Influence of Micro-Arc Oxidation Time on Structure and Properties of MAO/Cr Composite Coatings
Received date: 2022-10-12
Revised date: 2023-03-05
Online published: 2023-03-10
Supported by
CAS Interdisciplinary Innovation Team(292020000008)
Since the 2011 Fukushima nuclear accident, much attention has been given to accident-tolerant fuel cladding coating. In this study, micro-arc oxidation (MAO) and high-power pulsed magnetron sputtering were employed to deposit MAO/Cr composite coatings on the surface of Zirlo alloy. The effects of micro-arc oxidation time on the microstructure, mechanical properties, and high-temperature steam oxidation resistance of MAO/Cr composite coatings were investigated. Results showed that when the micro-arc oxidation time was enhanced from 3 min to 9 min, the (200)-plan texture coefficient increased from 83% to 100%. Moreover, with the increase in micro-arc oxidation time, the composite coating fracture toughness first increased, and then decreased after reaching a peak of 4.64 MPa⋅m1/2 in 6 min. After steam oxidation at 900°C for 1 h, the composite coating systems showed delamination. Among them, MAO3min/Cr and MAO6min/Cr coatings gained less weight, whereas MAO9min/Cr coating gained more weight and formed a large number of microcracks on its surface cross-section. It can be observed that the obtained composite coating with a 6-min micro-arc oxidation has both excellent mechanical properties and outstanding resistance to high-temperature steam oxidation.
WANG Zheng , WANG Zhenyu , WANG Aiying , YANG Wei , KE Peiling . Influence of Micro-Arc Oxidation Time on Structure and Properties of MAO/Cr Composite Coatings[J]. Acta Metall Sin, 2024 , 60(5) : 691 -698 . DOI: 10.11900/0412.1961.2022.00510
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