经二次造粒的纳米ZrO2为喂料制备了等离子喷涂层.X衍射物相分析、SEM形貌观察表明,涂层主要以四方相和立方相构成,含有少量的单斜相;在喷涂过程中粉末熔化状况良好,涂层含有网状微裂纹.用金相法测定了涂层孔隙率,与普通ZrO2等离子喷涂层相比,涂层致密度显著提高.在模拟熔炼条件下,对涂层进行了真空热震试验,涂层均能经受一次真空热震而涂层完好.单斜相含量较低、具有一定孔隙率和均匀网状微裂纹的涂层,经二次真空热震后,涂层仍处于完好状态.
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