摘要
钢基铝层经等离子体电解氧化技术陶瓷化后,可在钢表面形成多层体系结构的陶瓷涂层．采用有限元方法,对不同厚度配比的复合涂层在均布接触载荷作用下的应力分布进行了研究．结果表明:铝层的存在可明显缓解界面处的剪应力．同时,铝层厚度增加,也使表面拉应力增大; Al2O3层决定着涂层内最大剪应力距离表面的距离。增强了涂层表面支撑能力．可减缓表面拉应力值．特别．当Al2O3层与Al层的厚度相等时,Al2O3／Al界面处的剪应力最小;FeAl层对表面应力和界面应力影响较小．因此,当选择较厚陶瓷层和较薄铝层时,涂层内将具有较优的表面和界面应力分布状态,从而可提高涂层力学性能．
Multilayer ceramic coatings were formed on aluminized steel by plasma electrolytic oxidation technology. The effect of thickness-ratio on the stress field of multilayer coatings subjected to uniform normal contact load was investigated by using finite element method (FEM). As a result, interfacial stress is obviously reduced by Al layer. Meanwhile, with thickness of Al layer increasing, surface tensile stress also increases. Al2O3 layer is the main factor that affects the location of maximal shear stress within coatings. Moreover, thicker Al2O3 layer improves the coating supporting performance and lessens tensile stress at the surface. Especially, shear stress at the Al2O3/A1 interface is minimal as Al2O3 layer and Al layer have the same thickness-ratio. Surface and interfacial stresses are slightly affected by FeAl layer. Therefore, when choosing thick ceramic layer and thin Al layer, there are appropriate stress distributions at surface and interfaces, and the mechanical properties of coatings can be strengthened.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2006年第z1期60-65,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(10572141).
关键词
厚度配比
多层涂层
界面应力
有限元方法
thickness-ratio
multilayer coating
interfacial stress
finite element method
