THERMAL SHOCK PROPERTIES OF YTTRIA-STABILIZED ZIRCONIA COATINGS DEPOSITED USING LOW-ENERGY VERY LOW PRESSURE PLASMA SPRAYING

Lin Zhu (), Nannan Zhang, Rodolphe Bolot, Hanlin Liao and Christian Coddet
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Lin Zhu: Laboratoire d′Etudes et de Recherches sur les Matériaux, les Procédés et les Surfaces, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France;
Nannan Zhang: Department of Materials Science and Engineering, Shenyang University of Technology, 110870, Shenyang, P. R. China
Rodolphe Bolot: Laboratoire d′Etudes et de Recherches sur les Matériaux, les Procédés et les Surfaces, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France
Hanlin Liao: Laboratoire d′Etudes et de Recherches sur les Matériaux, les Procédés et les Surfaces, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France
Christian Coddet: Laboratoire d′Etudes et de Recherches sur les Matériaux, les Procédés et les Surfaces, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, 90010 Belfort Cedex, France

Surface Review and Letters (SRL), 2015, vol. 22, issue 05, 1-11

Abstract: Yttria-stabilized zirconia (YSZ) coatings have been frequently used as a thermal protective layer on the metal or alloy component surfaces. In the present study,ZrO2-7%Y2O3thermal barrier coatings (TBCs) were successfully deposited by DC (direct current) plasma spray process under very low pressure conditions (less than 1 mbar) using low-energy plasma guns F4-VB and F100. The experiments were performed to evaluate the thermal shock resistance of different TBC specimens which were heated to 1373 K at a high-temperature cycling furnace and held for 0.5 h, followed by air cooling at room temperature for 0.2 h. For comparison, a corresponding atmospheric plasma spray (APS) counterpart was also elaborated to carry out the similar experiments. The results indicated that the very low pressure plasma spray (VLPPS) coatings displayed better thermal shock resistance. Moreover, the failure mechanism of the coatings was elucidated.

Keywords: Very low pressure plasma spray; thermal barrier coatings; thermal cycling; yttria-stabilized zirconia (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500614

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