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 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.
Highlights
Thermal barrier coatings (TBCs) are used to limit the heat transfer through coatings and protect vital engine components from hot corrosion [1,2]
High operating temperatures result in the melting of any silicate that may be ingested by an engine [3,4]
The results studied by Li et al [14] show that rare-earth zirconates can resist CMAS corrosion in the early stage of the reaction
Summary
Thermal barrier coatings (TBCs) are used to limit the heat transfer through coatings and protect vital engine components from hot corrosion [1,2]. High operating temperatures result in the melting of any silicate (sand, dust, runway, debris, fly ash, volcanic ash, etc.) that may be ingested by an engine [3,4] These molten silicates, commonly referred to as calcium–magnesium–aluminum–silicate (CMAS), cause severe degradation of TBCs and premature delamination, exposing the metallic components to dangerous hot gases [5,6,7]. Evidence from previous research showed that rare-earth zirconates (such as Sm2Zr2O7) deteriorated slowly by CMAS with increasing penetration time [16,17,18]. This phenomenon may be related to subsequent changes in reaction products in excess CMAS. The reaction products of CMAS and Sm2Zr2O7 were accurately determined in this paper, and subsequent changes in the reaction products were studied
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