NiCoCrAlY/YSZ梯度涂层热力学性能的有限元模拟

王士峰 夏明岗 刘明 王玉 王斌 白宇 王海斗

王士峰, 夏明岗, 刘明, 王玉, 王斌, 白宇, 王海斗. NiCoCrAlY/YSZ梯度涂层热力学性能的有限元模拟[J]. 航空材料学报. doi: 10.11868/j.issn.1005-5053.2022.000059
引用本文: 王士峰, 夏明岗, 刘明, 王玉, 王斌, 白宇, 王海斗. NiCoCrAlY/YSZ梯度涂层热力学性能的有限元模拟[J]. 航空材料学报. doi: 10.11868/j.issn.1005-5053.2022.000059
WANG Shifeng, XIA Minggang, LIU Ming, WANG Yu, WANG Bin, BAI Yu, WANG Haidou. Finite element simulation of thermodynamic properties of NiCoCrAlY/YSZ gradient coating[J]. Journal of Aeronautical Materials. doi: 10.11868/j.issn.1005-5053.2022.000059
Citation: WANG Shifeng, XIA Minggang, LIU Ming, WANG Yu, WANG Bin, BAI Yu, WANG Haidou. Finite element simulation of thermodynamic properties of NiCoCrAlY/YSZ gradient coating[J]. Journal of Aeronautical Materials. doi: 10.11868/j.issn.1005-5053.2022.000059

NiCoCrAlY/YSZ梯度涂层热力学性能的有限元模拟

doi: 10.11868/j.issn.1005-5053.2022.000059
基金项目: 国家自然科学基金重点项目(52130509);国家自然科学基金面上项目(52075542);国家重点研发计划(2018YFB2004002);国家自然科学基金青年项目(52005388)
详细信息
    通讯作者:

    白宇(1983—),男,博士,教授,主要从事新型陶瓷涂层、金属陶瓷复合涂层的研究,联系地址:陕西省西安市碑林区咸宁西路28号西安交通大学(710049),E-mail: byxjtu@mail.xjtu.edu.cn

  • 中图分类号: TG148

Finite element simulation of thermodynamic properties of NiCoCrAlY/YSZ gradient coating

  • 摘要: 采用代表体积单元法建立了NiCoCrAlY/YSZ梯度热障涂层的有限元二维微观模型,计算不同相成分配比下梯度层的热物理性能参数,将参数结果推广到三维多层涂层实体模型,研究热循环过程中双层结构涂层和梯度结构涂层的热力学性能。结果表明:梯度层的弹性模量、泊松比、热膨胀系数、导热系数与各相成分比例近似呈线性关系,导热系数受各相分布形态的影响;当梯度层中NiCoCrAlY相成分比例为0.7以下时,导热系数较低,常温状态最高为2.91 W·m−1·K−1。相比于双层结构涂层,梯度结构涂层的YSZ成分比例降低20%,隔热温度降低14%,陶瓷面层在高温时产生的热失配径向拉应力降低47%,轴向拉应力降低32%,切应力降低37%,冷却后的残余应力降低50%,这归因于涂层结构的梯度化能有效降低因涂层与基体热膨胀系数不同而产生的热失配应力。根据涂层应力分布结果,涂层易在TC/BC界面的中心区域形成垂直裂纹,外侧靠近边缘处形成水平裂纹。

     

  • 图  1  梯度结构热障涂层 (a)显微结构形貌;(b)微观结构模型

    Figure  1.  Gradient structured thermal barrier coating  (a)microstructure morphology;(b)microstructural model

    图  2  梯度层的热物理性能参数分析模型的边界条件 (a)弹性模量及泊松比;(b)导热系数;(c)热膨胀系数

    Figure  2.  Boundary conditions of thermophysical properties analysis model of gradient layer  (a)elasticity modulus and Poisson's ratio;(b)thermal conductivity;(c)coefficient of thermal expansion

    图  3  涂层系统的实体结构有限元模型  (a)实体模型;(b)双层结构涂层;(c)三层梯度涂层;(d)五层梯度涂层

    Figure  3.  Solid structure finite element model of coating system  (a)solid model;(b)double-layer coating;(c)three-layer gradient coating;(d)five-layer gradient coating

    图  4  不同温度下梯度层的热物理性能参数随NiCoCrAlY相比例变化曲线  (a)弹性模量;(b)泊松比;(c)导热系数;(d)热膨胀系数;(e)热容;(f)密度

    Figure  4.  Variation curves of thermophysical properties of the gradient layer with different proportion of NiCoCrAlY phase at different temperatures  (a)elasticity modulus;(b)Poisson's ratio;(c)thermal conductivity;(d)coefficient of thermal expansion;(e)thermal capacity;(f)density

    图  5  涂层热导率的有限元计算结果与实验测试结果

    Figure  5.  Finite element calculation results and experimental test results of the thermal conductivity of coating

    图  6  不同结构涂层的隔热模拟结果  (a)涂层轴向温度分布;(b)涂层隔热性能对比

    Figure  6.  Thermal insulation simulation results of coatings with different structures (a)axial temperature distribution of coatings;(b)comparison of insulation properties of coatings

    图  7  不同结构涂层的合金底层产生的剪切应力  (a)高温状态;(b)室温状态

    Figure  7.  Shear stresses generated in alloy base layers with different structural coatings  (a)high temperature condition;(b)room temperature condition

    图  8  不同结构涂层的陶瓷面层产生的最大轴向拉应力

    Figure  8.  Maximum axial tensile stresses generated in ceramic top layers with different structural coatings

    图  9  不同结构涂层的陶瓷面层产生的径向拉应力对比  (a)各涂层产生的最大径向拉应力;(b)双层、三层梯度、五层梯度涂层应力分布;(c)三层梯度涂层应力分布;(d)五层梯度涂层应力分布

    Figure  9.  Comparison of the maximum radial tensile stresses generated in ceramic top layers with different structural coatings  (a)maximum radial tensile stress generated in each coating;(b)stress distributions in double-layer, three-layer gradient and five-layer gradient coatings;(c)stress distribution in three-layer gradient coating;(d)stress distribution in five-layer gradient coating

    表  1  材料热物理性能参数

    Table  1.   Thermophysical properties of materials

    MaterialTemperature/℃E/GPaνα/(10−6·K−1)κ/(W·m−1·K−1)C/(J·kg−1·K−1)ρ/(kg·m−3)
    YSZ20105.40.257.91.0325004580
    2000.258.771.0324580
    4000.259.460.9115764580
    6000.2510.340.7884580
    8000.2510.710.6616374580
    10000.2511.700.6224580
    11000.2512.200.6224580
    NiCoCrAlY202000.3013.65.84008100
    2001900.3014.27.54008100
    4001750.3114.69.54008100
    6001600.3115.212.04008100
    8001450.3216.114.54008100
    10001200.3317.216.24008100
    11001100.3317.617.04008100
    Casting aluminum alloy20840.3221.01304002680
    400700.3221.81484002680
    下载: 导出CSV

    表  2  双层涂层和梯度涂层的层数和成分比例

    Table  2.   Number of layer and composition ratios of double-layer coating and gradient coating

    Coating typeModelLayerProportion of NiCoCrAlY in each layer
    Double-layer coatingG0
    Three-layer gradient coatingG3-130.20.50.8
    G3-230.30.50.7
    G3-330.40.50.6
    Five-layer gradient coatingG5-150.20.30.50.70.8
    G5-250.20.40.50.60.8
    G5-350.30.40.50.60.7
    下载: 导出CSV

    表  3  网格无关性验证结果

    Table  3.   Grid independent validation results

    Gradient structureModel parameter
    Element size/μmElement numberMaximum mises/MPa
    SUB100-1000204000308.35
    50-1000240000308.38
    BC and GC2580000308.35
    16128000308.37
    TC50240000316.61
    37.5320000320.71
    下载: 导出CSV
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  • 收稿日期:  2022-04-18
  • 修回日期:  2022-05-18
  • 网络出版日期:  2022-10-11

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