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1145 |
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Tuesday, June 03, 2008, Room 05 10:50 AM Case Studies and Further Applications 1 Showing the broad variety of thermal spraying in different examples, special processes and also specialized materials apart from standard coatings offer new possibilities and also new markets |
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Airtight coatings produced by very low pressure plasma spraying
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Christophe Verdy* / LERMPS-UTBM, FRANCE Chao Zhang / LERMPS-UTBM, FRANCE Dmitri Sokolov/ LERMPS-UTBM, FRANCE Hanlin Liao/ LERMPS-UTBM, FRANCE Didier Klein/ LERMPS-UTBM, FRANCE Christian Coddet/ LERMPS-UTBM, FRANCE |
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A certain level of porosity is always present in ceramic thermal spray coatings. LPPS or some specific APS processes can allow to reduce this but it is difficult to obtain coatings with a low thickness (less than 100 micrometers) which are fully airtight because of cracks or interconnected pores. This airtight property is for example very suitable for the ceramic electrolyte of solide oxide fuel cells (SOFC). Some ZrO2-Y2O3 coatings were obtained by the VLPPS process, a LPPS system operating at a pressure of about 100 Pa. The specific structure of these coatings is a mixture of condensed vapours and splats. The results are very satisfying because ZrO2-Y2O3 coatings with a thickness of 60 micrometers are airtight under a hydrogen pressure of 2.105 Pa. This paper presents some PSZ coatings obtained by different processes (APS, LPPS and VLPPS) and their properties. |