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Effects of oxide stringers on the β-phase depletion behaviour in thermally sprayed CoNiCrAlY coatings during isothermal oxidation
Journal of Materials Science & Technology ( IF 10.9 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.jmst.2019.11.018
H. Chen , A. Rushworth

This paper details an investigation of the effects of oxide stringers on the β-phase depletion behaviour in thermally sprayed CoNiCrAlY coatings. Vacuum Plasma Sprayed (VPS) CoNiCrAlY coatings, which are free of oxide stringers, are used as the reference materials in comparison with High-Velocity Oxy-Fuel (HVOF) sprayed CoNiCrAlY coatings during isothermal oxidation at 1100 °C. An outer layer of spinel oxides and an inner layer of alumina are formed in the as-sprayed coatings, while only a single alumina scale is found in the heat-treated coatings. Less β-phase depletion occurred in the HVOF coatings than in the VPS coatings. It was found that the β phases tend to coalesce at the oxide stringers in the HVOF coatings, which is likely due to the internal oxide particles and stringers acting as short diffusion barriers to tie up the β phase and inhibit the β-phase depletion.



中文翻译:

等温氧化过程中氧化物纵梁对热喷涂CoNiCrAlY涂层中β相耗竭行为的影响

本文详细研究了氧化物纵梁对热喷涂CoNiCrAlY涂层中β相耗尽行为的影响。与在1100°C等温氧化过程中用高速氧燃料(HVOF)喷涂的CoNiCrAlY涂层相比,无氧化物束的真空等离子喷涂(VPS)CoNiCrAlY涂层被用作参考材料。在喷涂的涂层中形成尖晶石氧化物的外层和氧化铝的内层,而在热处理的涂层中仅发现单个氧化铝鳞。与HVPS涂层相比,HVOF涂层中发生的β相耗损更少。发现在HVOF涂层中,β相趋于在氧化物纵梁上聚结,

更新日期:2020-01-17
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