APS制备7YSZ热障涂层镀铝改性的抗氧化性（英文）
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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 7 YSZ( ZrO_2-7 wt% Y_2 O_3) 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. 7 YSZ is a transparent material for oxygen ion diffusion.Thus,preparation of an oxygen ion diffusion barrier on 7 YSZ 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-Al_2 O_3 layer was in situ synthesized on 7 YSZ coating surface through the reaction of Al and ZrO_2,where the formed α-Al_2 O_3 overlay can act as an oxygen ion diffusion barrier. Moreover,the effect of heat treatment pressure on oxidation resistance for Al-modified 7 YSZ TBC also had been investigated.
The use of TBC( thermal barrier coating) generally consisting of a 7 YSZ( ZrO_2-7 wt% Y_2 O_3) 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. 7 YSZ is a transparent material for oxygen ion diffusion.Thus,preparation of an oxygen ion diffusion barrier on 7 YSZ 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-Al_2 O_3 layer was in situ synthesized on 7 YSZ coating surface through the reaction of Al and ZrO_2,where the formed α-Al_2 O_3 overlay can act as an oxygen ion diffusion barrier. Moreover,the effect of heat treatment pressure on oxidation resistance for Al-modified 7 YSZ TBC also had been investigated.
引文
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2 Tawancy H M,Mohammad A I,Al-Hadhrami L M,et al. Engineering Failure Analysis,2015,57,1.
3 Tahan M,Tsoutsanis E,Muhammad M,et al. Applied Energy,2017,198,122.
4 Jones S A,Hyde T. Engineering Failure Analysis,2013,27(1),150.
5 Hernandeza M T,Karlssona A M,Bartsch M. Surface&Coatings Technology,2009,203,3549.
6 Nijdam T J,Sloof W G. Surface&Coatings Technology,2006,201,3894.
7 Tolpygo V K,Clarke D R. Surface&Coatings Technology,2005,200,1276.
8 Bai B,Guo H B,Peng H,et al. Corrosion Science,2011,53,2721.
9 Yan K. Guo H B,Gong S K. Corrosion Science,2013,75,337.
10 Nejati M,Rahimipour M R,Mobasherpour I,et al. Surface&Coatings Technology,2015,282,129.
11 Afrasiabi A,Saremi M,Kobayashi A. Materials Science&Engineering A,2008,478,264.
12 Zhang X F,Zhou K S,Xu W,et al. Ceramics International,2014,40,12703.
13 Zhang X F,Zhou K S,Xu W,et al. Materials Science&Engineering,2015,31,1006.
14 Zhang X F,Zhou K S,Dong S J,et al. Transactions of Nonferrous Metals Society of China,2015,25,2587.
15 Zhang X F,Zhou K S,Xu W,et al. Surface&Coatings Technology,2015,261,54.