【摘要】 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.更多还原

【Abstract】 γ′-Ni₃Al andγ-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 phaseγ-Al₂O₃ and stable phaseα-Al₂O₃.There existed a small amount of NiO,Co₃O₄ and spinel phases between Al₂O₃ grains observed by SEM.While the surface of phaseγ-Ni was inclined to form stable phaseα-Al₂O₃,and the surface of phaseβ-（Ni,Co）Al and phaseγ′-Ni₃Al was apt to be the nucleation site of metastable phaseγ-Al₂O₃ and spinel phase.Therefore,the main phaseα-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.更多还原