热生长氧化物（TGO）的形成与长大是热障涂层失效的根本原因。先在IC10高温合金基体上超音速火焰喷涂（HVOF）NiCoCrAlTaY粘结层（BC层），再等离子喷涂二元稀土氧化物稳定氧化锆Sc2O3-Y2O3-ZrO2，喷涂样在1100℃恒温氧化，利用扫描电镜（SEM）、能谱仪对断面形貌、成分进行分析，讨论了TGO的形成机理及其与热障涂层失效的关系。结果表明：随着恒温氧化时间增加，TGO层底部的Al含量下降，上部、中间弥散颗粒及底部的Ni含量均增加，上部、中间弥散颗粒中Cr含量均减少；喷涂样氧化140h后，TGO层由靠近陶瓷层的富（Cr，A1）2O3层、弥散其间的富Ni颗粒和靠近BC层的Al2O3层组成；TGO的生长速度先由Al与O：化学反应速度决定，接着受BC层金属元素扩散速度影响，最后由化学反应速度和扩散速度共同控制；减少TGO中的有害氧化物含量以降低涂层内的应力，可有效提高涂层的使用寿命。
参考文献
| [1] | Liu H F;Li S L .Investigation on the phase stability,sinte- ring and thermal conductivity of Sc2O3- Y2 O3- ZrO2 for thermal barrier coating application[J[J].J Materials and De- sign,2010,31:2972-2977. |
| [2] | Leoni M;Jones R L;Scardi P .Phase stability of scandia- yttria- stabilized zirconia thermal TBCs[J].Surface and Coatings Technology,1998,108/109(10):107-113. |
| [3] | 刘建明;陈美英;任先京 等.合金元素在MCrAlY涂层中的作用[J].热喷涂技术,2010,2(04):30-34. |
| [4] | Richer, P.;Yandouzi, M.;Beauvais, L.;Jodoin, B. .Oxidation behaviour of CoNiCrAlY bond coats produced by plasma, HVOF and cold gas dynamic spraying[J].Surface & Coatings Technology,2010(24):3962-3974. |
| [5] | Chen WR;Wu X;Marple BR;Lima RS;Patnaik PC .Pre-oxidation and TGO growth behaviour of an air-plasma-sprayed thermal barrier coating[J].Surface & Coatings Technology,2008(16):3787-3796. |
| [6] | Chen WR;Wu X;Marple BR;Patnaik PC .The growth and influence of thermally grown oxide in a thermal barrier coating[J].Surface & Coatings Technology,2006(3/4):1074-1079. |
| [7] | A. Selcuk;A. Atkinson .The evolution of residual stress in the thermally grown oxide on Pt diffusion bond coats in TBCs[J].Acta materialia,2003(2):535-549. |
| [8] | Hernandez, Mercedes T.;Karlsson, Anette M.;Bartsch, Marion .On TGO creep and the initiation of a class of fatigue cracks in thermal barrier coatings[J].Surface & Coatings Technology,2009(23):3549-3558. |
| [9] | Kuznetsov V;Petzow G;Effenberg G.Ternary Alloys[M].New York,1993:434. |
| [10] | E.P. Busso;H.E. Evans;Z.Q. Qian .Effects of breakaway oxidation on local stresses in thermal barrier coatings[J].Acta materialia,2010(4):1242-1251. |
| [11] | A. G. Evans;M. Y. He;J. W. Hutchinson .Mechanics-based scaling laws for the durability of thermal barrier coatings[J].Progress in materials science,2001(3-4):249-271. |
| [12] | Lance M J;Haynes J A;Cannon W R.Ceramic transactions:nondestructive evaluation of ceramics[M].[s.l.]:American Ceramic Society,1998:229. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%