Military operations occurring in particle-laden environments have resulted in aircraft incidents and loss of life due to sand ingestion into the engine. Sand melts in the hot combustion environment and deposits as glassy calcia–magnesia–alumino–silicates (CMAS) which leads to rapid performance degradation due to clogged air pathways in the engine. A novel, composite thermal barrier coating (TBC) consisting of yttria-stabilized zirconia (YSZ) blended with gadolinia is proposed that combines the excellent thermo-mechanical properties of YSZ together with the CMAS resistance of rare-earth oxides. YSZ was blended with 2, 8, 17, and 32 vol% gadolinia and tested under simulated engine-relevant conditions. The presence of gadolinia in the composite coating reduced the adhesion of the CMAS, and at 32 vol% gadolinia addition, the CMAS was completely delaminated. A possible CMAS adhesion mitigating mechanism is discussed. This work demonstrated the capability of a new composite TBC to significantly reduce CMAS adhesion.

在充满尘埃的环境中进行的军事行动已导致飞机事故并由于沙子被吸入发动机而导致生命损失。沙在热的燃烧环境中融化并沉积为玻璃状氧化钙-镁-铝-硅酸盐（CMAS），由于发动机中的空气通道堵塞，导致性能快速下降。提出了一种新颖的，由氧化钇稳定的氧化锆（YSZ）与氧化ado混合而成的复合热障涂层（TBC），该涂层结合了YSZ的出色的热机械性能以及稀土氧化物的CMAS耐受性。将YSZ与2％，8％，17％和32％的氧化ado混合，并在与发动机相关的模拟条件下进行测试。复合涂层中存在氧化ado降低了CMAS的附着力，当添加32vol％氧化g时，CMAS已完全分层。讨论了可能的CMAS附着力减轻机制。这项工作证明了新型复合TBC能够显着降低CMAS附着力。