Abstract A high performance NiCoCrAlY bond coat with dense dendritic microstructure was fabricated using laser powder deposition (LPD) technique. The thermally grown oxides (TGO) formed on the coating deposited by laser powder deposition is predominantly alumina instead of the mix oxides usually formed on the coatings prepared by air plasma spray and high velocity air fuel. Isothermal oxidation tests performed at 1150 °C reveal that the LPD bond coat shows significantly better spallation resistance and lower TGO growth rate. The superior spallation resistance of the TGO is further discussed in relation to the unique microstructure of the LPD bond coat.

中文翻译：

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使用激光粉末沉积制造的高性能 NiCoCrAlY 粘合涂层

摘要 采用激光粉末沉积（LPD）技术制备了具有致密树枝状微观结构的高性能NiCoCrAlY粘结涂层。在通过激光粉末沉积沉积的涂层上形成的热生长氧化物 (TGO) 主要是氧化铝，而不是通常在通过空气等离子喷涂和高速空气燃料制备的涂层上形成的混合氧化物。在 1150 °C 下进行的等温氧化测试表明，LPD 粘合涂层显示出明显更好的抗散裂性和更低的 TGO 生长速率。关于 LPD 粘合涂层的独特微观结构，进一步讨论了 TGO 的优异抗剥落性。