Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 748, Issue -, Pages 230-235Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.03.172
Keywords
Plasma spraying; Composite coating; Nanostructured coating; Eutectic coating; Al-Cr2O3 thermite reaction
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Funding
- National Natural Science Foundation of China [51672067, 51541208, 51102074]
- Natural Science Foundation of Hebei Province [E2018202034, E2015202070]
- Foundation for talent training project in Hebei Province [A2016002026]
- Foundation for the top talents in Universities in Hebei Province [SLRC2017027]
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According to the characteristic of eutectic solidification, the [Cr+(Cr,Al)(2)O-3] eutectic nanocomposite coating was in-situ synthesized by reactive plasma spraying Al-Cr2O3-Al2O3 powder. The microstructure of the [Cr+(Cr,Al)(2)O-3] coating shows the characteristic of nanostructure, in which Cr with granular and rod shape distributed homogeneously in (Cr,Al)(2)O-3 matrix. The particle size of Cr was less than 10 nm, and the diameter of Cr with rod shape was less than 20 nm and the length of the rod was less than 100 nm. The microhardness of the [Cr+(Cr,Al)(2)O-3] eutectic nanocomposite coating and the (Cr,Al)(2)O-3 coating were HV0.3 1764 and HV0.3 1129, respectively. The toughness of the eutectic nanocomposite coating was higher than that of the (Cr+(Cr,Al)(2)O-3 coating. The wear resistance of the eutectic nanocomposite coating was 5.57 times of the (Cr,Al)(2)O-3 coating. (C) 2018 Elsevier B.V. All rights reserved.
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