大气中熔融Zn/Al_2O_3陶瓷涂层界面反应机理分析  

Mechanism of interface reaction between molten Zn and Al_2O_3 ceramic coating in air

作　　者：王赫莹[1] 李德元[2] 孙学雁[1] 曹辉[1] 

机构地区：[1]沈阳工业大学机械工程学院,沈阳110870 [2]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2010年第3期285-289,共5页Journal of Shenyang University of Technology

基　　金：辽宁省教育厅基金资助项目(990521043)

摘　　要：为了分析熔融Zn/Al2O3陶瓷涂层界面反应产物及其反应机理,在大气气氛中测定了熔融Zn/Al2O3陶瓷涂层的润湿角.通过扫描电镜(SEM)、x-射线衍射仪(XRD)、能谱仪(EDS)等手段,分析了润湿表面及断面组织形貌、润湿后Al2O3陶瓷涂层表面相结构及其微区成分.结果表明:熔融Zn/Al2O3陶瓷涂层的润湿角较大,约为138°,随着润湿时间的延长,润湿角减小到约131°,并基本保持不变;熔融Zn/Al2O3陶瓷涂层在润湿过程中,界面处产生了物质迁移和成分变化,生成3ZnO-47Al2O3、4ZnO-11Al2O3和ZnO-Al2O3等类似尖晶石结构的锌铝化合物.这表明熔融Zn/Al2O3陶瓷涂层间发生了反应性润湿.In order to determine both product and mechanism of interface reaction between molten Zn and Al2O3 ceramic coating, the wetting angle of molten Zn/Al2O3 ceramic coatings in air was measured. The morphology of the wetting surface and cross-section as well as the surface phase structure and micro-area composition of Al2O3 ceramic coating after wetting were analyzed by means of scanning （SEM）, x-ray diffractometer （XRD） and energy disperse spectroscopy （EDS）. The results show that the wetting angle of molten Zn/A1203 ceramic coatings is larger and approximately 138~. However, the wetting angle reduces to about 131° and then basically keeps constant with increasing the wetting time. In the wetting process of the molten ZR/Al2O3 ceramic coating, the mass migration and composition change happen, and such zinc-aluminum compounds with spinel-like structure as 3ZnO-47Al2O3,4ZnO-11Al2O3 and ZnO-Al2O3 generate. It indicates that the reactive wetting occurs at the interface between molten Zn and Al2O3 ceramic coating.

关 键 词：熔融Zn AL2O3陶瓷涂层 润湿角 界面反应 组织形貌 相结构 润湿性 机理 

分 类 号：TB332[一般工业技术—材料科学与工程]