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Calcium–magnesium aluminosilicate corrosion of barium–strontium aluminosilicates with different strontium content

Ceramics International, ISSN: 0272-8842, Vol: 43, Issue: 1, Page: 212-221
2017
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Article Description

In this study, the hot corrosion of barium–strontium aluminosilicate (B 1−x S x AS) attacked by calcium–magnesium aluminosilicate (CMAS) was investigated at temperatures in the 1200–1400 °C range. Moreover, a corrosion mechanism based on the interdiffusion of Ba/Sr and Ca cations was also proposed. The proposed corrosion mechanism indicated the diffusion of Ba/Sr cations into the CMAS, and Ca cations into the B 1−x S x AS during the hot corrosion process. At 1200 °C, a thin corrosion zone was formed at the interface of B 1−x S x AS and CMAS due to weak diffusion of Ba/Sr and Ca cations. Further increase in the temperature led to an enhancement in the interdiffusion of Ba/Sr and Ca cations, thus significantly widening the corrosion zone. Moreover, oriental dendrites, identified as monoclinic B 1−x S x AS, were found to precipitate in the molten CMAS. Attributed to the faster diffusion rate of Sr cations compared to that of the Ba cations, B 1−x S x AS with a higher Sr content was found to be more prone to CMAS-induced corrosion due to the rapid loss of Sr.

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