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Surface Engineering Volume 37, 2021 - Issue 5: Special Issue: Fabrication
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Research Articles

Influence of mechanical properties on thermal shock resistance of TBCs

Minghao GaoShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaORCID Iconhttps://orcid.org/0000-0001-5651-0868View further author information
ORCID Icon,
Na XuShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaView further author information
,
Jia ZhangShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaView further author information
,
Shengjia LuanShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaView further author information
,
Hui ChangShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaView further author information
,
Wanliang HouShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaView further author information
&
Xinchun ChangShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of ChinaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-9507-1228View further author information
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Pages 572-580 | Received 21 Mar 2020, Accepted 14 Aug 2020, Published online: 31 Aug 2020
 
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ABSTRACT

In this study, thermal barrier coatings with different porosities were prepared using 8 wt-% yttria-stabilized zirconia by atmospheric plasma spray on a superalloy substrate. The porosity of the ceramic coating was increased by modulating the primary gas flow rate and the secondary gas flow rate. The elastic modulus and fracture toughness of the coatings were measured by the indentation method, and the thermal shock resistance was evaluated by quenching the samples from 1050°C to room temperature. The Vickers hardness and elastic modulus of the coating were decreased by increasing the volume of the pores, and the fracture toughness was enhanced. It was found that the thermal shock resistance was improved owing to the stress release due to the pores.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Science and Technology on Scramjet Laboratory [grant number 6142703190303].

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