Print Email Facebook Twitter Damage evolution in a self-healing air plasma sprayed thermal barrier coating containing self-shielding MoSi 2 particles Title Damage evolution in a self-healing air plasma sprayed thermal barrier coating containing self-shielding MoSi 2 particles Author Chen, Ying (The University of Manchester) Zhang, Xun (The University of Manchester) van der Zwaag, S. (TU Delft Novel Aerospace Materials) Sloof, W.G. (TU Delft (OLD) MSE-1) Xiao, Ping (The University of Manchester; Shanghai Jiao Tong University) Date 2019 Abstract A self‐healing thermal barrier coating (TBC) system is manufactured by air plasma spraying (APS) and tested by thermal cycling. The ceramic topcoat in the self‐healing APS TBC system consists of an yttria stabilised zirconia (YSZ) matrix and contains self‐shielding aluminium containing MoSi2 healing particles dispersed close to the topcoat/bond coat interface. After spraying the healing particles the material was annealed to promote the formation of an oxygen impermeable Al2O3 shell at the MoSi2‐TBC interfaces by selective oxidation of the aluminium fraction. The samples were subsequently thermally cycled between room temperature and 1100°C. The study focussed on the spontaneous formation of the Al2O3 shell as well as the subsequent damage evolution in the APS produced TBC during thermal cycling. Experimental evidence showing characteristic signs of crack healing in the topcoat is identified and analysed. The study shows that while the concept of the self‐healing APS TBCs containing self‐shielding MoSi2 particles is promising, future study is needed to improve the protectiveness of the Al2O3 shells by further tailoring the aluminium content in the MoSi2 and the particle shape to avoid the premature oxidation of the healing particles and maximise crack healing efficiency. Subject Al-containing MoSiAPS TBCoxidationself-healingself-shieldingthermal cycling To reference this document use: http://resolver.tudelft.nl/uuid:45c811fd-920a-47d7-80f8-71e67026e2df DOI https://doi.org/10.1111/jace.16313 Embargo date 2020-01-01 ISSN 0002-7820 Source Journal of the American Ceramic Society, 102 (8), 4899-4910 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2019 Ying Chen, Xun Zhang, S. van der Zwaag, W.G. Sloof, Ping Xiao Files PDF jace.16313.pdf 2.64 MB Close viewer /islandora/object/uuid:45c811fd-920a-47d7-80f8-71e67026e2df/datastream/OBJ/view