Dependence of the elastic modulus of powder coatings on their porosity in electrical contact hardening
DOI:
https://doi.org/10.31891/2079-1372-2021-102-4-28-33Keywords:
electric contact method for forming coatings, powder coatings, porosity, elastic modulus, mechanical properties, adhesion strengthAbstract
The relationship between the elastic modulus and the porosity of powder coatings has been investigated for different methods of their deposition. Porosity is the main means of assessing the quality of coatings and depends on the techniques for their production. A decrease in the elastic modulus of coatings after gas flame spraying is due to the presence of porosity to 30%, and after electric arc spraying – to 20%. The electric contact method of forming coatings makes it possible to reduce porosity to 5-6% and so to bring the value of the elastic modulus of coatings closer to that of compact materials.
References
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3. Kupriyanov I.L., Ivashko V.S., Sakhadze V.M. et al. Metal-polymer coatings for protection of agricultural machinery from corrosion. Tractors and agricultural machines. 1985. No. 10. P. 38-40.
4. Kuznetsov V.V., Klyshko I.N. Application of enamel frits for melting of sprayed coatings / Technological processes and equipment for hardening of machine parts, tools, and technological equipment: Proc. of scientific and technical conf. Minsk: BelNIINTI.
5. Korobov Yu.S. Calculation of the parameters of motion, heating and oxidation of particles in electric arc metallization. /Welding production. 1998. No. 3. P. 9-13.
6. Kudinov V.V. Plasma coatings. Moscow: Nauka, 1977. 184 p.
7. Ergashev M., Matyakubov B. Features of obtaining hardened coatings by the electric contact method / Automatic welding. 1986. No. 5. P. 49 - 51.
8. Engineering of the surface of transport mas0chine parts: current state, perspectives. Newsletter / Collection of Science Practices of Transport University and Transport Academy of Ukraine. Iss. 4, Kyiv, RVV NTU, 2000. P. 3-14.
9. Routes to improvement of methods for engineering the surface of transport machine parts. Metody obliczeniowe i badawcze w rozwoju pojazdow samochodowych i maszyn roboczych samojezdnych, 2000. P. 20-23.
10. Electric contact hardening as a method of engineering the surface of parts of transport equipment when prepared and restored. Newsletter / Collection of Science Practices of Transport University and Transport Academy of Ukraine. Iss. 4, Kyiv, RVV NTU. 2000. P. 3-6.
11. Electrical contact hardening as a mechanical-thermal method of surface quality control. Сollection: Materials, technologies and equipment for restoration of machine parts. Minsk: UP Technoprint, Novopolotsk, PSU. 2003. P. 252-254.
12. Yaroshevich V.K., Genkin Ya.S., Vereshchagin V.A. Electric contact hardening. Minsk: Science and Technology, 1982. P. 256.
13. Lyashenko B.A., Rishin V.V., Astakhov E.A., Sharivker S.Yu. Investigation of the adhesion strength of detonation-sprayed coatings / Problems of strength. 1972.
14. Race Roy W. Effects of inhomogeneous porosity on elastic properties of ceramic properties of ceramics. J. Amer. Ceram. Soc. Discussion and Notes. 1975. Vol. 58. No. 9-10. P. 458-459.
15. Hasselman D.P.H., Fulrath R.M. Effect of small fraction of spherical porosity on elastic modulus of glass. J. Amer. Ceram. Soc. Discussion and Notes. 1964. Vol. 47. No. 1. P. 52-53.
16. Loskutov V.S., Dekhtyar L.I. Mechanical properties of plasma-sprayed coatings from zirconium boride, copper and their compositions. Powder metallurgy. Kyiv. 1985. No. 7. P. 78-81.
17. Antonova E.A., Burkova L.I. Residual thermal stresses in sintered coatings. Anticorrosion coatings. L.: Nauka. 1983. P. 4-42.
18. Skorokhod V.V. Powder materials based on refractory metals and compounds. Kyiv: Tekhnika, 1982. 167 p.
19. Kharlamov Yu.A. Prediction of the porosity of powder coatings. Powder metallurgy. 1990. No. 12. P. 36-41.
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Published
2021-12-23
How to Cite
Lopata, O., Smirnov, I., Zinkovskii, A., & Lopata, L. (2021). Dependence of the elastic modulus of powder coatings on their porosity in electrical contact hardening. Problems of Tribology, 26(4/102), 28–33. https://doi.org/10.31891/2079-1372-2021-102-4-28-33
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