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Effect of Particle Size on the Micro-cracking of Plasma-Sprayed YSZ Coatings During Thermal Cycle Testing

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Abstract

The failure of plasma-sprayed thermal barrier coatings (TBCs) during service or thermal cycle testing usually results from internal cracking in the top coat, erosion and CMAS (calcium-magnesium-alumina-silicate)-induced damage, etc. The microstructure of ceramic coatings affects their durability and other properties of TBCs. In the present study, yttria-stabilized zirconia (YSZ) coatings were deposited by atmospheric plasma spraying (APS) using feedstocks with different particle sizes. In addition, the effect of particle size on damage evolution in the top coat was investigated. It is found that the coatings deposited using coarse particles show the higher thermal cycle life. Crack length grew with increasing numbers of thermal cycles. The faster crack growth rate can be found for the coatings deposited from fine particles. The porosity of the coating made from the coarse powder is larger than the porosity of the coating made from fine powder both in the as-sprayed condition and after thermal cycling. The changes in crack growth rate and the porosity are related to the effect of sintering and stress evolution in coatings during the thermal cyclic tests.

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Acknowledgments

The authors gratefully appreciate the support of National Natural Science Foundation (No. 51275172), Science and Technology Commission of Shanghai Municipality Project (Nos. 14DZ2261205, 16DZ2260604), Aviation funding (2015ZES7001, 2013ZFS7001) and Shanghai Pujiang Program (15PJD009).

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Authors and Affiliations

  1. Key Laboratory of Pressure System and Safety, Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China

    Jibo Huang, Weize Wang, Jingye Yu, Liangmin Wu & Zhengqu Feng

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  1. Jibo Huang
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  2. Weize Wang
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  3. Jingye Yu
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  4. Liangmin Wu
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Correspondence to Weize Wang.

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Huang, J., Wang, W., Yu, J. et al. Effect of Particle Size on the Micro-cracking of Plasma-Sprayed YSZ Coatings During Thermal Cycle Testing. J Therm Spray Tech 26, 755–763 (2017). https://doi.org/10.1007/s11666-017-0547-4

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  • DOI: https://doi.org/10.1007/s11666-017-0547-4

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