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[Zhang Zhen,Qian Weifeng,Li Jing,Chen Yongnan,Hao Jianmin,Chen Hong,Zhao Qinyang,Li Hongzhan and Zhao Yongqing.In-situ synthesis of ZrO2/MgO coating and self-repairing cracks[J].Rare Metal Materials and Engineering,2022,51(8):2979~2984.]
In-situ synthesis of ZrO2/MgO coating and self-repairing cracks
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Received:July 14, 2021  Revised:September 01, 2021
DOI:
Key words: Magnesium alloy  Micro-arc oxidation  self-repairing  In-situ ZrO2  Wear properties
Foundation item:陕西省科技重大专项(项目号2020zdzx04-03-02),陕西省重点研发计划(项目号2020GY-249,2020ZDLGY12-09),陕西省陕煤联合(2019JLM-47),西安市未央区科技计划 (202007),西安市科技计划项目 (2020KJRC0128),中央高校基本科研业务费专项资金 (300102319304, 300102310107)
Author NameAffiliation
Zhang Zhen,Qian Weifeng,Li Jing,Chen Yongnan,Hao Jianmin,Chen Hong,Zhao Qinyang,Li Hongzhan and Zhao Yongqing  
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Abstract:
      The cracks will impact the toughness and wear properties in the coating formation process of micro-arc oxidation melting and cooling. This paper uses the ZrO2 strength and toughness to prepare ZrO2/MgO coating with self-repairing cracks, and investigates the effect of in-situ ZrO2 on the wear properties of the coating. The research found that the in-situ synthesis ZrO2 by micro-arc oxidation undergoes phase transition in the high-temperature discharge channel to generate volume expansion and micro-cracks initiation at the interface of zirconia, which inhibits the crack propagation during the coating formation process and realizes the role of self-repairing coating cracks.The ZrO2 content in the coating can be regulated by controlling the content of the zirconium source, the in-situ ZrO2 content in the coating is 32%, the cracks of the ZrO2/MgO coating are finely dispersed, and the crack density is 63.4% lower than that of the traditional coating, the friction coefficient is reduced by 53.4%, the amount of wear descended by 66.7%. Research thinks, the in-situ synthesized ZrO2 self-repairing cracks and improvement of wear resistance during the coating preparation process, which can reduce the friction coefficient and mass loss, and improve the surface wear properties of the ZrO2/MgO coating.