Suppressing CMAS attack with a MoSiB-based coating
Suppressing CMAS attack with a MoSiB-based coating
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DOI：
10.1016/j.surfcoat.2013.11.032
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发表时间：
2014-01
影响因子：
5.4
通讯作者：
I. P. Downs;J. Perepezko;R. Sakidja;S. R. Choi
中科院分区：
文献类型：
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作者：
I. P. Downs;J. Perepezko;R. Sakidja;S. R. Choi
熔融的 CMAS（氧化钙-氧化镁-铝硅）沉积物会渗透燃气轮机发动机中的热障涂层 (TBC) 并与其相互作用，从而降低氧化锆基 TBC 和整体 TBC 性能。为了解决 CMAS 攻击，已经提出了一些基于密封 TBC 或改变 TBC 组成的方法。提出了一种基于 MoSiB 基涂层通过包埋的应用的新策略。在两种天然 CMAS 砂和一种常用的合成 CMAS 上评估了 Mo 基底上的 MoSiB 基涂层与 CMAS 之间的相互作用。 MoSiB 基涂层通过原位反应阻止 CMAS 熔体渗透，该反应产生的结晶产物可固定 CMAS。事实证明，该涂层设计可有效防止在温度高达至少 1500 °C 的等温暴露期间以及热循环期间发生 CMAS 攻击。
Molten CMAS (calcia–magnesia–aluminosilica) deposits penetrate and interact with thermal barrier coatings (TBCs) in gas-turbine engines to degrade the zirconia-based TBCs and the overall TBC performance. To address the CMAS attack some approaches have been advanced based upon sealing the TBC or altering the TBC composition. A new strategy is presented based upon the application of a MoSiB based coating applied by pack cementation. The interaction between the MoSiB-based coating on a Mo substrate and CMAS is evaluated on two types of natural CMAS sands and on a commonly studied synthetic CMAS. The MoSiB-based coating arrests CMAS melt penetration by an in-situ reaction that yields crystallization products that act to immobilize the CMAS. The coating design is demonstrated to be effective in preventing CMAS attack during isothermal exposure at temperatures up to at least 1500 °C and during thermal cycling.