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首页> 外文会议>2nd International Conference on Energy and the Future of Heat Threatment and Surface Engineering >Effects of vacuum pre-oxidation process on the thermally grown oxides layer of CoCrAlY high temperature corrosion resistance coating
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Effects of vacuum pre-oxidation process on the thermally grown oxides layer of CoCrAlY high temperature corrosion resistance coating

机译：真空预氧化工艺对CoCrAlY高温耐腐蚀涂层热生长氧化物层的影响

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Thermal barrier coatings (TBCs) are widely applied for the cutting-edge fields such as aerospace, weapons and ships.The high temperature lifespan of Electron Beam Physical Vapor Deposition (EB-PVD) is much longer than that of thermal spraying whose lifetime of high temperature oxidation will be increased when adding the specific process of vacuum pre-oxidation before high temperature service.This paper explores the influence of vacuum pre-oxidation process on the phase transformation of thermally grown oxides (TGO) of the CoCrAlY high temperature corrosion resistance coatings produced by means of High Velocity Oxygen Fuel (HVOF) on the nickel-based superalloy substrate.And this study indicates that those coatings without vacuum pre-oxidation process that are subjected to the initial high temperature oxidation, for TGO contains a lot of chromium oxides, cobalt oxides and spinel oxides in addition to alumina.Furthermore,the quantity of the formation of alumina is strongly dependent on the partial pressure of oxygen;while the CoCr2O4 spinel oxides can be formed in the conditions of both high partial pressure of oxygen at the initial isothermal oxidation and the chemical reaction at the subsequent stage of isothermal oxidation.After the appropriate vacuum pre-oxidation process, the main phases in the TGO are Al2O3 with lower Y elements distributing sporadically the Al2O3 with higher Y elements, and the grain sizes of the alumina are ranged from 0.4 μm to 1 μm, and the spinel oxides cannot be found in the TGO.After isothermal oxidation for 100 hours, the grain size of the alumina reaches to 1 μm approximately, a small amount of CoCr2O4 with the porous microstructure and Cr2O3 distribute sporadically in the adjacent of the continuous alumina.Additionally, the growth rate of TGO becomes lower than those without vacuum pre-oxidation process.
机译：热障涂层（TBC）广泛应用于航空航天，武器和舰船等前沿领域，电子束物理气相沉积（EB-PVD）的高温寿命比热喷涂的高温寿命长得多在高温服役前添加真空预氧化的特定工艺会增加温度的氧化。本文探讨了真空预氧化工艺对CoCrAlY耐高温腐蚀涂层的热生长氧化物（TGO）的相变的影响。这项研究表明，在未进行真空预氧化的情况下，那些经过初始高温氧化处理的涂层，由于TGO中含有大量的铬氧化物，因此需要在镍基高温合金基底上通过高速氧气燃料（HVOF）进行生产。除氧化铝以外，还包括氧化钴和尖晶石氧化物。此外，氧化铝的形成量强烈依赖于氧分压;而CoCr2O4尖晶石氧化物可以在初始等温氧化的高氧分压和随后等温氧化的化学反应的条件下形成，经过适当的真空预氧化工艺后， TGO中的主要相为Y元素含量较低的Al2O3零星分布，Y元素含量较高的Al2O3，氧化铝的晶粒尺寸在0.4μm至1μm之间，并且在TGO中找不到尖晶石氧化物。氧化100小时后，氧化铝的晶粒尺寸达到约1μm，少量具有多孔微结构的CoCr2O4和Cr2O3零星地分布在连续的氧化铝的相邻区域中。真空预氧化过程。

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