Funct. Mater. 2026; 32 (1): 115-120.
Optimization of thermal diffusion technology of Ni–Al–Si–Cr–La coatings for the protection of heat-resistant nickel alloys
1Kharkiv National Automobile and Highway University, 25 Yaroslava Mudrogo Str., 61002 Kharkiv, Ukraine
2Prydniprovska State Academy of Civil Engineering and Architecture, 24a Architect Oleh Petrov Str., 49000 Dnipro, Ukraine
An industrial technology for thermal diffusion deposition of complex-alloyed protective coatings of the Ni–Al–Si–Cr–La system on heat-resistant nickel alloys ChS-70VM and EP-539LM has been developed and optimized. Saturation was carried out in powder mixtures based on ferroaluminum, ferrosilicon, and specially smelted Fe–Al–Si master alloys (20–30% Al, 15–25% Si) with the activator Na2SiF6 at 900–950 °C. The influence of temperature and time conditions of saturation and subsequent annealing on the coating growth kinetics, phase composition, and microstructure of the base was determined. It was shown that the optimal conditions (quenching at 1160°C + aging at 1050°C + saturation at 950°C, 6–8 hours) provide a coating thickness of 40–60 µm, a microhardness of 7500–9000 MPa, and the preservation of the structural stability of the γ′-phase of the alloy. The coatings demonstrate twice the heat resistance and corrosion resistance in diesel fuel combustion products with the addition of sea salt compared to traditional aluminide coatings. Bench and engine tests (600 hours) confirmed the resource efficiency of the developed technology.
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