Suppressing CMAS attack with a MoSiB-based coating

被引：19

作者：

Downs, I. P. ^{[1
]}

Perepezko, J. H. ^{[1
]}

Sakidja, R. ^{[1
]}

Choi, S. R. ^{[2
]}

机构：

[1] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

[2] Naval Air Syst Command, Patuxent River, MD 20670 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 2014年 / 239卷

关键词：

CMAS; MoSiB based coating; Pack cementation; Oxidation; THERMAL BARRIER COATINGS; OXIDATION-RESISTANT COATINGS; HIGH-TEMPERATURE ATTACK; DELAMINATION; DEGRADATION; MECHANISMS;

D O I：

10.1016/j.surfcoat.2013.11.032

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 degrees C and during thermal cycling. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：138 / 146

页数：9

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