采用超音速微粒轰击(SFPB)技术细化处理高速氧燃料喷涂法(HVOF)喷涂的粘结层, 结果表明粘结层主要由γ'-Ni3Al相和γ-Ni相组成. 高温氧化2 h,粘结层表面首先生成亚稳态的γ-Al2O3和稳态的 α-Al2O3,且在Al2O3之间有少量NiO、Co3O4和尖晶石. 亚稳γ-Al2O3和尖晶石倾向于借助β-(Ni,Co)Al相或γ'-Ni3Al相晶体表面形核长大; 稳定的α-Al2O3倾向于借助γ-Ni相晶体表面形核长大. 较长时间的高温氧化后,形成了以α-Al2O3为主相的热生长氧化物层(TGO), 对热障涂层系统的高温腐蚀具有良好的防护作用.
γ'-Ni3Al and γ-Ni phases were detected in a NiCoCrAlY bond coat after HVOF (high velocity oxyfuel spraying)+SFPB (supersonic fine particles bombarding) processes. After 2 h isothermal oxidation, the oxide scale on the surface of bond coat mainly consisted of metastable phase γ-Al2O3 and stable phase α-Al2O3. There existed a small amount of NiO, Co3O4 and spinel phases between Al2O3 grains observed by SEM. While the surface of phase γ-Ni was inclined to form stable phase α-Al2O3 , and the surface of phase β-(Ni,Co)Al and phase γ'-Ni3Al was apt to be the nucleation site of metastable phase γ-Al2O3 and spinel phase. Therefore, the main phase α-Al2O3 formed in the TGO after relatively long time isothermal oxidation, which may be beneficial to thermal barrier coating system in high temperature corrosion resistance.
参考文献
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