激光与光电子学进展, 2018, 55 (2): 021412, 网络出版: 2018-09-10   

网状结构热障涂层的激光快速成型及抗热震性 下载: 1122次

Thermal Shock Resistance and Laser Rapid Prototyping of Thermal Barrier Coatings with Network Structures
作者单位
南京理工大学材料科学与工程学院, 江苏 南京 210094
摘要
为了提高航空发动机热端部件的热障涂层(TBCs)与基体的结合强度、延长涂层使用寿命,利用激光快速成型技术在高温合金基体上制备了网状结构的衬垫,用等离子喷涂法制备了陶瓷涂层,并通过实验比较该陶瓷涂层与传统两层结构涂层的抗热震性能。基于热弹塑性力学理论,建立了二维有限元数值模型,分析了热震中网状衬垫对热障涂层应力分布的影响。结果表明,传统两层结构与具有网状衬垫的热障涂层分别在经历45和111次热震后失效,且由于陶瓷层和粘结层之间生长的热氧化层(TGO),边缘位置的陶瓷层均发生剥落。数值分析结果表明,网状衬垫的加入使得涂层边界区域的应力集中得到改善,涂层剥落被有效抑制,从而使得热障涂层抗热震性能提高。
Abstract
In order to improve the bonding strength between substrates and thermal barrier coatings (TBCs) of hot components of aircraft engines and prolong service life of coatings, the laser rapid prototyping technology is applied to fabricate a network structure on a superalloy substrate, and the plasma spraying method is for ceramic coatings. The thermal shock resistance of these TBCs is studied experimentally and compared with that of traditional coatings with a two-layer structure. To further analyze the effect of the network structure on the stress distribution of TBCs, a two-dimensional finite element numerical model is established based on the thermo-elastic-plastic theory. The results show that the TBCs with a traditional two-layer structure and a network structure fail after 45 and 111 thermal shocks, respectively. Due to the thermally grown oxide layer (TGO) along the interface between the layers of ceramic and bond coating, a spalling of the ceramic layer near the edge is observed for both kinds of TBCs. Further numerical analysis results show that the concentration of stress on the boundary region is relatively released with the help of the network structure. Accordingly, the cracks originated on the boundary are effectively suppressed, which reasonably makes the thermal shock resistance improvement of TBCs.

周逸波, 秦渊, 杨森. 网状结构热障涂层的激光快速成型及抗热震性[J]. 激光与光电子学进展, 2018, 55(2): 021412. Yibo Zhou, Yuan Qin, Sen Yang. Thermal Shock Resistance and Laser Rapid Prototyping of Thermal Barrier Coatings with Network Structures[J]. Laser & Optoelectronics Progress, 2018, 55(2): 021412.

本文已被 2 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!