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。
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.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2014年第10期787-793,共7页
Chinese Journal of Materials Research
基金
四川省制造过程测试技术-省部共建教育部重点实验室13ZXK04
四川省科技计划2012FZ0020资助项目~~
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
surface and interface in the materials,glass ceramic,finite element analysis,gradient coating,residual thermal stress
