Abstract: Ca0.6Mg0.4Zr4(PO4)6(C0.6M0.4ZP) coating on dense cordierite ceramic was prepared through sol-gel method and dip-coating technique. The phase composition and microstructure of the coating were characterized by XRD and SEM. The assessment of coating alkali corrosion resistance was done through the measurements of weight loss and flexural strength degradation after 48h and longer exposure time in alkali vapor corrosion at 1000℃. It is found that homogeneous, dense and single-phase C0.6M0.4ZP coating was successfully deposited on cordierite ceramic. SEM microstructural examination also reveals the excellent bonding between C0.6M0.4ZP coating and cordierite matrix. C0.6M0.4ZP coating has good alkali corrosion resistance property and can greatly improve the high temperature alkali corrosion resistance of the cordierite.

Key words: Ca0.6Mg0.4Zr4(PO4)6(C0.6M0.4ZP) coating on dense cordierite ceramic was prepared through sol-gel method and dip-coating technique. The phase composition and microstructure of the coating were characterized by XRD and SEM. The assessment of coating alkali corrosion resistance was done through the measurements of weight loss and flexural strength degradation after 48h and longer exposure time in alkali vapor corrosion at 1000℃. It is found that homogeneous, dense and single-phase C0.6M0.4ZP coating was successfully deposited on cordierite ceramic. SEM microstructural examination also reveals the excellent bonding between C0.6M0.4ZP coating and cordierite matrix. C0.6M0.4ZP coating has good alkali corrosion resistance property and can greatly improve the high temperature alkali corrosion resistance of the cordierite.