原位合成ZrO_(2)/MgO膜层及自修复裂纹研究  

In-situ Synthesis of ZrO_(2)/MgO Coating and Self-Repairing Cracks

作　　者：张震 钱伟峰 李景 陈永楠[1] 郝建民[1] 陈宏[1] 赵秦阳 李宏战[2] 赵永庆[2] Zhang Zhen;Qian Weifeng;Li Jing;Chen Yongnan;Hao Jianmin;Chen Hong;Zhao Qinyang;Li Hongzhan;Zhao Yongqing(School of Materials Science and Engineering,Chang’an University,Xi’an 710064,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2022年第8期2979-2984,共6页Rare Metal Materials and Engineering

基　　金：陕西省科技重大专项(2020zdzx04-03-02);陕西省重点研发计划(2020GY-249,2020ZDLGY12-09);陕西省陕煤联合基金(2019JLM-47);西安市未央区科技计划(202007);西安市科技计划(2020KJRC0128);中央高校基本科研业务费专项资金(300102319304,300102310107)。

摘　　要：微弧氧化熔融冷却成膜过程出现的裂纹将影响膜层的强韧性和磨损性能。本研究利用ZrO_(2)自身的强韧性,原位合成具有自修复裂纹作用的ZrO_(2)/MgO膜层,研究原位合成的ZrO_(2)对膜层磨损性能的影响。结果表明,微弧氧化原位合成的ZrO_(2)在高温放电通道发生相变产生体积膨胀使得氧化锆界面萌生微裂纹并阻碍裂纹尖端的裂纹扩展,从而实现了膜层裂纹的自修复。通过控制锆源含量实现了对膜层中ZrO_(2)含量的调控,膜层中原位ZrO_(2)含量为32%时,ZrO_(2)/MgO膜层裂纹呈现细小分散化,裂纹密度较传统膜层下降63.4%,摩擦系数减小53.4%,磨损量降低66.7%。研究认为,原位合成的ZrO_(2)在膜层制备过程实现裂纹自修复并有效降低摩擦系数和磨损量,改善ZrO_(2)/MgO膜层表面磨损性能。The cracks will impact the toughness and wear properties in the coating formation process of micro-arc oxidation melting and cooling.This research used the ZrO_(2) to synthesize a ZrO_(2)/MgO coating with self-repairing cracks,and investigated the effect of in-situ ZrO_(2) on the wear properties of the coating.It is found that the in-situ synthesized ZrO_(2) by micro-arc oxidation undergoes phase change in the high-temperature discharge channel to generate volume expansion,which causes microcracks in the zirconia interface and hinders the crack propagation at the crack tip,so as to realize the self-repairing coating crack.The ZrO_(2) content in the coating is controlled by controlling the content of zirconium source.When the in-situ ZrO_(2) content in the coating is 32%,the cracks of the ZrO_(2)/MgO coating are finely dispersed,and the crack density is 63.4%lower than that of the traditional coating,the friction coefficient is redu ced by 53.4%,the amount of wear is descended by 66.7%.It is believed that the in-situ synthesized ZrO_(2) realizes self-repairing of cracks during the coating preparation process,which can effectively reduce the friction coefficient and wear amount,and improve the surface wear properties of the ZrO_(2)/MgO coating.

关 键 词：镁合金 微弧氧化 自修复 原位ZrO_(2) 磨损性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]