Badini Claudio, Deambrosis Silvia M, Padovano Elisa, Fabrizio Monica, Ostrovskaya Oxana, Miorin Enrico, D'Amico Giuseppe C, Montagner Francesco, Biamino Sara, Zin Valentina
Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy.
National Research Council (CNR) of Italy, Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia (ICMATE), Corso Stati Uniti 4, Padova 35127, Italy.
Materials (Basel). 2016 Nov 25;9(12):961. doi: 10.3390/ma9120961.
A High Power Impulse Magnetron Sputtering (HiPIMS) method for depositing TiAlN environmental barrier coatings on the surface of Ti-48Al-2Cr-2Nb alloy was developed in view of their exploitation in turbine engines. Three differently engineered TiAlN films were processed and their performance compared. Bare intermetallic alloy coupons and coated specimens were submitted to thermal cycling under oxidizing atmosphere up to 850 °C or 950 °C, at high heating and cooling rates. For this purpose, a burner rig able to simulate the operating conditions of the different stages of turbine engines was used. Microstructures of the samples were compared before and after each test using several techniques (microscopy, XRD, and XPS). Coating-intermetallic substrate adhesion and tribological properties were investigated too. All the TiAlN films provided a remarkable increase in oxidation resistance. Good adhesion properties were observed even after repeated thermal shocks. HiPIMS pretreatments of the substrate surfaces performed before the coating deposition significantly affected the oxidation rate, the oxide layer composition and the coating/substrate adhesion.
鉴于Ti-48Al-2Cr-2Nb合金在涡轮发动机中的应用，开发了一种用于在其表面沉积TiAlN环境障涂层的高功率脉冲磁控溅射（HiPIMS）方法。制备了三种不同设计的TiAlN薄膜，并对其性能进行了比较。将裸露的金属间合金试样和涂覆试样在高达850°C或950°C的氧化气氛中以高加热和冷却速率进行热循环。为此，使用了一种能够模拟涡轮发动机不同阶段运行条件的燃烧试验台。每次测试前后，使用多种技术（显微镜、XRD和XPS）对样品的微观结构进行比较。还研究了涂层与金属间基体的附着力和摩擦学性能。所有TiAlN薄膜的抗氧化性都有显著提高。即使在反复热冲击后，仍观察到良好的附着力。在涂层沉积之前对基体表面进行的HiPIMS预处理显著影响氧化速率、氧化层成分和涂层/基体附着力。
