Thermal barrier coatings (TBCs) are essential for protecting the high-temperature components in gas turbines. However, the durability of TBCs is limited, and new technologies to improve their lifetime are necessary. This study focuses on the pre-oxidation treatment of the NiCoCrAlY bond coat in TBCs to reduce the growth rate of the thermally grown oxide (TGO) and improve the TBC lifetime. The mechanism of the TGO growth rate reduction by the pre-oxidation treatment of NiCoCrAlY was investigated. Oxidation behaviors of the surface of NiCoCrAlY coating samples with or without pre-oxidation treatment were evaluated in air at 800 °C and 900 °C. In-situ X-ray diffraction (XRD) measurements and isothermal oxidation tests were performed. The obtained results revealed that the growth rate of TGO is significantly suppressed by α-Al₂O₃ layer formed by the pre-oxidation treatment. The generation of γ-Al₂O₃ and θ-Al₂O₃, which are typically formed below 900 °C, was significantly reduced by pre-oxidation. It is suggested that this reduction suppresses of the TGO growth.

热障涂层 (TBC) 对于保护燃气轮机的高温部件至关重要。然而，TBC 的耐用性是有限的，需要采用新技术来提高其使用寿命。本研究重点关注 TBC 中 NiCoCrAlY 粘结层的预氧化处理，以降低热生长氧化物 (TGO) 的生长速率并提高 TBC 寿命。研究了NiCoCrAlY预氧化处理降低TGO生长速率的机制。在800℃和900℃空气中评估了经过或未经预氧化处理的NiCoCrAlY涂层样品的表面氧化行为。进行了原位 X 射线衍射 (XRD) 测量和等温氧化测试。所得结果表明，预氧化处理形成的α -Al ₂ O ₃层显着抑制了TGO的生长速率。通常在900℃以下形成的γ -Al ₂ O ₃和θ -Al ₂ O ₃的生成通过预氧化显着减少。这表明这种减少抑制了 TGO 的生长。