ZrO2/NiCoCrAlY功能梯度涂层残余应力分析Analysis on the Residual Stresses in Functionally Gradient ZrO2/NiCoCrAlY Coatings
张显程,徐滨士,王海斗,吴毅雄
摘要(Abstract):
采用有限元方法研究了等离子ZrO2 NiCoCrAlY功能梯度涂层形成过程中的热力学行为以及残余应力的分布。结果表明,由于涂层与基体的热膨胀系数不匹配等原因,在界面等区域存在严重的应力集中。涂层与基体厚度比、中间层以及喷涂过程的冷却速率对残余应力水平有很大影响。涂层内部关键区域的残余应力水平,随着涂层厚度增加而增加;5 0 %ZrO2 +5 0 %NiCoCrAlY中间层对降低涂层内部的应力水平是有利的,但并不能消除涂层内部的应力集中;对于瞬态分析而言,涂层内部的应力随着冷却速度的增加而增加。
关键词(KeyWords): 残余应力;功能梯度涂层;中间层;冷却速率
基金项目(Foundation): 国家自然科学基金重点项目 (50 2 350 30 ) ;; 国家“863”项目(2 0 0 3AA331 1 30 ) ;; 国家“973”项目 (G1 9990 650 0 9)
作者(Author): 张显程,徐滨士,王海斗,吴毅雄
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