Hot corrosion behaviour of rare-earth magnesium hexaaluminate based thermal barrier coatings under molten sulphate-vanadate salts

Add time:09/01/2019    Source:sciencedirect.com

Hot corrosion behaviour of rare earth magnesium hexaaluminate (REMHA) based thermal barrier coatings (TBCs) such as i) lanthanum magnesium hexaaluminate (LMHA), ii) neodymium doped LMHA (LNMHA) and iii) LNMHA-yttrium aluminium garnet composite were investigated and compared with standard yttria stabilized zirconia (YSZ). The hot corrosion was carried out at 1050 °C for 100 h under molten sulphate-vanadate salts. REMHA shows superior hot corrosion resistance than YSZ. The hot corrosion reaction zone and the morphology of corrosion product are highly influenced by the rare earths in the coating. LNMHA has the best hot corrosion resistance and can meet the requirement of advanced TBC.

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