采用超音速等离子喷涂法在纯铜板上制备氧化铝(Al2O3)涂层试样.利用XRD衍射仪、扫描电镜和图形软件对其微观组织进行表征,采用水淬法测试其抗热震性能.结果表明:Al2O3涂层大部分由γ相组成,断口形貌为柱状晶和一定量的部分熔融颗粒组成,截面组织具有较好完整性,孔隙率为1.1%;试样在950℃经历了均值为36.3次热震循环后其半球顶端出现大面积剥落,但圆柱主体部分完好,因此Al2O3陶瓷涂层具备良好的抗热疲劳性能,超音速等离子喷涂适合于风口套表面涂层的制备.
Al2O3?Ni?5Al coatings were deposited onto pure copper substrate by high efficiency supersonic atmosphere plasma spray(SAPS). The Al2O3 coating was characterized by XRD,SEM,and image software(Image?pro Plus). The thermal shock resistance of Al2O3 coating was investigated through water quenching from 950℃to room temperature. The results indicate thatγ?Al2O3 is the main phase identified after spraying and the fracture microstructure is composed of columnar crystals together with a small amount of partially melted particles. The cross?sectional morphology exhibits fairly good integrity and its porosity is 1.1%. The hemispherical dome of the samples spalls with the greater surface area after the average thermal shock cycles of 36.3,and the main part of cylindrical samples is intact,exhibiting a superior thermal shock resistance. The supersonic atmosphere plasma spraying method is suitable for the preparation of coating for tuyere with extreme temperature variations.
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