采用超音速等离子弧喷涂设备在35Cr Mo钢基体上制备了Zr O_2/Co Ni Cr Al Y热障涂层,并将涂层加热到1 150℃进行氧化试验。利用扫描电子显微镜和X射线衍射方法对涂层的组织结构和相组成进行了分析,并对元素扩散情况进行研究。结果表明,...采用超音速等离子弧喷涂设备在35Cr Mo钢基体上制备了Zr O_2/Co Ni Cr Al Y热障涂层,并将涂层加热到1 150℃进行氧化试验。利用扫描电子显微镜和X射线衍射方法对涂层的组织结构和相组成进行了分析,并对元素扩散情况进行研究。结果表明,涂层组织致密,界面结合良好,无剥落;粘结层表面存在少量尖角和钩状突出颗粒。热障涂层经过1 150℃加热后,在粘结层与陶瓷层的界面处出现少量深颜色的热生长氧化物(thermally grown oxide,简称TGO);随着氧化时间的延长,TGO层厚度明显增加并且开始连续。通过对Zr O_2-8Y2O3/Co Ni Cr Al Y界面扫描发现,该处Al元素出现了的富集峰,而Cr和Ni元素的含量远小于金属黏结层中含量,并且Cr和Ni元素的变化趋势为沿界面呈梯度下降,TGO层由亚稳态的θ-Al2O3逐渐转变为稳定态的α-Al2O3,有效地提高了涂层的抗高温氧化性能。展开更多
To improve the durability of underwater rotating products,the corrosion characteristics in harsh marine environment were evaluated through various electrochemical experiments on the Al2O3-3TiO2 and CoNiCrAlY coating l...To improve the durability of underwater rotating products,the corrosion characteristics in harsh marine environment were evaluated through various electrochemical experiments on the Al2O3-3TiO2 and CoNiCrAlY coating layers by atmospheric pressure plasma spray coating process.By evaluating the corrosion resistance of these materials,their applicability to environmentally friendly power generation equipment such as blades of tidal current turbines was examined.According to the Tafel analysis for micro-areas including the coating layer,the coating/metal interlayer and the base metal,the Al2O3-3TiO2 coating layer and the CoNiCrAlY coating layer show markedly lower corrosion current density than the base metal.The corrosion current density of the CoNiCrAlY coating layer (9.75316×10-8A/cm2) is about 1.6 times more than that of the Al2O3-3TiO2 coating layer (6.13139×10-8A/cm2).展开更多
文摘采用超音速等离子弧喷涂设备在35Cr Mo钢基体上制备了Zr O_2/Co Ni Cr Al Y热障涂层,并将涂层加热到1 150℃进行氧化试验。利用扫描电子显微镜和X射线衍射方法对涂层的组织结构和相组成进行了分析,并对元素扩散情况进行研究。结果表明,涂层组织致密,界面结合良好,无剥落;粘结层表面存在少量尖角和钩状突出颗粒。热障涂层经过1 150℃加热后,在粘结层与陶瓷层的界面处出现少量深颜色的热生长氧化物(thermally grown oxide,简称TGO);随着氧化时间的延长,TGO层厚度明显增加并且开始连续。通过对Zr O_2-8Y2O3/Co Ni Cr Al Y界面扫描发现,该处Al元素出现了的富集峰,而Cr和Ni元素的含量远小于金属黏结层中含量,并且Cr和Ni元素的变化趋势为沿界面呈梯度下降,TGO层由亚稳态的θ-Al2O3逐渐转变为稳定态的α-Al2O3,有效地提高了涂层的抗高温氧化性能。
基金Project supported by the Ministry of Education,Science Technology(MEST)Korea Industrial Technology Foundation(KOTEF)through the Human Resource Training Project for Regional Innovation
文摘To improve the durability of underwater rotating products,the corrosion characteristics in harsh marine environment were evaluated through various electrochemical experiments on the Al2O3-3TiO2 and CoNiCrAlY coating layers by atmospheric pressure plasma spray coating process.By evaluating the corrosion resistance of these materials,their applicability to environmentally friendly power generation equipment such as blades of tidal current turbines was examined.According to the Tafel analysis for micro-areas including the coating layer,the coating/metal interlayer and the base metal,the Al2O3-3TiO2 coating layer and the CoNiCrAlY coating layer show markedly lower corrosion current density than the base metal.The corrosion current density of the CoNiCrAlY coating layer (9.75316×10-8A/cm2) is about 1.6 times more than that of the Al2O3-3TiO2 coating layer (6.13139×10-8A/cm2).
