Abstract: Coatings deposited by detonation spraying equipment CCDS2000 using alumina powder are studied. CCDS2000 is characterized by a computer control system, robot compatible spraying unit (gun barrel), a portable chiller, two powder feeders, and other peculiar properties. This installation allows to deposit coatings on complex shape surfaces and thin-walled parts under optimal conditions. Studies of the coating properties included measurements of coating microstructure, porosity, microhardness, adhesion, cohesion, abrasive and erosive wear, and dielectric properties (specific resistivity and dielectric strength). The detonation sprayed coatings have an adhesion of 60-70 MPa, cohesion of 100 MPa, microhardness of 1500 HV100, porosity of about 1% (measured on microsections of coatings using OLYMPUS Stream Image Analysis software). Impregnation of coatings with silicone oil showed that the real open porosity of coatings is up to 6%. Dielectric strength of the ceramic layer with the thickness of 200 µm exceeds 30 kV/mm. Specific resistivity depends on atmospheric humidity and when the relative humidity is less than 60%, the specific resistivity is greater than 1013 Ω·cm.

Cite: Ulianitsky V. , Shtertser A.A. , Batraev I. , Smurov I.
Properties of Alumina Coatings Deposited by Detonation Spraying
Materials Science Forum. 2021. V.1016. P.1350-1355. DOI: 10.4028/www.scientific.net/MSF.1016.1350 Scopus РИНЦ OpenAlex

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Scopus:	2-s2.0-85100886993
Elibrary:	46752120
OpenAlex:	W3119819103

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