放电等离子烧结 AlCoCrFeNiTiSi 高熵合金作为先进热障涂层的粘结层

Industry is raising turbine inlet temperatures to boost aircraft engine efficiency, especially for future hydrogen-fuelled propulsion. These harsher conditions demand robust protection of high-pressure turbine blades and vanes against high-temperature oxidation and corrosion. High-entropy alloys (HEAs) used as bond coats in advanced thermal barrier coatings (TBCs) offer a promising route to mitigate interfacial instabilities from high-temperature interdiffusion, yet their high-temperature phase stability and coupled thermo-mechanical behaviour remain poorly understood.Here, we design a series of spark-plasma-sintered AlCoCrFeNiTiSi HEAs engineered for high-temperature phase stability, oxidation resistance and spallation resistance. From a single nominal composition, varying SPS conditions produce samples with different phase assemblages, which have allowed us to study how phase composition and thermodynamics control the evolution of the oxide scale over 500 h at 1100 °C.