阴极等离子体电沉积Pt颗粒弥散的Al2O3/YSZ复合涂层的性能研究

Characteristics of Al2O3-Pt/YSZ-Pt double layer composite coatings prepared by cathode plasma electrolytic depositionShunjie Denga, Chi Jiangb, Tianwei Liub, Maobing Shuaia*, Peng Wangc

摘要:

采用阴极等离子电解沉积弥散Pt颗粒增韧YSZ-Pt/Al2O3-Pt双层复合涂层。涂层中弥散的Pt颗粒阻碍的氧在涂层中的扩散，提高了涂层的抗氧化性能。Pt颗粒的弥散增韧显著提高了涂层的断裂韧性，缓解了陶瓷层与合金基体在高温下产生的热应力，使得涂层在高温服役过程中具有良好的抗剥落性能。

Abstract:

In this study, Al₂O₃-Pt/YSZ-Pt double layer composite coatings were prepared by cathode plasma electrolytic deposition (CPED) on the high-temperature alloy with a NiCoCrAlY bond-coat. The composite coatings were consisted of a Al₂O₃-Pt film and a YSZ-Pt top-coat, and showed a good adhesion with the metallic bond-coat. It is demonstrated, from the cyclic oxidation test and mechanical properties test, that such coatings possess good oxidation and spallation resistances. These beneficial results can be attributed to the effects: such coatings can inhibit further oxidation of the bond-coat owing to the extremely low oxygen diffusion rate of Al₂O₃-Pt film; the mechanical properties of Al₂O₃-Pt/YSZ-Pt composite coating are improved by the toughening effects of Pt particles.