摘要
Plasma spray-physical vapor deposition(i.e.,PS-PVD)is a promising method for obtaining advanced environmental barrier coatings(EBCs).The EBCs must meet some requirements in the application,in which the thermal cycle performance affects the service lifetime.The preparation of artificial vertical cracks in Yb_(2)SiO_(5) coatings is an effective approach for meeting the requirements above because vertical cracks provide a strain tolerance.To clarify the formation mechanism of vertical cracks during the PSPVD,the effects of coating thickness and substrate temperature on the formation of vertical cracks were investigated.In addition,the interactions of spray powder and plasma flame during coating deposition were also characterized by optical spectroscopy.It is indicated that vertical cracks are formed due to a thermal expansion mismatch between Yb_(2)SiO_(5) and mullite coating,transient cooling after deposition and the nucleation of evaporated Yb_(2)SiO_(5) as well.
基金
financial supports from National Natural Science Foundation of China(No.51801034,No.51771059)
Guangdong Academy of Sciences Program(No.2020GDASYL-20200104030,No.2018GDASCX-0402,No.2017GDASCX-0202,No.2017GDASCX-0111)
Guangdong Technical Research Program(No.2017B090916002,No.2017A070701027,No.2014B07075007)
Guangdong Natural Science Foundation(No.2016A030312015,No.2017A030310315)
Guangzhou Technical Research Program(No.201906010015,No.201707010455,No.201707010385).
作者简介
Corresponding author:Dr.Xiaofeng Zhang,is a senior engineer at National Engineering Laboratory of Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,China.He received his Ph.D.degree in Materials Processing Engineering from South China University of Technology in 2016.Now,he works in City University of Hong Kong as senior research associate.His research interests focus on thermal/environmental barrier coatings.So far,he published 113 papers and received 11 patents.National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou,510650,China.E-mail addresses:zxf200808@126.com;Corresponding author:Xinghua Liang,E-mail addresses:309602373@qq.com。
