Versatility of potential protective layer material Ti2AlC on resisting CMAS corrosion to thermal barrier coatings
Versatility of potential protective layer material Ti2AlC on resisting CMAS corrosion to thermal barrier coatings
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DOI：
10.1016/j.corsci.2020.108532
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发表时间：
2020-02
影响因子：
8.3
通讯作者：
Zheng Yan;Lei Guo;Zhaoyang Zhang;Xiaohui Wang;F. Ye
中科院分区：
文献类型：
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作者：
Zheng Yan;Lei Guo;Zhaoyang Zhang;Xiaohui Wang;F. Ye
减轻钙镁铝硅酸盐（CMAS）对热障涂层（TBCs）的危害已引起人们的广泛关注。在这里，我们证明了Ti2AlC是一种很有前途的保护层材料的热障涂层对CMAS攻击，并阐明其耐腐蚀机制。结果表明，预氧化Ti2AlC在促进CMAS晶化和抑制熔体渗透方面具有明显的优势。预氧化在Ti2AlC表面生成连续的Al2O3层和TiO2颗粒，Al2O3与熔融CMAS反应生成钙长石晶体，而TiO2以富钛颗粒或钛溶解的形式（存在含量阈值）促进晶化。
Alleviating calcium-magnesium-alumina-silicate (CMAS) hazard to thermal barrier coatings (TBCs) has attracted increasing attentions. Here, we demonstrate that Ti2AlC is a promising protective layer material for TBCs against CMAS attack, and clarify its corrosion resistance mechanisms. The results reveal that pre-oxidized Ti2AlC has obvious advantages over its non-oxidized counterpart on promoting CMAS crystallization and inhibiting the melt infiltration. Pre-oxidation produces a continuous Al2O3layer and TiO2particles on Ti2AlC surface, and Al2O3reacts with molten CMAS to form anorthite crystals, while TiO2, in the form of either Ti-rich particles or Ti dissolution (there is a content threshold), promotes the crystallization.