CMAS corrosion behavior of LaMgAl11O19/CeO2 ceramic materials.

Alumina based ceramic materials, such as LaMgAl 11 O 19 (LMA) containing amounts of Al, usually resist the CMAS corrosion through forming a compact layer of the CaAl 2 Si 2 O 8. In this work, the LMA/CeO 2 mixed powders in mole ratios of 5:5 (L5C5), 7:3 (L7C3) and 9:1 (L9C1) were pressed and sintered to prepare the ceramic bulks. The resistance to CMAS corrosion of the LMA/CeO 2 , the CeO 2 and the LMA ceramic bulks were tested and compared at 1250ºC and 1350ºC for 1 h, 5 h and 10 h. Results showed that the added CeO 2 in the LMA can decrease the porosity and improve the resistance to CMAS corrosion. The combined effects of the LMA and CeO 2 promoted the formation of the CaAl 2 Si 2 O 8. The L5C5 and the L9C1 with appropriate composition have good resistance to CMAS corrosion at 1250ºC, and the L9C1 can alleviate CMAS infiltration compared with the LMA and other proportional materials at 1350ºC. [ABSTRACT FROM AUTHOR]