先进涂层体系的跨尺度硬度及界面梯度效应研究
Investigation on Trans-Scale Hardness and Interface Gradient Effect of Advanced Coating System
查看参考文献11篇
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文摘
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作为先进涂层,微米/纳米颗粒陶瓷涂层在航空发动机叶片等关键部件中应用广泛,其力学性能在较大程度上决定着部件服役的寿命及可靠性。先进涂层的宏观力学性能紧密依赖于其微观结构,即其具有跨尺度力学特性。对跨尺度力学行为的研究既是前沿热点,又对先进涂层设计具有重要意义。首先观察和分析了微米/纳米颗粒(8YSZ)热障涂层/Ni基超合金体系的微观结构,然后采用耦合纳米/宏观压痕法实验和基于应变梯度和表界面效应的跨尺度力学理论研究了硬度及弹性模量的跨尺度行为。跨尺度硬度研究发现,涂层表面宏观硬度服从Weibull统计分布,纳米结构涂层硬度分散性较小;纳米压痕硬度较高且随压深增加而减小。进而开展了对界面粘结层附近的压痕硬度分布研究,结果显示:无论是涂层还是基底,硬度及模量都随离开界面距离的增加而减小。 |
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其他语种文摘
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As an advanced coating,micro-/nano-particle ceramic coating is widely used in key components such as aeroengine blades.Its mechanical properties determine the service life and reliability of components to a large extent.The macroscopic mechanical properties of the advanced coatings are closely dependent on their microstructure,that is to say,they have trans-scale mechanical properties.The study of trans-scale mechanical behavior is not only a hot spot,but also of great significance for advanced coating design.In this paper,the microstructure of micro-/nano-particle 8YSZ thermal barrier coating/Ni-based super-alloy system was observed and analyzed firstly.Then,the trans-scale behavior of hardness and elastic modulus was studied by coupling nano-/macro-indentation experiment and trans-scale mechanical theory based on strain gradient and surface/interface effect.It is found that the macroscopic hardness of the surface obeys the Weibull statistical distribution,and the hardness dispersion of the nano-structure coating is small;the hardness of the nano-indentation is high and decreases with the increase of the indentation depth.Moreover,the hardness and modulus decrease with the increase of the distance from the interface. |
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来源
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中国材料进展
,2020,39(10):723-727 【核心库】
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DOI
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10.7502/j.issn.1674-3962.202005005
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关键词
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陶瓷涂层
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纳米压痕
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硬度
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模量
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跨尺度
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界面
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地址
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1.
北京化工大学机电学院, 北京, 100029
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北京大学工学院力学与工程科学系, 北京, 100871
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中国科学院力学研究所, 非线性力学国家重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1674-3962 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金资助项目
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哈尔滨工业大学特种环境复合材料技术国防科技重点实验室基金项目
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文献收藏号
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CSCD:6883221
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