High-temperature corrosion resistance of different rare-earth tantalate-doped Cr2O3 thermal barrier materials

Better anti-corrosion protection is essential for the service life of thermal barrier materials. This study investigates the corrosion behaviors of RE2CrTaO7 and CMAS at high temperatures. Results revealed that RE2CrTaO7 exhibits good corrosion resistance as a new thermal barrier material. Meanwhile, the chemical stability and compactness of the crystal structure of Sm2CrTaO7, exhibiting pyrochlore structure, are better than those of Yb2CrTaO7, exhibiting defective fluorite structure. Therefore, the anti-corrosion effect of Sm2CrTaO7 is also better than that of Yb2CrTaO7. After being corroded by CMAS for 10 h, the thickness of the dissolution and reaction layer of Yb2CrTaO7 is 67.49 ??m. However, the Sm2CrTaO7 is only 33.69 ??m under the same conditions.

Automated summary

This study investigates the corrosion behaviors of RE2CrTaO7 and CMAS at high temperatures, and reveals that RE2CrTaO7 exhibits good corrosion resistance. The chemical stability and compactness of the crystal structure of Sm2CrTaO7 are better than those of Yb2CrTaO7, resulting in a better anti-corrosion effect for Sm2CrTaO7. After being corroded by CMAS for 10 hours, the thickness of the dissolution and reaction layer is 67.49 ??m for Yb2CrTaO7, while it is only 33.69 ??m for Sm2CrTaO7.