Microstructure and Oxidation Performance of TiAl-(Cr, Nb, Ta) Coatings Fabricated by Warm Spray and High-Velocity Oxy-Fuel Spraying

Judyta Sienkiewicz , Seiji Kuroda , Hideyuki Murakami , Hiroshi Araki , Maciej Giżyński , Krzysztof Kurzydłowski

Abstract

To improve the oxidation resistance of near atitanium alloy IMI834, TiAl-(Cr, Nb, Ta) coatings were deposited by applying high-velocity oxy-fuel (HVOF) and warm spray (WS). Comparison was made in terms of microstructure, surface morphology as well as isothermal and cyclic oxidation behaviors in the air at 750 _C up to 100 h and 100 cycles, respectively. The results show that smoother and less oxidized coatings were deposited by warm spraying. The microstructure of all coatings underwent an appreciable change during the oxidation tests, as in as-sprayed state it occurred in the nonequilibrium state. It was revealed that a small difference in the initial oxidation between the two spraying processes as well as microstructure, the level of porosity and surface roughness significantly influences the oxidation kinetics of the sprayed coatings at high temperature, which should affect the service lifetime as an oxidation-resistant layer for potential applications. After exposure at 750 _C in air, rutile TiO2 was found in addition to a-Al2O3 in the oxide scale formed on the HVOF and warm sprayed coatings. However, isothermal and cyclic oxidation tests of all WS TiAl-(Cr, Nb, Ta) coatings showed improved oxidation resistance of IMI 834 as well as good adherence to the substrate alloy.
Author Judyta Sienkiewicz
Judyta Sienkiewicz,,
-
, Seiji Kuroda
Seiji Kuroda,,
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, Hideyuki Murakami
Hideyuki Murakami,,
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, Hiroshi Araki
Hiroshi Araki,,
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, Maciej Giżyński
Maciej Giżyński,,
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, Krzysztof Kurzydłowski (FME / DMPE)
Krzysztof Kurzydłowski,,
- Department of Material and Production Engineering
Journal seriesJournal of Thermal Spray Technology, ISSN 1059-9630, e-ISSN 1544-1016, (N/A 140 pkt)
Issue year2019
Vol28
No4
Pages563-579
Publication size in sheets0.8
Keywords in Englishcoatings for engine components, high-temperature oxidation, interlayers, spray forming
ASJC Classification2505 Materials Chemistry; 2508 Surfaces, Coatings and Films; 3104 Condensed Matter Physics
DOIDOI:10.1007/s11666-019-00837-5
Internal identifierROC 19-20
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 12-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.087; WoS Impact Factor: 2018 = 2.129 (2) - 2018=2.074 (5)
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