Effects of crystal structure and cation size on molten silicate reactivity with environmental barrier coating materials

2019 ◽  
Vol 103 (1) ◽  
pp. 622-634 ◽  
Author(s):  
Jamesa L. Stokes ◽  
Bryan J. Harder ◽  
Valerie L. Wiesner ◽  
Douglas E. Wolfe
Keyword(s):  
Crystal Structure ◽  
Coating Materials ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating ◽  
Molten Silicate ◽  
Cation Size

Oxygen diffusion through environmental barrier coating materials

2020 ◽  
Vol 46 (11) ◽  
pp. 19545-19549 ◽  
Author(s):  
Guangxu Zhao ◽  
Baosheng Xu ◽  
Ke Ren ◽  
Gang Shao ◽  
Yiguang Wang
Keyword(s):  
Oxygen Diffusion ◽  
Coating Materials ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating

Luminescence thermometry for environmental barrier coating materials

2008 ◽  
Vol 203 (5-7) ◽  
pp. 461-465 ◽  
Author(s):  
M.D. Chambers ◽  
P.A. Rousseve ◽  
D.R. Clarke
Keyword(s):  
Coating Materials ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating ◽  
Luminescence Thermometry

Interaction between Y-Al-Si-O glass-ceramics for environmental barrier coating materials and Ca-Mg-Al-Si-O melts

2020 ◽  
Vol 46 (11) ◽  
pp. 18262-18273
Author(s):  
Juanli Deng ◽  
Baofu Lu ◽  
Kaiyue Hu ◽  
Hao Li ◽  
Jiahao Wang ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Coating Materials ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating

High-Temperature thermochemical interactions of molten silicates with Yb2Si2O7 and Y2Si2O7 environmental barrier coating materials

2019 ◽  
Vol 39 (15) ◽  
pp. 5059-5067 ◽  
Author(s):  
Jamesa L. Stokes ◽  
Bryan J. Harder ◽  
Valerie L. Wiesner ◽  
Douglas E. Wolfe
Keyword(s):  
High Temperature ◽  
Coating Materials ◽  
Environmental Barrier ◽  
Environmental Barrier Coating ◽  
Barrier Coating

scholarly journals Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE2O3 (RE = Sm, Eu, Er, Lu, Y, and Yb): Promising environmental barrier coating materials for Al2O3f/Al2O3 composites

2021 ◽  
Vol 10 (3) ◽  
pp. 596-613 ◽  
Author(s):  
Yanan Sun ◽  
Huimin Xiang ◽  
Fu-Zhi Dai ◽  
Xiaohui Wang ◽  
Yan Xing ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Expansion ◽  
Ceramic Matrix Composites ◽  
Mechanical And Thermal Properties ◽  
Coating Materials ◽  
Environmental Barrier ◽  
High Entropy ◽  
Thermal Expansion Coefficients ◽  
Environmental Barrier Coating ◽  
Barrier Coating

AbstractY2O3 is regarded as one of the potential environmental barrier coating (EBC) materials for Al2O3f/Al2O3 ceramic matrix composites owing to its high melting point and close thermal expansion coefficient to Al2O3. However, the relatively high thermal conductivity and unsatisfactory calcium-magnesium-aluminosilicate (CMAS) resistance are the main obstacles for the practical application of Y2O3. In order to reduce the thermal conductivity and increase the CMAS resistance, four cubic bixbyite structured high-entropy oxides RE2O3, including (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3, (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3, (Sm0.2Eu0.2Er0.2Y0.2Yb0.2)2O3, and (Sm0.2Eu0.2Lu0.2Y0.2Yb0.2)2O3 were designed and synthesized, among which (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 and (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 bulks were prepared by spark plasma sintering (SPS) to investigate their mechanical and thermal properties as well as CMAS resistance. The mechanical properties of (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 and (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 are close to those of Y2O3 but become more brittle than Y2O3. The thermal conductivities of (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 and (Sm0.2Er0.2Lu0.2Y0.2Yb0.2)2O3 (5.1 and 4.6 W·m−1·K−1) are only 23.8% and 21.5% respectively of that of Y2O3 (21.4 W·m−1·K−1), while their thermal expansion coefficients are close to those of Y2O3 and Al2O3. Most importantly, HE RE2O3 ceramics exhibit good CMAS resistance. After being attacked by CMAS at 1350 °C for 4 h, the HE RE2O3 ceramics maintain their original morphologies without forming pores or cracks, making them promising as EBC materials for Al2O3f/Al2O3 composites.

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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