The effect of porosity, mixed molecular/Knudsen diffusion, and a surface barrier layer on steam corrosion of Yb2Si2O7

被引：10

作者：

McCormack, Simon ^{[1
]}

Cao, Huatang ^{[1
]}

Martins, Joao P. ^{[1
]}

Withers, Philip J. ^{[1
]}

Xiao, Ping ^{[1
]}

机构：

[1] Univ Manchester, Henry Royce Inst, Dept Mat, Manchester M13 9PL, England

来源：

CORROSION SCIENCE | 2023年 / 219卷

基金：

英国工程与自然科学研究理事会;

关键词：

Environmental barrier coatings; Silicate; Steam corrosion; Ceramic matrix composites; WATER-VAPOR CORROSION; OXYGEN POTENTIAL GRADIENTS; MASS-TRANSFER; YTTERBIUM DISILICATE; RECESSION BEHAVIOR; COATINGS; PHASE;

D O I：

10.1016/j.corsci.2023.111238

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Yb2Si2O7 is a promising candidate environmental barrier coating (EBCs) for ceramic aero-engine components. The effect of microstructure, especially porosity, on steam corrosion of Yb2Si2O7 was studied for sintered compacts of different porosities at 1350 degrees C. A porous layer of Yb2SiO5 formed on the surface, with the level of porosity determining corrosion rate independent of grain size. Mixed molecular/Knudsen diffusion significantly reduced effective gaseous diffusion through the pores. A thin deposit of dense Yb3Al5O12 on the surface offered protection from corrosion suggesting that microstructural control of pore formation and the inclusion of Al2O3 in Yb2Si2O7 coatings can have significant beneficial effects steam corrosion resistance of EBCs.

引用

页数：12