在工作环境中,典型的等离子喷涂热障涂层结构会在陶瓷层和氧化层界面出现分层现象,导致冷却过程中受面内压应力作用的陶瓷层发生屈曲和剥落失效现象.本文采用能量方法建立了分层后陶瓷层(边界固支单层板)屈曲的临界条件,分析了分层形状、陶瓷层面内应力、弹性模量、厚度对临界条件的影响.这些结果可为考虑陶瓷层屈曲失效的寿命预测模型提供一定的理论依据.
[1] 李志华, 李焕喜, 徐惠彬, 宫声凯. 热障涂层的残余应力分析 [J]. 北京航空航天大学学报 2004.doi:10.3969/j.issn.1001-5965.2004.03.020
[2] NISSLEY D M. Thermal barrier coating life modeling in gas turbine engines [A]. Cleveland:Ohio 1995.
[3] E. A. G. SHILLINGTON, D. R. CLARKE. SPALLING FAILURE OF A THERMAL BARRIER COATING ASSOCIATED WITH ALUMINUM DEPLETION IN THE BOND-COAT [J]. Acta materialia 1999, 4(4).
[4] Rabiei A., Evans A.G.. FAILURE MECHANISMS ASSOCIATED WITH THE THERMALLY GROWN OXIDE IN PLASMA-SPRAYED THERMAL BARRIER COATINGS [J]. Acta materialia 2000, 15(15).
[5] BOSE S, DEMASI-MARCIN J. Thermal barrier coating experience in gas turbine engine at Pratt&Whitney [A]. Cleveland:Ohio 1995.
[6] J. Thornton, D. Cookson, E. Pescott. The measurement of strains within the bulk of aged and as-sprayed thermal barrier coatings using synchrotron radiation [J]. Surface & Coatings Technology 1999, 0(0).
[7] V. Teixeira, M. Andritschky, W. Fischer, H. P. Buchkremer, D. Stover. Effects of deposition temperature and thermal cycling on residual stress state in zirconia-based thermal barrier coatings [J]. Surface & Coatings Technology 1999, 0(0).
[8] M V斯温, 郭景坤. 陶瓷的结构与性能 [M]. 北京:科学出版社 1998.
[9] A. G. Evans, D. R. Mumm, J. W. Hutchinson, G. H. Meier, F. S. Pettit. Mechanisms controlling the durability of thermal barrier coatings [J]. Progress in materials science 2001, 5(5).
