Numerical Simulation for Surface Modification of Thermal Barrier Coatings by High-Current Pulse Electron Beam
Numerical Simulation for Surface Modification of Thermal Barrier Coatings by High-Current Pulse Electron Beam
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DOI：
10.4028/www.scientific.net/msf.654-656.1807
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Ying Qin;W. Qu;X. Mei;S. Hao;J. Zhao;Wen-qi Lu;C. Dong
中科院分区：
文献类型：
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作者：
Ying Qin;W. Qu;X. Mei;S. Hao;J. Zhao;Wen-qi Lu;C. Dong
大电流脉冲电子束是电子束物理气相沉积制备陶瓷热障涂层的一种有效的表面密封技术。由于快速重熔和凝固，陶瓷涂层外层变得光滑致密，有效提高了涡轮叶片的防护性能。由于涂层具有复杂的多层结构，大电流脉冲电子束处理需要特定的参数输入，这些参数输入与涂层中电子能量沉积引起的温度场有关。本文采用二维温度模拟的方法研究了大电流脉冲电子束作用下陶瓷涂层的熔化深度和温度演变。对不同的能量密度和脉冲进行了研究和讨论，以获得最佳参数。
High current pulsed electron beam is an effective technique for surface sealing of ceramic thermal barrier coatings prepared by electron beam physical vapor deposition. Due to the rapid remelting and solidification, the outer layers of ceramic coatings become smooth and dense, and the protective performance for turbine blades is effectively improved. Because of the complex multi-layered structures in the coatings, a high-current pulsed electron beam treatment requires specific parameter inputs which are related to the temperature field induced by electron energy deposition in the coatings. In this paper, a two-dimensional temperature simulation was performed to demonstrate the melting depth and temperature evolution in ceramic coatings treated by high-current pulsed electron beam. Different energy densities and pulses were studied and discussed for obtaining optimized parameters.