Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings
Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings
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DOI：
10.1179/0960340914z.000000000103
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发表时间：
2015-01
影响因子：
1.3
通讯作者：
H. Chen;D. McCartney;K. Voisey
中科院分区：
文献类型：
--
作者：
H. Chen;D. McCartney;K. Voisey
本文研究了高速氧喷涂MCrAlY涂层的等温氧化行为。IN738和CMSX4基片上的独立涂层和涂层在1100℃恒温氧化长达100h，研究了表面条件(喷涂和抛光)的影响。用扫描电子显微镜和能量色散X射线分析表征了氧化行为的细节。结果表明，表面条件和衬底类型都对氧化行为有显著影响。在Inconel 738上观察到抛光涂层的大量内氧化和氮化，这可以归因于钛从基材扩散和抛光增强表面扩散的综合作用。
Abstract This study deals with the isothermal oxidation behaviour of high velocity oxy-fuel sprayed MCrAlY coatings. Both free-standing coatings and coatings attached to IN738 and CMSX4 substrates underwent isothermal oxidation at 1100°C for up to 100 h. The effect of surface conditions (as sprayed and polished) has been investigated. Scanning electron microscopy and energy dispersive X-ray analysis were used to characterise the details of oxidation behaviour. The results have shown that both surface conditions and substrate type have a pronounced effect on oxidation behaviour. Extensive internal oxidation and nitridation was observed for polished coatings on Inconel 738 and can be attributed to the combined effects of titanium diffusion from the substrate and enhanced surface diffusion due to polishing.