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超音速微粒轰击处理对NiCoCrAlY粘结层高温氧化行为的影响

, PP. 214-218

Keywords: 超音速微粒轰击技术,粘结层,高温氧化,亚稳态,尖晶石,热障涂层

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Abstract:

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2h,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.

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