Mechanical Properties and CMAS Corrosion Resistance of La₂Ce₂O₇/YSZ Composite Thermal Barrier Coatings

50 vol. % La₂Ce₂O₇ (LC)/yttria partially stabilized zirconia (YSZ) composite thermal barrier coating (TBC) was deposited by supersonic atmospheric plasma spraying (SAPS). The mixture of LC and YSZ can effectively eliminate the sudden decrease of thermal expansions coefficients of LC. The results of CMAS corrosion tests indicated that the LC/YSZ composite coating reveals high resistance to the penetration of CMAS with reprecipitation of La-Ce apatite, CaAl₂Si₂O₈, MgAl₂O₄ and t-ZrO₂. Furthermore, compared to YSZ coating, the LC/YSZ composite coating can obviously improve the thermal cycling lives under CMAS corrosion.