采用改进的等离子体电解氧化(PEO)技术在锆盐体系和锆盐-钇盐体系电解液中制备ZAlSil2Cu3Ni2合金表面ZrO2-Al2O3陶瓷层和Y2O3-ZrO2-Al2O3陶瓷层,研究电解液中稀土钇盐Y(NO3)3对PEO陶瓷层组织和耐高温性能的影响.通过SEM、XRD等分析方法对陶瓷层的组织结构及相组成进行了分析,并对陶瓷层的隔热性能及高温稳定性进行了测试.结果表明,与ZrO2-Al2O3陶瓷层相比,Y2O3-ZrO2-Al2O3陶瓷层表面由细小颗粒组成,涂层均匀、致密;锆钇盐体系陶瓷层形成了钇部分稳定锆的固溶体(Y2O3和Y0.15Zro.85O1.93口0.07),并提高了反应温度;Y2O3-ZrO2-Al2O3陶瓷层生长速度大于ZrO2-Al2O3陶瓷层,其中向外生长厚度明显增大;另外,隔热性能得到提高.Y2O3-ZrO2-Al2O3陶瓷层试样经400℃高温氧化处理,其氧化增重曲线呈对数规律,氧化增重量小,表明高温稳定性良好.
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