METHOD OF PRODUCING NANOSTRUCTURED COATING OF TITANIUM-NICKEL-HAFNIUM WITH HIGH-TEMPERATURE SHAPE MEMORY EFFECT ON STEEL Russian patent published in 2017 - IPC C23C4/129 C23C24/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to deformation-thermal treatment of titanium-nickel-hafnium coatings with shape memory effect, and can be used in metallurgy, machine building and medicine. Method of producing nanostructured coating of titanium-nickel-hafnium with high-temperature shape memory effect on steel involving application of powder TiNiHf by high-rate flame spraying, performance of plastic deformation of coating in four steps, at first stage in temperature range 500–550 °C with degree of plastic deformation ε=6–9 %, at second stage in temperature range 570–600 °C with degree of plastic deformation ε=9–12 %, at third stage in temperature range 600–700 °C with degree of plastic deformation ε=12-15%, at fourth stage in temperature range 850–890 °C with degree of plastic deformation ε=15–40 %, wherein after each stage of plastic deformation annealing is carried out at temperature of 500–600 °C for 2–3 hours, and further tempering at temperature of 900–950 °C with subsequent cooling. Plastic deformation of coating is implemented by rolling with three-roller device in radial direction in protective argon medium and when passing electric current in zone of contact of three-roller device with coating Ti-Ni-Hf. Coating Ti-Ni-Hf with shape memory effect contains 19–23 % of hafnium.

EFFECT: production of multifunctional nanostructured coating with shape memory effect is provided.

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