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等离子喷涂制备TiC+(Al2O3/TiC)+Al2O3自愈合涂层

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Abstract:

采用大气等离子喷涂方法在马氏体钢基体上制备TiC+(Al2O3/TiC)+Al2O3复合涂层。对涂层的抗热冲击性能、热氧化处理前后截面形貌及成分进行了分析,利用电化学方法测量涂层的耐腐蚀性能。结果表明,这种复合涂层在高温下具有良好的自愈合能力及抗热冲击性能,涂层样品在800、700、600℃和500℃下的抗热冲击次数分别达到了157、125、95次和83次;在600℃经过30h热氧化处理之后,涂层的耐腐蚀性能提高了近1个数量级,孔隙率下降了90%以上。能谱分析表明,涂层中TiC在高温下的氧化产物填充并愈合了涂层中的裂纹与孔隙,起到了自愈合的作用。

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