Abstract No.:
7304

 Scheduled at:
Wednesday, May 04, 2022, Hall -2.32/33 2:40 PM
Suspension Spraying I


 Title:
A study of the high-density nanostructured ceramic coating prepared by low-pressure suspension plasma spraying (LPSPS)

 Authors:
Shiming Xie / UTBM, France
Hanlin Liao / UNIVERSITE DE TECHNOLOGIE DE BELFORT(UTBM),
Chen Song/ Guangdong Institute of New Materials,
Frederic Lapostolle/ UNIVERSITE DE TECHNOLOGIE DE BELFORT(UTBM),
Didier Klein/ UNIVERSITE DE TECHNOLOGIE DE BELFORT(UTBM),
Chunming Deng/ Guangdong Institute of New Materials,
Min Liu/ Guangdong Institute of New Materials,
S. Liu/ UTBM, France
C. Verdy*/ UTBM,

 Abstract:
The high-density nanostructured coating has great potential in many fields like wear-resistant coating and electrolyte layer of solid oxide fuel cell (SOFC). Suspension plasma spraying (SPS) is one of the most effective methods for the preparation of nanostructured coatings. However, it is challenging for conventional SPS methods to deposit high-density coating due to the low momentum of the particles in that case. Recently, a novel suspension spraying technology – low-pressure suspension plasma spraying (LPSPS) – was proposed. This technology was developed on the platform of low-pressure plasma spraying (LPPS), in which the suspension spraying is carried out under low pressure using a specific plasma torch. Benefit from the significant impact of low pressure on the coating deposition, LPSPS is expected to prepare a much denser coating than SPS.
In this study, a developed LPSPS system is introduced, mainly including a homemade bio-cathode axial torch and a vacuum system. Then, YSZ electrolyte and lanthanum silicate electrolyte were deposited by using the developed LPSPS processes. The results showed that the density of the lanthanum silicate electrolyte was higher than that of the YSZ electrolyte and that the gas permeability of the former was lower than that of the latter. Both electrolytes exhibited a low gas permeability in the order of magnitude of 10-17 m2, even in a rather low thickness (30~50 ?m). Moreover, they all exhibited a high crystallinity, and no amorphous phase was formed in the lanthanum silicate electrolyte. These results indicate that LPSPS has a huge potential in the preparation of the electrolyte of SOFC.


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