Water vapor volatilization and oxidation induced surface cracking of environmental barrier coating systems: A numerical approach

2021 ◽  
Author(s):  
Bowen Lv ◽  
Zhaoliang Qu ◽  
Baosheng Xu ◽  
Yiguang Wang ◽  
Daining Fang
Keyword(s):  
Water Vapor ◽  
Numerical Approach ◽  
Environmental Barrier ◽  
Surface Cracking ◽  
Environmental Barrier Coating ◽  
Barrier Coating

scholarly journals Water vapor and CMAS corrosion tests of Si/Y2SiO5 Thermal and Environmental Barrier Coating

2021 ◽  
Author(s):  
Qi Zhang ◽  
Xueqin Zhang ◽  
Zhuang Ma ◽  
Ling Liu ◽  
Yanbo Liu ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Corrosion Test ◽  
Environmental Barrier ◽  
Alkali Salt ◽  
High Temperature Water ◽  
Environmental Barrier Coating ◽  
Barrier Coating ◽  
High Temperature Steam ◽  
Temperature Water

Abstract Thermal and environmental barrier coating (TEBC), the up-to-date concept, is introduced to protect silicon-based ceramics matrix composites (CMC) from not only high temperature water vapor but also the alkali salt from volcanic ash and dust suspending in atmosphere. Because both of high temperature steam and CMAS will make Si-based CMC deteriorate rapidly. By executing the corrosion test against high temperature water vapor, we find that Si/Y2SiO5 double-layer TEBC can effectively protect SiCf/SiC CMC from water vapor at 1300 ℃ for over 205 hours. Almost all Y2SiO5 transform into Y4.67(SiO4)3O after corrosion test. It is also found that in CMAS corrosion test, the reaction zone formed between CMAS and Y2SiO5 layer prevents the mutual diffusion of elements in CMAS and Y2SiO5 layer. The apparent activation energy of reaction between CMAS and Y2SiO5 in 1200~1300℃ temperature ranges is calculated to be 713.749kJ/mol. These findings provide a reference to select appropriate materials for TEBC.

Corrosion Behavior of AlPO4 as Environmental Barrier Coating in Water Vapor Enviroment

2009 ◽  
Vol 24 (2) ◽  
pp. 397-401 ◽  
Author(s):  
Xian-Hong CHEN ◽  
Lai-Fei CHENG ◽  
Yi-Guang WANG ◽  
Li-Tong ZHANG ◽  
Zhi-Liang HONG ◽  
...  
Keyword(s):  
Water Vapor ◽  
Corrosion Behavior ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating

Fabrication and Water-vapor Corrosion Resistance of Ba0.25Sr0.75Al2Si2O8 Environmental Barrier Coating

2011 ◽  
Vol 26 (7) ◽  
pp. 701-706 ◽  
Author(s):  
Lin-Jing LU ◽  
Lai-Fei CHENG ◽  
Zhi-Liang HONG ◽  
Yi-Guang WANG ◽  
Li-Tong ZHANG
Keyword(s):  
Corrosion Resistance ◽  
Water Vapor ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating ◽  
Water Vapor Corrosion

scholarly journals Rear Earth Oxide Multilayer Deposited by Plasma Spray-Physical Vapor Deposition for Envisaged Application as Thermal/Environmental Barrier Coating

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 889
Author(s):  
Jie Zhong ◽  
Dongling Yang ◽  
Shuangquan Guo ◽  
Xiaofeng Zhang ◽  
Xinghua Liang ◽  
...  
Keyword(s):  
Composite Coating ◽  
High Temperatures ◽  
Physical Vapor Deposition ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Environmental Barrier ◽  
Chemical Attack ◽  
Environmental Barrier Coating ◽  
Barrier Coating

SiC fiber-reinforced SiC ceramic matrix composites (SiCf/SiC CMCs) are being increasingly used in the hot sections of gas turbines because of their light weight and mechanical properties at high temperatures. The objective of this investigation was the development of a thermal/environmental barrier coating (T/EBC) composite coating system consisting of an environmental barrier coating (EBC) to protect the ceramic matrix composites from chemical attack and a thermal barrier coating (TBC) that insulates and reduces the ceramic matrix composites substrate temperature for increased lifetime. In this paper, a plasma spray-physical vapor deposition (PS-PVD) method was used to prepare multilayer Si–HfO2/Yb2Si2O7/Yb2SiO5/Gd2Zr2O7 composite coatings on the surface of SiCf/SiC ceramic matrix composites. The purpose of this study is to develop a coating with resistance to high temperatures and chemical attack. Different process parameters are adopted, and their influence on the microstructure characteristics of the coating is discussed. The water quenching thermal cycle of the coating at high temperatures was tested. The results show that the structure of the thermal/environmental barrier composite coating changes after water quenching because point defects and dislocations appear in the Gd2Zr2O7 and Yb2SiO5 coatings. A phase transition was found to occur in the Yb2SiO5 and Yb2Si2O7 coatings. The failure mechanism of the T/EBC composite coating is mainly spalling when the top layer penetrates cracks and cracking occurs in the interface of the Si–HfO2/Yb2Si2O7 coating.

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