The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat
The durability of atmospheric plasma-sprayed thermal barrier coatings (APS TBCs) with a double-layer bond coat was evaluated via isothermal cycling tests under 1120 °C. The bond coat consisted of a porosity layer deposited on the substrate and an oxidation layer deposited on the porosity la...
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doaj-3c1b6d7e725c4d73aa3e2730c830189d2020-11-25T00:07:01ZengMDPI AGCoatings2079-64122019-04-019424110.3390/coatings9040241coatings9040241The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond CoatXiao Li0Xin-Yu Peng1Hui Dong2Yong Zhou3Tao Wang4Kang Ren5Liang Sun6School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaSchool of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, ChinaThe durability of atmospheric plasma-sprayed thermal barrier coatings (APS TBCs) with a double-layer bond coat was evaluated via isothermal cycling tests under 1120 °C. The bond coat consisted of a porosity layer deposited on the substrate and an oxidation layer deposited on the porosity layer. Two types of double-layer bond coats with different thickness ratios of the porosity layer to the oxidation layer (type A: 1:2 and type B: 2:1, respectively) were prepared. The results show that the porosity layer was oxidation free, the oxidation layer included a fraction of well-distributed α-Al<sub>2</sub>O<sub>3</sub>. The coefficient of thermal expansion of the oxidation layer was about 11.2 × 10<sup>−6</sup> K<sup>−1</sup>, which was rather lower than that of the porosity layer. Thus, the oxidation layer can be regards as a secondary bond coat between ceramic topcoat and traditional bond coat. The thermal cyclic lifetime of type A TBCs was about 60 cycles, which exceeded 1.2 times the durability of type B TBCs. The delamination cracks in both TBCs all propagated in the ceramic topcoat, which were all identical to those in traditional TBCs. Therefore, the design of the double-layer bond coat affected the stress level rather than the stress distribution in TBCs.https://www.mdpi.com/2079-6412/9/4/241plasma sprayingthermal barrier coatings (TBCs)double-layer bond coatcoefficient of thermal expansionthermally grown oxide (TGO) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiao Li Xin-Yu Peng Hui Dong Yong Zhou Tao Wang Kang Ren Liang Sun |
spellingShingle |
Xiao Li Xin-Yu Peng Hui Dong Yong Zhou Tao Wang Kang Ren Liang Sun The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat Coatings plasma spraying thermal barrier coatings (TBCs) double-layer bond coat coefficient of thermal expansion thermally grown oxide (TGO) |
author_facet |
Xiao Li Xin-Yu Peng Hui Dong Yong Zhou Tao Wang Kang Ren Liang Sun |
author_sort |
Xiao Li |
title |
The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat |
title_short |
The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat |
title_full |
The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat |
title_fullStr |
The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat |
title_full_unstemmed |
The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat |
title_sort |
evaluation of durability of plasma-sprayed thermal barrier coatings with double-layer bond coat |
publisher |
MDPI AG |
series |
Coatings |
issn |
2079-6412 |
publishDate |
2019-04-01 |
description |
The durability of atmospheric plasma-sprayed thermal barrier coatings (APS TBCs) with a double-layer bond coat was evaluated via isothermal cycling tests under 1120 °C. The bond coat consisted of a porosity layer deposited on the substrate and an oxidation layer deposited on the porosity layer. Two types of double-layer bond coats with different thickness ratios of the porosity layer to the oxidation layer (type A: 1:2 and type B: 2:1, respectively) were prepared. The results show that the porosity layer was oxidation free, the oxidation layer included a fraction of well-distributed α-Al<sub>2</sub>O<sub>3</sub>. The coefficient of thermal expansion of the oxidation layer was about 11.2 × 10<sup>−6</sup> K<sup>−1</sup>, which was rather lower than that of the porosity layer. Thus, the oxidation layer can be regards as a secondary bond coat between ceramic topcoat and traditional bond coat. The thermal cyclic lifetime of type A TBCs was about 60 cycles, which exceeded 1.2 times the durability of type B TBCs. The delamination cracks in both TBCs all propagated in the ceramic topcoat, which were all identical to those in traditional TBCs. Therefore, the design of the double-layer bond coat affected the stress level rather than the stress distribution in TBCs. |
topic |
plasma spraying thermal barrier coatings (TBCs) double-layer bond coat coefficient of thermal expansion thermally grown oxide (TGO) |
url |
https://www.mdpi.com/2079-6412/9/4/241 |
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