Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 17, Pages 20798-20807Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.08.081
Keywords
Gradient coating; Al2O3; TiO2; NiCoCrAl; Crack propagation
Categories
Funding
- Yunnan Province Key Research and Development Program [2018BA067]
- Yunnan Province Science and Technology Major Project [2018ZE009]
- National Natural Science Foundation of China [51401097]
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In this paper, an Al2O3-40 wt%TiO2/NiCoCrAl gradient coating is deposited by atmospheric plasma spraying (APS). The microstructure and element distribution of the coating are studied by scanning electron microscopy (SEM) and electron probe X-ray microanalysis (EPMA). The crack propagation behaviour in the coating under applied and thermal stress is analysed through a three-point bending test and a thermal shock test, respectively. Two rapid propagation processes of the cracks can be found during the three-point bending test, which lead to two peaks in the load-displacement curves of the gradient coating. The gradual change in the composition also has an effect on the crack propagation process within the coating. Non-directional propagation paths of cracks and the formation of oxides can be observed in the gradient region under the effect of thermal stress, which lead to the spallation failure of the coating.
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