摘要
热障涂层(TBC)的使用对燃气轮机的寿命和效率都有明显提升,而TBC一般是由金属粘结层和ZrO_2-7%(质量分数) Y_2O_3(7YSZ)陶瓷层组成。与飞行器推进系统的TBC相比,燃气轮机的服役环境有其特殊性。在工业燃气轮机服役过程中,TBC系统中金属粘结层的氧化是导致涂层过早失效最重要的原因之一。TGO(热生长氧化层)的形成不可避免,但抑制TGO的生长速率可以提高TBC的使用寿命,而7YSZ是一种对氧离子扩散几乎无阻碍作用的材料。因此,在7YSZ涂层上覆盖一层氧离子扩散障碍膜是阻止TGO生成的一种可行方法。本研究中,在7YSZ涂层表面沉积一层铝膜。经热处理后,在7YSZ涂层表面通过Al和ZrO_2原位反应生成α-Al_2O_3层,该层可以作为氧离子扩散障碍层。此外,对热处理压力和铝改性的7YSZ涂层抗氧化性关系进行了研究。
The use of TBC( thermal barrier coating) generally consisting of a 7YSZ( ZrO2-7 wt% Y2O3) ceramic coating and a metallic bond coating has provided significant improvements in durability and efficiency for gas turbine engines to generate power,where the operation condition has its particularity compared with the TBC used in aircraft propulsion. During the service of industrial gas turbine engine,oxidation of metallic coating in TBC system is one of the most important failure factors leading to premature. Although TGO( thermally grown oxide) formation is inevitable,hindering grown rate of TGO contributes to prolong the operation lifetime of TBC. 7YSZ is a transparent material for oxygen ion diffusion.Thus,preparation of an oxygen ion diffusion barrier on 7YSZ surface is an alterative method for restraining TGO grown. In this investigation,an Al film was deposited on 7 YSZ surface. After heat treatment,an α-Al2O3 layer was in situ synthesized on 7YSZ coating surface through the reaction of Al and ZrO2,where the formed α-Al2O3 overlay can act as an oxygen ion diffusion barrier. Moreover,the effect of heat treatment pressure on oxidation resistance for Al-modified 7YSZ TBC also had been investigated.
作者
许世鸣
张小锋
刘敏
邓春明
邓畅光
牛少鹏
XU Shiming;ZHANG Xiaofeng;LIU Min;DENG Chunming;DENG Changguang;NIU Shaopeng(School of Materials Science and Engineering,Central South University,Changsha 410083;National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510650)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第2期283-287,共5页
Materials Reports
基金
financially supported by the National Key Research Program(2017YFB0306100)
the Project of Guangdong Academy of Sciences(2017GDASCX-0843,2017GDASCX-0202)
the Guangdong Science and Technology Research Project(2014B070706026)
Guangdong Natural Science Foundation(2016A030312015,2017A030310315)
Guangzhou Science and Technology Research Project(201605131008557,201707010385,201510010095)~~
