等离子喷涂高炉风口用Al_2O_3涂层的组织及性能研究  

Microstructure and property of Al_2O_3 coating for tuyere in blast furnace deposited by plasma spraying

作　　者：刘乃杰[1] 张建 贾元毅[1] 杨军[3] 王静[3] 

机构地区：[1]济南钢铁股份有限公司,山东济南250101 [2]首钢京唐钢铁联合有限责任公司炼铁作业部炼铁分厂,河北唐山063200 [3]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《兵器材料科学与工程》2013年第2期109-112,共4页Ordnance Material Science and Engineering

摘　　要：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。A12O3-Ni-5A1 coatings were deposited onto pure copper substrate by high efficiency supersonic atmosphere plasma spray （SAPS）. The A1203 coating was characterized by XRD, SEM, and image software （Image-pro Plus）. The thermal shock resistance of A1203 coating was investigated through water quenching from 950 ℃ to room temperature. The results indicate that γ- A1203 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.

关 键 词：超音速等离子喷涂 风口 AL2O3涂层 微观组织 结合强度 抗热震性能 

分 类 号：TB321[一般工业技术—材料科学与工程]