Influence of heat exposure time on isothermal degradation of plasma sprayed CoNiCrAlY coatings
Influence of heat exposure time on isothermal degradation of plasma sprayed CoNiCrAlY coatings
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DOI：
10.1016/j.surfcoat.2007.03.040
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发表时间：
2007-06
影响因子：
5.4
通讯作者：
D. Seo;K. Ogawa;M. Tanno;T. Shoji;S. Murata
中科院分区：
文献类型：
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作者：
D. Seo;K. Ogawa;M. Tanno;T. Shoji;S. Murata
在这项工作中，研究了所选 CoNiCrAlY 涂层的热降解行为。重点放在氧含量、孔隙率、表面粗糙度和氧化行为的变化上。结果表明，涂层的等温降解受热暴露时间和粉末颗粒分布的影响很大。在热暴露的初始阶段，氧含量、表面粗糙度和 TGO 尺度的值急剧收敛到稳定的极值。粒径对喷涂涂层中的氧含量有影响。受热后，使用较小和较大颗粒沉积的涂层上的氧含量差异减小。横截面孔隙率在IP阶段下降，在IIP阶段增加，然后再次下降。这些可能是由于 Stage IP 的烧结效应造成的。直到IR阶段，表面粗糙度下降，但在IR阶段，表面粗糙度保持在相对固定的值或略有增加。 TGO厚度增长率和抛物线氧化速率常数受涂层表面粗糙度的影响。
In this work, the thermal degradation behavior of selected CoNiCrAlY coatings has been studied. Emphasis was placed upon the change of oxygen content, porosity, surface roughness, and oxidation behavior. The results show that the isothermal degradation of coatings was considerably influenced by the heat exposure time and powder particle distribution. The values of oxygen content, surface roughness, and TGO scales converge sharply into the stable extremes at the initial stage of heat exposure. The particle size has an effect on the oxygen content in as-sprayed coatings. After heat exposure, the difference of the oxygen content on coating deposited using between the smaller and larger particle was decreased. The cross-sectional porosity decreased at Stage IP, increased at Stage IIP, and then decreased again. These could be due to the sintering effect at Stage IP. The surface roughness decreased up to Stage IR, but over Stage IR, surface roughness was kept in relatively fixed value or increased slightly. The TGO thickness growth rate and parabolic oxidation rate constant are influenced by the surface roughness of coatings.