王萍,张春青,马群

• 1:西安工业大学材料与化工学院
• 2:承德石油高等专科学校机械系
• 3:西安工业大学兵研院

摘要(Abstract)：

采用ZrO_2溶胶改性的等离子体电解氧化(PEO)技术在Al-12.5%Si合金表面制备Al_2O_3-ZrO_2陶瓷层,研究ZrO_2溶胶对PEO陶瓷层形成机制的影响。采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、红外光谱仪(FTIR)和激光粒度仪等研究了ZrO_2溶胶的微观组织结构、粒径及荷电性以及陶瓷层的微观形貌、成分及物相。结果表明:荷负电的ZrO_2溶胶粒径为50～60 nm,烧结后以四方相t-ZrO_2存在,含有少量m-ZrO_2。ZrO_2溶胶改性的PEO涂层较未改性的涂层均匀、致密,并且生长速率提高。由于ZrO_2溶胶吸附在基体表面形成凝胶层,凝胶层的高电阻使PEO初期更易产生火花放电,促进了Al_2O_3膜的形成。ZrO_2溶胶改性的PEO涂层由Al_2O_3、c-ZrO_2、t-ZrO_2和少量的SiO_2组成,而溶胶改性前SiO_2的含量较高。ZrO_2凝胶颗粒在等离子体放电产生的高温下进入放电通道,与电化学反应形成的Al_2O_3烧结形成Al_2O_3-ZrO_2复合陶瓷层。

关键词(KeyWords)： Al-12.5%Si合金;等离子体电解氧化;ZrO_2溶胶;生长机制模型

Abstract:

Keywords:

基金项目(Foundation): 陕西高校“金属腐蚀防护与表面工程技术”青年创新团队;; 陕西省重点研发计划(2018GY-111);; 陕西省教育厅产业化培育项目(17JF009);; 榆林科技计划项目(2018-2-30)

作者(Author): 王萍,张春青,马群

DOI: 10.13289/j.issn.1009-6264.2019-0408

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