NUST MISIS scientists have developed a unique technology for applying protective coatings to critical components and components of modern technology. According to the researchers, the original structure of the resulting coating provides 1.5 times corrosion resistance and high temperature oxidation compared to prior art solutions.
Coating design obtained by using Cr3C2–NiAl electrodes through VESA-PCAE-MS mixing technology
Research results published in the International Journal of Ceramics. The originality of this technology lies in combining the advantages of three deposition methods based on different physical principles in a single technical vacuum cycle. Using these methods, scientists from MISIS University obtained multi-layer coatings with high wear resistance, corrosion resistance and heat resistance.
“For the first time, we have obtained a protective coating sputtering (MS) from electrodes based on chromium carbide and NiAl (Cr 3 C 2 - NiAl) adhesives by sequentially implementing electrospark alloying (ESA), cathode arc deposition (CDO), and magnetron methods. Philip Kiryukhantsev-Korneev, head of the laboratory “Structural Conversion In-Site Diagnosis” at the Center for SVS Research and Education, said the created coating has a component microstructure that allows you to combine the benefits of all three methods. .
VISA (a), PCA (b), MS (c) and VESA-PC GAMES (d) Wear marks of coating under 1 N load 3D image
According to him, the surface was initially treated in vacuum by the ESA method, which ensured that the Cr 3 C 2 - NiAl electrode material was transferred to the product, thus providing high adhesion of the coating to the substrate. In the second stage of the BWW, ions flying out of the cathode fill the defects of the first layer, repairing the cracks and forming a denser structural uniform layer with high corrosion resistance.
In the third stage, MN Methods formed a stream of atoms to smooth the surface relief. As a result, a sealed heat-resistant top layer was formed, which prevented oxygen from diffusion from the corrosive medium. "Using a transmission electron microscope to study the structure of each layer, two protective effects were found - as the underlying layer of the substance increased the bearing capacity, sealing defects appeared during the next two layers of deposition.
As a result, the three-layer coating obtained was one and a half times higher than the base coating, both in the corrosion and high temperature oxidation in liquid and gaseous media. This is a very important result, no exaggeration," said Kilikhantsev-Kornev.
According to scientists, this coating will increase the service life and performance of propulsion systems, refining pumps and other key components that are simultaneously worn and corroded. In the near future, scientists plan to expand the scope of combined technologies related to high temperature titanium and nickel alloy modification.
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