摘要
目的研究三电极悬浮液等离子喷涂不同枪基距对涂层组织结构的影响。方法在DZ411高温合金表面制备铂铝涂层后,配制纳米氧化钇稳定氧化锆悬浮液,采用AXIALⅢ型悬浮液等离子喷涂设备,高能喷涂8YSZ热障涂层,探索不同枪基距对热障涂层组织结构的影响规律。采用扫描电子显微镜和X射线衍射仪,分析YSZ沉积态和退火态陶瓷涂层的组织结构。结果喷涂所得的YSZ热障涂层呈花菜状,涂层均为非平衡t'相微纳米组织结构。随着喷枪与基体之间的距离增加,所获涂层的结晶度较好,粗糙度逐渐提高,菜花状颗粒尺度逐渐增大,涂层内部孔洞数量逐渐增加。涂层在1100℃退火后,出现不同程度的剥落、界面剥离以及横纵向裂纹搭接的现象。仅枪基距为105mm的YSZ涂层孔洞数量最多,且退火后并未出现明显的涂层剥离现象。结论利用三电极等离子喷涂纳米YSZ悬浮液获得花菜状热障涂层,探讨了枪基距的不同对涂层组织结构的影响,涂层厚度的增加使得涂层结晶程度增加、孔隙高、裂纹少,且膜基界面的热稳定性好。
Thermal barrier coatings(TBCs)are usually prepared by air plasma spraying(APS)technology and electron beam-physical vapor deposition(EB-PVD)process.However,these two processes cannot balance two following advantages of insulation performance and strain tolerance simultaneously,which will restrict the coating in different applications to some extent.In recent years,the suspension plasma spraying(SPS)with three electrodes has attracted much attention from Chinese and foreign researchers because of its advantages of high energy plasma,nano powder feeding spraying,and a large amount of microporous structure.Suspension plasma spraying technology can contribute to flexibly columnar crystals,inside which layered structures in nano size can also be pertained,resulting in both advantages of insulation and thermal shock resistance characteristics.Therefore,in this work,β-(Ni,Pt)Al coatings was prepared on the surface of DZ411 high-temperature nickel-base superalloy by electrodeposition and gaseous aluminisation treatment.Subsequently,a kind of suspension was prepared with a nano-sized yttria stabilization zirconia(YSZ)into a mixed solution of distilled water and alcohol.Then,8YSZ thermal barrier coatings were sprayed by AXIALⅢsuspension plasma spraying equipment with high energy plasma,in order to obtain the cauliflower-like structure,which was the effective integration of columnar and nano-layered structure.The effect on microstructural changeable regularity of the 8YSZ thermal barrier coatings was systematically explored at different stand-off distance between spraying gun and substrates,e.g.,90 mm,95 mm,100 mm,and 105 mm.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)devices were used to analyze the microstructure of as-deposited and annealed YSZ ceramic coatings at different stand-off distance.The results showed that the YSZ thermal barrier coating obtained by this kind of suspension plasma spraying technology exhibited a cauliflower-like structure.All the sprayed YSZ thermal barrier coatings presented a
作者
刘保侠
张盟
周绪强
牛云松
黄迪
杨沁乾
鲍泽斌
朱圣龙
LIU Baoxia;ZHANG Meng;ZHOU Xuqiang;NIU Yunsong;HUANG Di;YANG Qinqian;BAO Zebin;ZHU Shenglong(PipeChina North Pipeline Company Compressor-Set Maintenance Repair&Overhaul Center,Hebei Langfang 065000,China;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Shi Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第17期202-207,217,共7页
Surface Technology
基金
国家自然科学青年基金(51701223)。
关键词
悬浮液等离子喷涂
热障涂层
花菜状
枪基距
suspension plasma spraying
thermal barrier coating
cauliflower-like
stand-off distance
