NDLI: Effect of Heat Treatment on the Microstructure and Microhardness of Nanostructural Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Kovaleva, M. Tyurin, Yu. Vasilik, N. Kolisnichenko, O. Prozorova, M. Arseenko, M. Sirota, V. Pavlenko, I.
Copyright Year	2014
Abstract	Nanostructural Al$_{2}$O$_{3}$ coatings were formed on a steel substrate surface using a multichamber detonation sprayer. The Al$_{2}$O$_{3}$ coatings were characterized by a dense microstructure with porosity below 1% and hardness of 1300 ± 25 HV$_{0.3}$. The transition layer between the coating and substrate was up to 15 μm thick, containing Fe-Al-type intermetallic compounds (FeAl$_{3}$, Fe$_{2}$Al$_{5}$). Postdeposition heat treatment of the samples at 850 °C for 3 h was carried out in air and argon environments. The effect of heat treatment on the microstructure and microhardness of the Al$_{2}$O$_{3}$ coatings was investigated by optical microscopy, scanning and transmission electron microscopy, scanning probe microscopy, x-ray phase analysis, and Vickers hardness testing. A positive impact of postcoating heat treatment on the coating microstructure and microhardness was observed. Heat treatment resulted in an increase in the coating hardness from 1300, to 1350 ± 25 HV$_{0.3}$ and 1600 ± 25 HV$_{0.3}$ after annealing in air and argon, respectively. Heat treatment in argon led to a more significant increase in the α-Al$_{2}$O$_{3}$ phase from 47 to 81%.
Starting Page	1199
Ending Page	1209
Page Count	11
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	23
Issue Number	7
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2014-07-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Al$_{2}$O$_{3}$ coating heat treatment microstructure microhardness multichamber detonation sprayer porosity Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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