摘要
以Zn和Al粉末为原料(Zn质量分数为85%),采用冷气动力喷涂方法制备65%Zn-Al涂层。采用SEM和光学显微镜(OM)对涂层的显微组织进行研究,结合XRD和X射线能谱(EDS)对涂层的沉积特性进行分析。结果表明:在本实验条件下可获得厚度为0.7mm、孔隙率为1.7%的65%Zn-Al复合涂层;Al粒子的沉积效率要远高于Zn粒子的;Zn和Al粒子主要通过塑性变形机械咬合在一起,粒子间结合紧密;交界面处粒子由于连续冲击作用产生破碎细化;涂层显微硬度高于Zn和Al块材的,涂层的本身强度大于其与基体的结合强度,部分结合面涂层与基体存在元素扩散的现象,组织中未检测到固溶体与化合物相。
With Zn and Al mixed powders as raw materials, 65%Zn-Al coatings were prepared by cold gas dynamic spray. The microstructures of the cold-sprayed 65%Zn-Al coatings were characterized by SEM and OM. XRD and EDS were used to analyze the co-deposited characteristics of 65%Zn-Al coatings. The results reveal that a densely co-deposited 65%Zn-Al coating with thickness of about 0.7 mm and porosity of 1.7% is obtained. The deposition efficiency of Al particles on the co-deposited coating is obviously higher than that of Zn particles. The bonding among Zn and Al particles mainly attributes to the plastic deformed mechanical embedding effect, and the combination among particles is tight. Those particles at the interface are broken and fined by continuous collision, so they have relative higher micro hardness than Zn or Al bulk metal. The bonding among the particles in the coating is more strength than the bonding of coating to substrate. There is element diffusion phenomenon in the interface between the coating and the substrate, and no solid solution and compound is observed.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2010年第7期1353-1359,共7页
The Chinese Journal of Nonferrous Metals
基金
国防重点实验室基金资助项目(9140C2505010605)
