Development of oxide based diffusion barrier coatings for CFC components applied in modern furnaces

doi:10.1007/s11465-011-0241-z

Front Mech Eng

2011, Vol. 6

Issue (4) : 392-396 https://doi.org/10.1007/s11465-011-0241-z

RESEARCH ARTICLE

Development of oxide based diffusion barrier coatings for CFC components applied in modern furnaces

Kirsten BOBZIN, Lidong ZHAO(

), Thomas SCHLAEFER, Thomas WARDA

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

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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 C-diffusion 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%βY₂O₃ (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.

Keywords diffusion barrier coatings carbon fibre reinforced carbon (CFC) plasma spraying microstructure furnace

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

Issue Date: 05 December 2011

Cite this article:

Kirsten BOBZIN,Lidong ZHAO,Thomas SCHLAEFER, et al. Development of oxide based diffusion barrier coatings for CFC components applied in modern furnaces[J]. Front Mech Eng, 2011, 6(4): 392-396.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-011-0241-z
https://academic.hep.com.cn/fme/EN/Y2011/V6/I4/392

Tab.1 Spray parameters

Fig.1 Micrograph of a mullite coating on the CFC substrate without SiC bond coat

Fig.2 Micrograph of a mullite coating on the CFC substrate with SiC coating

Fig.3 Micrograph of a mullite coating on the CFC substrate with W bond coat

Fig.4 Micrograph of a YSZ coating on the CFC substrate with W bond coat

Fig.5 Micrograph of a YSZ coating with a micro crack after thermal cycle test

Fig.6 Photograph of the mullite coated sample after wetting test

Fig.7 Photograph of a YSZ coated sample after wetting test

Fig.8 Photograph of the contact area of a braze alloy ball

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