Abstract Aero-engine turbine blades should be coated for protection to improve the high temperature oxidation resistance of the alloy substrate. In this study, an Al-Si coating was prepared on the surface of NiCrW-based superalloy with CaCl2 as the activator by slurry method. X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy spectrometer (EDS) were used to analyze the surface and cross-section of the coating. The results show that the aqueous solution of polyvinyl alcohol can be used as an effective binder for preparing aluminized/aluminized-silicon coatings by slurry method, and the temperature and the heating time of high-temperature diffusion significantly affect the thickness of the aluminized coating. When the composition of binder is 5%Si+30%Al (mass fraction), the coating is composed of aluminum-rich layer, NiAl layer and silicon-containing transition layer from the outside to the inside. The NiAl coating is dense and has no obvious defects, and the thickness is about 57 μm. While the compositions of binder are 10%Si+25%Al, 15%Si+20%Al and 20%Si+15%Al, the coatings are divided into three layers: Aluminum-rich layer, nickel-rich layer and silicon-containing transition layer from the outside to the inside. Silicon is mainly exist in the silicon-containing transition layer in the form of silicon-containing deposition phases, and a small amount of silicon is deposited on the outer layer. The addition of a small amount of Si can significantly affect the diffusion process of aluminum and nickel elements, and reduce the thickness of the coating, and transform the phase of the coating from a single NiAl phase to an aluminum-rich phase, nickel-rich phase.
GAO Shan,ZOU Jianpeng. Microstructure and properties of Al-Si coating on NiCrW-based superalloy prepared by slurry method[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 155-165.
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2021, Vol. 26 
