Corrosion behavior and thermos-physical properties of a promising Yb2O3 and Y2O3 co-stabilized ZrO2 ceramic for thermal barrier coatings subject to calcium-magnesium-aluminum-silicate (CMAS) deposition: experiments and first-principles calculation

2021 ◽  
pp. 109230
Author(s):  
Huanjie Fang ◽  
Weize Wang ◽  
Jibo Huang ◽  
Yuanjun Li ◽  
Dongdong Ye
Keyword(s):  
Physical Properties ◽  
Thermal Barrier Coatings ◽  
Corrosion Behavior ◽  
First Principles ◽  
First Principles Calculation ◽  
Aluminum Silicate ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Magnesium Aluminum Silicate ◽  
Calcium Magnesium

scholarly journals Failure mechanisms of calcium magnesium aluminum silicate affected thermal barrier coatings

2017 ◽  
Vol 100 (6) ◽  
pp. 2679-2689 ◽  
Author(s):  
John Thornton ◽  
Chris Wood ◽  
Justin A. Kimpton ◽  
Mitchell Sesso ◽  
Matthew Zonneveldt ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Failure Mechanisms ◽  
Aluminum Silicate ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Magnesium Aluminum Silicate ◽  
Calcium Magnesium

scholarly journals Reaction products of Sm2Zr2O7 with calcium-magnesium- aluminum-silicate (CMAS) and their evolution

2021 ◽  
Author(s):  
Yinghua Wang ◽  
Zhuang Ma ◽  
Ling Liu ◽  
Yanbo Liu
Keyword(s):  
Thermal Barrier Coatings ◽  
Aluminum Silicate ◽  
Thermal Barrier ◽  
Reaction Products ◽  
Barrier Coatings ◽  
Magnesium Aluminum Silicate ◽  
Composition Segregation ◽  
Calcium Magnesium ◽  
New Generation ◽  
Sand Dust

Abstract During flight, many silicates (sand, dust, debris, fly ash, etc.) are ingested by an engine. They melt at high operating temperatures on the surface of Thermal barrier coatings (TBCs) to form calcium-magnesium-aluminum-silicate (CMAS) amorphous settling. CMAS erodes TBCs and causes many problems, such as composition segregation, degradation, cracking, and disbanding. As a new generation of TBC candidate materials, rare-earth zirconates (Sm2Zr2O7) have good CMAS resistance properties. The reaction products of Sm2Zr2O7 and CMAS and their subsequent changes were studied by the reaction of Sm2Zr2O7 and excess CMAS at 1350°C. After 1 h of reaction, Sm2Zr2O7 powders were not completely eroded. The reaction products were Sm-apatite and c-ZrO2 solutions. After 4 h of reaction, all Sm2Zr2O7 powders were completely eroded. After 24 h of reaction, Sm-apatite disappeared, and the c-ZrO2 solution remained.

scholarly journals Reaction products of Sm2Zr2O7 with calcium-magnesium-aluminum-silicate (CMAS) and their evolution

2021 ◽  
Author(s):  
Yinghua Wang ◽  
Zhuang Ma ◽  
Ling Liu ◽  
Yanbo Liu
Keyword(s):  
Solid Solution ◽  
Aluminum Silicate ◽  
Thermal Barrier ◽  
Reaction Products ◽  
Barrier Coatings ◽  
Magnesium Aluminum Silicate ◽  
Composition Segregation ◽  
Calcium Magnesium ◽  
New Generation ◽  
Sand Dust

AbstractDuring flight, many silicates (sand, dust, debris, fly ash, etc.) are ingested by an engine. They melt at high operating temperatures on the surface of thermal barrier coatings (TBCs) to form calcium-magnesium-aluminum-silicate (CMAS) amorphous settling. CMAS corrodes TBCs and causes many problems, such as composition segregation, degradation, cracking, and disbanding. As a new generation of TBC candidate materials, rare-earth zirconates (such as Sm2Zr2O7) have good CMAS resistance properties. The reaction products of Sm2Zr2O7 and CMAS and their subsequent changes were studied by the reaction of Sm2Zr2O7 and excess CMAS at 1350 °C. After 1 h of reaction, Sm2Zr2O7 powders were not completely corroded. The reaction products were Sm-apatite and c-ZrO2 solid solution. After 4 h of reaction, all Sm2Zr2O7 powders were completely corroded. After 24 h of reaction, Sm-apatite disappeared, and the c-ZrO2 solid solution remained.

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