Authors: F.I. Panteleenko, V.A. Okovity, V.V. Okovity, V.V. Uglov

Title of the article: Formation of coatings on the basis of zirconium dioxide on the elements of screens of anti-elementary protection

Year: 2018, Issue: 6, Pages: 94-100

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.793.71

DOI: 10.26730/1999-4125-2018-6-94-100

Abstract: The article contains results research of influence of parameters a plasma jet (current, spraying distance, plasma gas consumption) fractional composition of the starting powder and the degree of cooling compressed air on anti-meteoric coating characteristics. We get an anti-meteoric coatings based on zirconia at optimum modes (arc current -600A; spray distance of 110 mm; plasma gas consumption 50 l/min; fractional composition of zirconia powder <50 microns; air consumption for cooling 1 m3/min; p = 4 bar) with materials utilization rate -62%, total porosity of the ceramic layer -6%. Cubic zirconia modification is the main phase present in the coating after exposure to coating compression plasma flows in a nitrogen atmosphere. The lattice parame-ter of cubic zirconia is 0.5174 nm . Because of the use of nitrogen as the plasma substance is its interaction with the atoms and zirconium coating is formed from zirconia nitride-ZrN with a cubic crystal lattice (lattice parameter 0.4580 nm). The melting of the surface layer occurs, and the depth of the molten layer, according to a scanning electron microscope is about 8 microns. Crystallized surface layer after exposure to compression plasma flows is characterized by a homogeneous distribution of the elements and the absence of pores formed in the formation of the coating. The structure of the coating represented by a set of large (5 - 7 microns) and small (1 - 2 microns) of zirconium oxide particles sintered together.

Key words: plasma jet anti-meteoric coating coefficient of utilization of material compression plasma flows cubic modification of zirconia

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