摘要
用高速火焰喷涂方法制备出Fe-25Al/11SiC复合涂层,对涂层的结合强度、抗热震性及温度为650℃时的热腐蚀行为进行研究,并利用扫描电镜和X射线衍射仪(XRD)对腐蚀前后涂层的表面形貌和相组成进行分析。结果表明:Fe-25Al/11SiC复合涂层组织致密,与基体结合状况良好,且以机械结合为主;该涂层具有较好的抗热震性能;经过150h热腐蚀后,Fe-25Al/11SiC复合涂层腐蚀增重约为基体20钢的1/3,抗热腐蚀性能优异;Fe-25Al/11SiC复合涂层发生的是第二类低温热腐蚀。
Fe-25Al/11SiC composite coating was made by HVFS(high velocity flame spraying).The bonding strength,anti-thermal shaking and hot corrosive property of the coating were tested.The surface appearances and phase compositions before and after corrosion were analyzed by SEM and XRD.The testing results showed that Fe-25Al/11SiC composite coating has high density and is well bonded to the base metal.The mechanism of bonding is mainly mechanical bonding.The coating has good anti-thermal shaking property.After 150 h,the corrosion increase of Fe-25Al/11SiC composite coating was about 1/3 that of 20 steel under same condition,so its hot corrosion resistance at 650 ℃ is good.The hot corrosion mechanism of Fe-25A1/11SiC composite coating is the second low temperature hot corrosion.
出处
《焊接》
北大核心
2007年第12期50-53,共4页
Welding & Joining
