Oxidation behavior of double-ceramic-layer thermal barrier coatings deposited by atmospheric plasma spraying and suspension plasma spraying
Oxidation behavior of double-ceramic-layer thermal barrier coatings deposited by atmospheric plasma spraying and suspension plasma spraying
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DOI：
10.1016/j.ceramint.2022.05.068
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发表时间：
2022-05
影响因子：
5.2
通讯作者：
Yuxiang Zhao;Yuxue Ge;X. Jin;D. Koch;R. Vaßen;Yao Chen;Xueling Fan
中科院分区：
文献类型：
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作者：
Yuxiang Zhao;Yuxue Ge;X. Jin;D. Koch;R. Vaßen;Yao Chen;Xueling Fan
研究了大气等离子喷涂(APS)和悬浮等离子喷涂(SPS)制备的新型双层陶瓷热障涂层(DCL-TBCs)的氧化行为。制备了四种具有致密/多孔柱状组织和垂直裂纹组织的APS-SPS DCL热障涂层。测试了APS-SPS-DCL热障涂层的氧化行为，并对其氧化机理进行了进一步探讨。结果表明，所研制的APS-SPS DCL热障涂层具有比单层SPS热障涂层更好的抗氧化性能。在长期氧化过程中，热生长氧化物(TGO)可分为外层混合氧化物和内层Al_2O_3两层，氧化过程中TGO中混合氧化物的生长速率发生变化。在氧化速率和氧化寿命方面，节段式APS-SPS热障涂层的性能略好于柱状APS-SPS热障涂层。在四种不同的APS-SPS热障涂层中，垂直裂纹密度较低的分段致密APS-SPS热障涂层具有更大的工业应用潜力。
This paper focuses on the oxidation behavior of novel double-ceramic-layer thermal barrier coatings (DCL TBCs) deposited by atmospheric plasma spraying (APS) and suspension plasma spraying (SPS). Four kinds of APS-SPS DCL TBCs with dense/porous columnar structured or vertically cracked microstructures were prepared. The oxidation behavior of the APS-SPS DCL TBCs were tested and the underlying mechanisms were further discussed. Results showed that the developed APS-SPS DCL TBCs have a better oxidation resistance than the single layer SPS TBC that was tested for comparison. In the long-term oxidation, the thermally grown oxide (TGO) can be divided into two layers, the outer mixed oxide and inner Al2O3layer, in which the growth rate of mixed oxide in TGO changed during oxidation. In terms of the oxidation rate and oxidation lifetime, segmented APS-SPS TBCs has a slightly better performance than the columnar APS-SPS TBCs. Among the four different APS-SPS TBCs, the segmented dense APS-SPS TBCs with low vertical crack density appears to have more potential to be used for industrial application.