Abstract
Corrosion behavior of calcium-magnesium-alumina-silicate (CMAS) coated on LaMgAl11O19/Yb2SiO5/Si environmental barrier coatings are studied. The results show that a dense layer of anorthite is formed under short-term corrosion at 1300 °C (>5 h). After 25 h, CMAS melt penetrates and dissolves the LaMgAl11O19 layer along the pores, crystallizing with the Yb2SiO5 front. At 1400 °C for 5 h, the CMAS melt reacts vigorously with the coating and penetrates the LaMgAl11O19 layer, forming large pores and the production of garnet solid solution and Ca2(Yb, La)8(SiO4)6O2. After 50 h, the Yb2SiO5 layer completely dissolves, leaving residual CMAS on top of the thermally grown oxide layer.
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