摘要
通过分子动力学方法模拟了基体表面形貌对热喷涂的影响。研究了柱状粗糙表面和光滑表面对团簇展平、基体缺陷演化、应力分布、涂层与基体结合强度的影响。结果表明,基体表面形貌对热喷涂结合强度影响显著,粗糙表面不仅增加了团簇与基体的实际接触面积,提高了附着力,而且在界面结合处形成锚固效应,从而提高了界面结合强度。同时,基体表面形貌改变了界面区域的应力分布,柱状粗糙表面可以减小应力集中效应,降低临界应力,减轻对基体的损伤。此外,粗糙表面会阻碍团簇的滑移,减小了展平比。
The molecular dynamics method was applied to simulate the effects of substrate surface morphology on nano-thermal spraying.The effects of columnar rough surface and smooth surface on cluster flattening,defect evolution of substrate,stress distribution,and the bonding strength between coating and substrate were investigated.The results show that the substrate surface morphology has a significant effect on the bonding strength of thermal spraying.The rough surface increases the actual contact area between the clusters and the matrix,improves the adhesion,causes the anchorage effect at the interface,and thereby enhances the bonding strength.In addition,the substrate surface morphology can change the stress distribution in the interface region.The columnar rough surface on the matrix weakens the stress concentration effect,decreases the critical stress,and reduces the damage to the substrate.Besides,the rough surface hinders the cluster slip and reduces the flattening ratio.
作者
雷春丽
董建勇
杨晟泽
曹卉
张隽
李海燕
冯瑞成
Lei Chunli;Dong Jianyong;Yang Shengze;Cao Hui;Zhang Jun;Li Haiyan;Feng Ruicheng(School of Mechanical and Electronical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Digital Manufacturing Technology and Application,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期881-887,共7页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(52065036)
Natural Science Foundation of Gansu Province(20JR5RA448)
Hongliu First-Class Disciplines Development Program of Lanzhou University of Technology。
关键词
热喷涂
粗糙表面
空位
结合强度
分子动力学
thermal spraying
rough surface
vacancy
bonding strength
molecular dynamics
