CMAS corrosion behavior of LaMgAl11O19/CeO2 ceramic materials

Alumina based ceramic materials, such as LaMgAl11O19 (LMA) containing amounts of Al, usually resist the CMAS corrosion through forming a compact layer of the CaAl2Si2O8. In this work, the LMA/CeO2 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/CeO2, the CeO2 and the LMA ceramic bulks were tested and compared at 1250 degrees C and 1350 degrees C for 1 h, 5 h and 10 h. Results showed that the added CeO2 in the LMA can decrease the porosity and improve the resistance to CMAS corrosion. The combined effects of the LMA and CeO2 promoted the formation of the CaAl2Si2O8. The L5C5 and the L9C1 with appropriate composition have good resistance to CMAS corrosion at 1250 degrees C, and the L9C1 can alleviate CMAS infiltration compared with the LMA and other proportional materials at 1350 degrees C.