vol. 7

Issue (4) : 371-375 https://doi.org/10.1007/s11465-012-0339-y

RESEARCH ARTICLE

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

Kirsten BOBZIN, Lidong ZHAO(

), Nils KOPP, Thomas WARDA

Surface Engineering Institute, RWTH Aachen University, 52072 Aachen, Germany

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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

Corresponding Author(s): ZHAO Lidong,Email:zhao@iot.rwth-aachen.de

Issue Date: 05 December 2012

Cite this article:

Kirsten BOBZIN,Lidong ZHAO,Nils KOPP, et al. Feasibility study of plasma sprayed Al₂O₃ coatings as diffusion barrier on CFC components[J]. Front Mech Eng, 2012, 7(4): 371-375.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-012-0339-y
https://academic.hep.com.cn/fme/EN/Y2012/V7/I4/371

Tab.1 Spray parameters

Fig.1 Sample temperature measured with a thermocouple fixed in a hole on the backside of the sample during spraying

Fig.2 Photograph of a coated CFC sample without a bond coat after scratch testing with a normal load of 30 N

Fig.3 Micrograph of an AlO coating on the CFC substrate without a bond coat

Fig.4 Micrograph of an AlO coating on the CFC substrate with the W bond coat

Fig.5 Micrograph of an AlO coating on the CFC substrate with the SiC bond coat

Fig.6 Indentation at the interface between the AlO coating and the CFC substrate

Fig.7 An AlO coated sample before and after wetting test with B-Ni2 at 1060°C

Fig.8 Photograph of a coated sample with the SiC bond coat after 10 cycles at 1270°C

Fig.9 X-ray diffraction patterns of the AlO coating as sprayed and after 10 cycles at 1270°C

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