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研究了高速微粒轰击NiCoCrAlY粘结层后的热障涂层热生长氧化物(TGO)的生长过程。结果表明:等离子喷涂涂层1050℃×72h高温氧化后TGO出现明显分层现象,而经过高速微粒轰击涂层1050℃×96h高温氧化后TGO形貌更为平坦且无分层现象发生。此外,NiCoCrAlY粘结层经高速微粒轰击后产生大量的位错网;TGO进入稳态氧化阶段时间缩短,稳态氧化阶段时间延长。涂层抗高温氧化性能明显提高。
The growth process of thermal barrier oxide (TGO) after high-speed particle bombardment of NiCoCrAlY bonding layer was studied. The results show that the TGO of the plasma sprayed coating is obviously delaminated at high temperature of 1050 ℃ × 72h, and the morphology of TGO is flatter and delaminated after high temperature microparticle coating at 1050 ℃ for 96h. In addition, the NiCoCrAlY bonding layer produced a large number of dislocation networks after high-speed particle bombardment; the TGO enters the steady-state oxidation stage and the steady-state oxidation stage prolongs. Coating high temperature oxidation performance was significantly improved.