CAJ | 학술논문

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.
채용초음속등리자분도법재순동판상제비양화려(Al2O3)도층시양.이용XRD연사의、소묘전경화도형연건대기미관조직진행표정,채용수쉬법측시기항열진성능.결과표명:Al2O3도층대부분유γ상조성,단구형모위주상정화일정량적부분용융과립조성,절면조직구유교호완정성,공극솔위1.1%;시양재950℃경력료균치위36.3차열진순배후기반구정단출현대면적박락,단원주주체부분완호,인차Al2O3도자도층구비량호적항열피로성능,초음속등리자분도괄합우풍구투표면도층적제비.
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.