摘要
采用HVOF喷涂工艺,在620℃等级超超临界汽轮机阀杆试样表面制备了以NiCr-Cr_3C_2为喷涂材料的金属陶瓷涂层,并分别对涂层的显微硬度、结合力、微观组织形貌及620℃下长时间氧化试验后涂层变化等进行了一系列的检测分析。结果表明,涂层各项性能良好,经620℃下长时间氧化试验后,涂层的结合强度、硬度及孔隙率不发生变化,且涂层属于完全抗氧化级别。
HVOF spraying process was adopted to continuously test and explore,the metal ceramic coating with NiCr-Cr 3C 2 as spraying material was prepared on the sample surface of valve stem for ultra-supercritical steam turbine working at 620℃,and the microhardness,bonding force,microstructure,nondestructive test of the coating and coating changes after long-time oxidation test at 620℃were determined and analyzed separately.Test results shows that the properties of the coating performed well,the bonding strength,hardness and porosity of the coating are not changed after long-time oxidation test at 620℃,and the coating is of a complete anti-oxidation class and is suitable for use on the valve stem for ultra-supercritical steam turbine working at 620℃.
作者
刘新新
LIU Xin-xin(Material College of Tsinghua University,Beijing 100084,China;Harbin Turbine Company Limited,Harbin 150046,China)
出处
《汽轮机技术》
北大核心
2020年第5期396-398,334,共4页
Turbine Technology
关键词
超音速火焰喷涂
阀杆
涂层
氧化试验
supersonic flame spraying
valve stem
coating
oxidation test
