摘要
运用微弧等离子喷涂制备了碳化硅晶须(SiCw)掺杂部分稳定ZrO2(YPSZ)复合热障涂层(CTBCs),对涂层进行了显微组织观察、EDS分析、XRD分析和抗热震性能试验.喷涂过程中,复合粉末里的部分SiCw在高温下分解产生的气体夹杂在熔融的颗粒内形成气孔,另一部分沉积在涂层中起到降低热应力和钉扎、桥联作用.结果表明,随着粉末中SiCw含量的增加,复合陶瓷层的孔隙率呈增大趋势;复合涂层的抗热震性能优于单纯氧化锆涂层,SiCw含量为20%的复合涂层的抗热震性能最优.
SiC whisker(SiCw)/ZrO2 composite thermal barrier coatings(CTBCs) were sprayed by micro-plasma on stainless steel substrates.Both nano-ZrO2 and micro-ZrO2 were used in the CTBCs.The zirconia powders were 7 wt% Y2O3 partially stabilized ZrO2(YPSZ).Microstructure of the coatings was analyzed by scanning electron microscopy(SEM).The chemical composition of the top coating was measured by energy dispersive X-ray(EDX).Phase content of the coatings investigated by X-ray diffraction(XRD).In the spraying process,a large quantity of SiCw in the powder has been decomposed at high temperature,which produces pores in the top coating,and little SiCw embedded in the top coating decreases the thermal stress,nailing and bridging the coating.With SiCw content increasing, the porosity of composite TBCs was increased,and the thermal shock life was improved firstly and weakened later.The highest thermal shock resistance was achieved at 20% volume ratio of SiCw to nano-ZrO2,was better than that of the single ZrO2 coatings.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第4期84-88,共5页
Transactions of The China Welding Institution
关键词
热障涂层
微弧等离子喷涂
碳化硅晶须
复合涂层
抗热震性能
thermal barrier coatings(TBCs)
micro-plasma spray
SiC whisker
composite coating
thermal shock resistant
