Influence of Cr 2 AlC additive on the properties and corrosion resistance of Cr 2 O 3 ‐Al 2 O 3 refractories

Le résumé fourni par la source

Abstract Cr 2 O 3 ‐containing refractories are widely applied to the harsh service environments, such as coal water slurry gasifiers and various nonferrous metallurgical processes. The Cr 2 O 3 ‐Al 2 O 3 solid solution in the high chrome brick, as the main bonding system, has an adverse effect on the high‐temperature properties of the Cr 2 O 3 ‐containing refractories of the final production. In this work, the incorporation of Cr 2 AlC into the conventional Cr 2 O 3 ‐Al 2 O 3 as additive was carried out, and the effect of Cr 2 AlC on the high‐temperature properties and corrosion resistance was investigated. The results indicated that the residual strength ratio still maintained stability when the content of Cr 2 AlC added was 5%. While the corrosion resistance index of the sample with 5wt% Cr 2 AlC‐adding increased approximately 50% compared with the regular Cr 2 O 3 ‐Al 2 O 3 refractories. In addition, the degradation mechanism of the Cr 2 O 3 ‐Al 2 O 3 refractories after the addition of Cr 2 AlC in contact with slag was studied, and the role of Cr 2 AlC was elucidated.

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