摘要
大气等离子喷涂热障涂层因其高热膨胀系数、高断裂韧性和低热导率等良好的特性而被广泛应用于燃气涡轮发动机.研究了冲蚀粒子以及涂层孔隙的参数对涂层的冲蚀失效行为,利用有限元方法构建仿真模型,考虑冲蚀粒初速度的情况下,对不同粒子大小、孔径和孔隙率下模型受到刚体粒子冲蚀作用后的回弹速度、凹坑深度、裂纹扩展长度和冲蚀损失质量进行分析.结果表明,孔隙结构变化显著影响了涂层的抗冲蚀性能.整体来看,冲蚀粒子直径、涂层孔径和孔隙率的增大等因素都会导致涂层受到更严重的损伤.其中,孔径为0.3μm、孔隙率约为5%时,均匀分布的涂层的抗冲蚀性能最优.这些发现强调了冲蚀粒子、孔径和孔隙率对热障涂层抗侵蚀性能的关键作用,为提高其抗侵蚀性能和延长使用寿命提供了理论和实践见解.
Air plasma-sprayed thermal barrier coatings(APS-TBCs)are widely used in gas turbine engines due to their high thermal expansion coefficient,high fracture toughness,and low thermal conductivity.This paper primarily investigates the impact of erosive particle parameters and coating porosity on the erosion failure behavior of the coatings.By employing the finite element method to construct simulation models,we analyze the rebound velocity,pit depth,crack propagation length,and erosion mass loss of the model subjected to rigid particle erosion under varying particle sizes,pore sizes,and porosities,considering the size and initial velocity of the erosive particles.The results indicate that changes in the pore structure significantly affect the coating's resistance to erosion.Overall,factors such as an increase in the diameter of erosive particles,coating pore size,or porosity can lead to more severe damage to the coating.Optimal erosion resistance is observed in coatings with a pore size of 0.3 μm,a porosity of approximately 5%,and a uniform distribution.These findings emphasize the critical role of erosive particle size,pore size,and porosity in enhancing the erosion resistance of TBCs,providing theoretical and practical insights for enhancing their durability and prolonging service life.
作者
崔诗雨
王毅
赵新
CUI Shiyu;WANG Yi;ZHAO Xin(Zhengzhou University of Aeronautics,Zhengzhou 450046,China;National Key Laboratory of Air-based Information Perception and Fusion,Luoyang 471009,Henan China)
出处
《河南科学》
2024年第8期1120-1130,共11页
Henan Science
基金
河南省科技攻关计划项目(220102210209)
河南省重点研发专项项目(221111230700)
航空科学基金(20220001055003)
河南省高等学校重点科研项目(23A590002)
郑州航院研究生教育创新计划基金项目(2023CX82)。
关键词
热障涂层
有限元分析
裂纹扩展
冲蚀损伤
thermal barrier coatings
finite element analysis
crack propagation
erosion damage
