采用电子束物理气相沉积方法(EB-PVD)在NiCrAlY粘结层上沉积Y2O3部分稳定的ZrO2陶瓷层.对样品进行了1050℃的热循环实验.结果表明,沉积态陶瓷层表面比较致密,其柱状晶粒簇拥成团,晶粒簇间存在间隙.随着热循环不断进行,陶瓷层表面变得疏松,晶粒簇间距增大,相邻较大的间隙互相连接成微裂纹,并逐渐横向及纵向扩展.1050℃循环200次,粘结层氧化物是均匀连续的一薄层,主要由Al2O3组成;循环300次后,出现了NiO、尖晶石等氧化物.根据显微结构观察和EDS、XRD分析结果,提出了EB-PVD热障涂层热循环的失效机理.
参考文献
| [1] | R A Miller .Current status of thermal barrier coatings-an overview[J].Surface and Coatings Technology,1987,30:1-11. |
| [2] | R A Miller .Thermal barrier coatings for aircraft engines: history and directions[J].Journal of Thermal Spray Technology,1997,6(01):35-42. |
| [3] | A S James;A Matthews.Developments in R F Plasma-assisted physical vapor deposition partially yittria-stablized zirconia thermal barrier coatings[J].Surface and Coatings Technology,1990:436-445. |
| [4] | 李美姮,张重远,孙晓峰,胡望宇,管恒荣.一种热障涂层的形貌和相结构特征研究[J].材料导报,2001(01):71-73. |
| [5] | A Bennett .Properties of thermal barrier coatings[J].Materials Science and Technology,1986,2(03):257-261. |
| [6] | T N Rhys-Jones .Coatings for blade and vane applications in gas turbines[J].Corrosion Science,1989,29:623-646. |
| [7] | K H G Schmitt-Thoma;U Dierl.Thermal barrier coating with improved oxidation resistance[J].Surface and Coatings Technology,1994:113-115. |
| [8] | E Y Lee;R R Biedrman;R D Sisson .Diffusional interactions and reactions between a partially stabilized zirconia thermal barrier coating and the NiCrAlY bond coat[J].Materials Science and Engineering,1989,A121:467-473. |
| [9] | S Stecura .Two-layer thermal barrier coatings I: effects of composition and temperature on oxidation behavior and failure. Stephan Stecura[J].THIN SOLID FILMS,1989,182:121. |
| [10] | 李美姮 .一种单晶高温合金NiCrAlY/ZrO<,2>热障涂层的氧化行为[D].湖南大学,2000. |
| [11] | F Wang .The effect of nanocrystallization on the selective oxidation and adhesion of Al2O3 scales[J].Oxidation of Metals,1997,48:215-224. |
| [12] | 李美姮,孙晓峰,张重远,宫声凯,胡望宇,管恒荣,胡壮麒.EB-PVD热障涂层热循环过程中粘结层的氧化和相结构[J].金属学报,2002(01):79-83. |
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