Y-TZP/LZAS微晶玻璃功能梯度涂层残余应力的有限元分析*

doi:10.11901/1005.3093.2014.196

材料研究学报

2014, Vol. 28

Issue (10): 787-793 DOI: 10.11901/1005.3093.2014.196

本期目录 | 过刊浏览

Y-TZP/LZAS微晶玻璃功能梯度涂层残余应力的有限元分析*

龚伟^1,²(

),周黎明¹,王恩泽³

1. 西南科技大学制造科学与工程学院绵阳 621010
2. 中国工程物理研究院激光聚变研究中心绵阳 621900
3. 西南科技大学材料科学与工程学院绵阳 621010

Finite Element Analysis of Residual Stresses on Y-TZP/ LZAS Glass-ceramic Gradient Coatings

Wei GONG^1,^2,^**(

),Liming ZHOU¹,Enze WANG³

1. School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010
2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900
3. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010

引用本文:

龚伟,周黎明,王恩泽. Y-TZP/LZAS微晶玻璃功能梯度涂层残余应力的有限元分析*[J]. 材料研究学报, 2014, 28(10): 787-793.
Wei GONG, Liming ZHOU, Enze WANG. Finite Element Analysis of Residual Stresses on Y-TZP/ LZAS Glass-ceramic Gradient Coatings[J]. Chinese Journal of Materials Research, 2014, 28(10): 787-793.

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摘要:

设计了Y-TZP/LZAS微晶玻璃功能梯度涂层, 使用有限元软件分析了成分分布指数、梯度层数目和梯度层厚度等参数对涂层/基体界面残余热应力的影响。结果表明: 功能梯度材料的最佳成分梯度指数为m＝1; 涂层最佳层数为3-5层; 涂层最佳厚度为1-1.5 mm; 涂层表层主要分布为径向压应力; 在涂层/基体界面的边缘区域应力集中较为严重; 涂层/基体界面处的径向应力、轴向应力和剪切应力与成分分布指数、梯度层数目和梯度层厚度有密切的关系。用涂搪法制备了梯度涂层, 用X射线衍射法(XRD)测试了涂层表面残余应力, 验证了有限元结果的准确性。

关键词 ：材料表面与界面, 微晶玻璃, 有限元分析, 功能梯度涂层, 残余热应力

Abstract：

Y-TZP/ LZAS glass-ceramic gradient coatings on Q235 steel substrate were designed. The effects of compositional exponent, the number of graded layers and coating thickness on the residual stress were analyzed by using finite element software. The results show that the optimal coating could be obtain corresponding to the following parameters: the compositional gradient exponent m＝1, the number of graded layers= 3-5 and the coating thickness=1.0-1.5 mm. The radial compressive stress distributes on the surface of gradient coatings. There is clear stress concentration in the coating/substrate interface. The compositional exponent, layer numbers and the coating thickness have important influence on the radial stress, axial stress and shear stress in the coating/substrate interface. Y-TZP/ LZAS glass-ceramic gradient coatings were fabricated on Q235 steel substrate by slurry method. The residual stress of gradient coatings was measured by X-ray diffraction approach and the measurement results verified the reliability of the above simulation.

Key words： surface and interface in the materials glass ceramic finite element analysis gradient coating residual thermal stress

收稿日期: 2014-04-08

基金资助:* 四川省制造过程测试技术-省部共建教育部重点实验室13ZXK04和四川省科技计划2012FZ0020资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.196 或 https://www.cjmr.org/CN/Y2014/V28/I10/787

图1 有限元分析所用的几何模型

表1 Q235钢、微晶玻璃及3Y-TZP的物理性能参数

图2 3Y-TZP在梯度层中的体积分数

图3 组成分布指数m对梯度涂层残余热应力的影响

图4 梯度层数对残余应力的影响

图5 涂层的厚度对涂层复合材料残余应力的影响

图6 梯度涂层的残余应力分布云图

图7 计算结果与试验测量结果的比较

图8 涂层表面的压痕形貌

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