A method has been developed for the synthesis of titanium nanocomposites

Scientists at the Ural Federal University (UrFU) and the Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences have developed a method for assembling coatings made of four nanocomponents. It is used to protect gas turbine engines, in aircraft and machine building, for metalworking, and in biomedicine. The new approach does not require high temperatures, additional equipment or materials, and allows to obtain coatings with the desired properties. Experimental results and method description It was published in the magazine membranes.

Nano-composite coatings based on titanium, silicon, carbon and nitrogen are promising for use as corrosion resistant protective coatings due to their unique set of properties. Today, these four-component coatings are manufactured using a number of physical and chemical methods, but they have drawbacks. Scientists have proposed a method of chemical plasma decomposition, which shows the best results in obtaining the final coatings.

“Compared with the vacuum arc method, the advantage is that there are no small droplets that reduce the quality of the coating. Unlike magnetron spraying, our method provides higher deposition rates, high density of ion flux necessary to form dense and high-quality layers. If you compare it with the chemical method, the advantage is the use of Environmentally friendly and hygienic components, affordable, inexpensive.The main advantage of this method, in our opinion, is the possibility of independently and within a wide range of control in almost all installation conditions and, accordingly, the composition and properties of the obtained coating, which makes it possible to obtain films with Required “characteristics”, says Andrey Menshakov, researcher at UrFU and the Ural branch of RAS.

The new method is relatively easy to implement: only a gas-discharge device with a hollow cathode and an active anode is used to create a multicomponent active medium. This deposition method does not require separate facilities, ionization and filtration systems because the evaporated metal flow does not contain any droplets that disturb the coating structure.

“The nanostructure of such a coating is generally an amorphous matrix with nanocrystals embedded in it. To obtain coatings of multicomponent nanocomposites, we use organosilicon precursors – low toxic volatile liquids containing silicon-carbon-nitrogen bonds that participate in the reactions that lead To form the final structure.To assemble a nano-crystalline phase consisting of titanium-nitrogen, titanium-carbon, or titanium-carbon-nitrogen crystals, we add titanium to the precursor gas environment by evaporating it by electron flow from the plasma.Thus, we create a vapor gas environment Active consisting of the decomposition products of organic silicon particles and titanium vapor, the components of this mixture forming a coating on the treated surface, ”explains Menshakov.

The researchers note that companies, having the necessary production technology, are now creating facilities for applying such protective coatings for various enterprises. Using the new method could improve the energy efficiency of existing facilities, as well as the quality of the resulting films. When determining specific requirements for obtaining coatings, for example, on medicinal products or cutting tools, it is necessary to individually select the installation conditions that will help to obtain coatings with the necessary properties. Scientists are now working on this very task of manufacturing coatings with the required mechanical, physical and chemical properties.

– This press release was originally published on the Ural Federal University website

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