METHOD OF PRODUCING NANOCOMPOSITE COATING FROM SILICON DIOXIDE WITH NANOPARTICLES OF MOLYBDENUM DISULPHIDE Russian patent published in 2019 - IPC C23C18/12 C23C16/50 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing coatings from nanocomposite materials by chemical deposition from a gas phase, in particular, to a method of forming on a substrate a nanocomposite coating consisting of a silicon dioxide matrix with uniformly distributed nanoparticles of molybdenum disulphide. Molybdenum disulphide nanoparticles and silicon dioxide vapours are simultaneously condensed in a reactor on a substrate at atmospheric pressure to achieve the required coating thickness, wherein nanoparticles of molybdenum disulphide are obtained in the upper part of the reactor, which is heated to 750–900 °C by pyrolysis of ammonium thiomolybdate solution in dimethylformamide with concentration of 0.635–2.6 g/l. Then said molybdenum disulphide nanoparticles are transferred with helium flow at flow rate of 0.1–1 l/min into reactor bottom zone, which is heated to temperature of 25–300 °C. In said lower zone of the reactor, silicon dioxide vapours are formed by feeding helium tetraethoxysilane vapour at a flow rate of 0.1–1 l/min and decomposing thereof under the effect of corona discharge generated between the metal electrode and the grounded stage with said substrate when fed to a metal electrode alternating current of 1.8–2.2 kV.

EFFECT: providing a wear-resistant nanocomposite coating from silicon dioxide with homogeneous distribution of nanoparticles of molybdenum disulphide, having high density and low coefficient of friction.

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