TPWJ, 2019, #9, 23-29 pages
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #9, 2019 (October)
Heat-resistant thermal sprayed coatings based on FeAlCr intermetallide with CeO2 additives
Yu.S. Borisov1, A.L. Borisova1, T.V. Tsymbalista1, N.I. Kaporik1 and M.A. Vasilkovskaya2
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
Frantsevich Institute for Problems of Materials Science
3 Krzhizhanovskogo Str., 03680, Kyiv, Ukraine. E-mail: email@example.com
The paper presents the results of studying the heat resistance of coatings, produced by the methods of plasma (PS) and high-velocity oxy-fuel spraying (HVOF), using composite powder based on FeAlCr with addition of 2 wt.% CeO2
, as well as by the methods of electric arc metallization (EM) and activated electric arc metallization (AM) with using of flux-cored wire of the following composition: 98(82Fe + 16Al + 2Cr) + 2CeO2
(wt.%). Composite powder was prepared by the method of mechanochemical synthesis (MS) by treating a mixture of powder components in a planetary-type mill. Heat resistance testing was performed in air at 800, 900 and 1000 °C for 7 h by weight method. Coating structure after heat resistance testing was studied with application of metallographic and X-ray structural analysis (XRD). It is found that during testing of coatings produced by PS and HVOF methods the delamination phenomenon is observed, whereas coatings produced by AM and EM methods preserve a tight bond strength with the substrate. Obtained kinetic curves of heat resistance showed that in the entire time interval of testing at 800–1000 °C the oxidation mechanism follows the parabolic law. The data of kinetic dependencies were used to plot the parametric heat resistance diagrams, allowing evaluation of fatigue life time of the studied protective coatings in the temperature range of 800–1000 °C. The highest heat resistance is found in FeAlCrCeO2
coatings produced by AM and EM methods with using of flux-cored wire. At 1000 °C it exceeds the resistance of steel 45 by 23-26 times, and corresponds to heat resistance of 08Cr17Ti steel. 12 Ref., 2 Tables, 8 Figures.
Keywords: thermal spraying, electric arc spraying, iron-aluminium intermetallides, mechanochemical synthesis, composite powder, flux-cored wire, parametric heat resistance diagram, FeAlCr–CeO2 system
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