Calcium-magnesium-alumina-silicate (CMAS) resistance property of BaLn2Ti3O10 (Ln=La, Nd) for thermal barrier coating applications

The effect of TiO2 additions on CaO–MgO–Al2O3–SiO2 (CMAS) crystallization behavior from the melt

“…However, preliminary studies on RE titanates and CMAS suggest that reaction products include apatite, as well as a Ca/Ti‐rich phase. Apatite and CaTiO 3 have also been reported as reaction products between a RE/Ti‐containing TBC material, BaLn 2 Ti 3 O 10 (Ln=La, Nd), and CMAS …”

A comparative study of calcium–magnesium–aluminum–silicon oxide mitigation in selected self-healing thermal barrier coating ceramics

“…Based on the XRD spectra, no new phases form after CMAS exposure, suggesting that no reaction occurred between CMAS and these coatings. The very broad peak between 20°and 35°corresponds to CMAS that became amorphous as a result of the heating at 1250°C for 10 h [26]. These results indicated that CMAS did not interact with the coating and that the glassy CMAS had mostly remained at the top of the sample.…”

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

“…By having an additional lower temperature (900°C) hold after the high temperature exposure, the addition of >10 wt-% TiO 2 is seen to induce precipitation of melitite, paqueite, and diopside, in addition to the calcium titanate phase that precipitates at higher temperature. Studies on Ti containing rare-earth titanates (Ba(La, Nd) 2 Ti 3 O 10 ) showed that apatite and CaTiO 3 phases were reaction products upon reacting with CMAS at 1250°C [121]. Furthermore, the consumption of CaO from the CMAS melt to form calcium titanate increases glass viscosity.…”