【摘要】 采用等离子喷涂技术在20钢表面制备Al2O3陶瓷涂层。利用扫描电镜、能谱仪、X射线衍射仪对涂层的微观组织、成分及物相组成进行了表征,在不同温度下对试样进行隔热性能测试。结果表明:涂层厚约0.40 mm,涂层截面是由涂层和许多孔洞组成,20钢基体与过渡层以及陶瓷层与过渡层之间形成良好的机械结合界面;涂层内主要含有SiO2、Al2O3、Na2O、NaAlO2;喷涂陶瓷涂层后,隔热性能明显提高,在550℃时Al2O3陶瓷涂层能使试样表面温度降低80℃左右。更多还原

【Abstract】 Al2O3 ceramic coating on the surface of 20 steel was prepared using plasma spraying technology. Microstructure, composition and the phase composition of coating were charactered by SEM, EDS and XRD. Heat insulation performance test was carried out on the specimen under different temperature conditions. Results show that coating section is about 0.40 mm and made up by coatings and many holes. The 20 steel substrate and transition layer obtained the good mechanical bond interface as well as ceramic layer and transition layer. Coating mainly contains SiO2, Al2O3, Na2O, NaAlO2; After spraying ceramic coating, insulation performance is obviously improved and Al2O3ceramic coating can reduce sample surface temperature by about 80 ℃ at 550 ℃.更多还原