离心式压缩机叶片热喷涂修复层结合强度研究  

Study on Bond Strength of Thermal Spray Repair Layer in Centrifugal Compressor Blades

作　　者：金湖 李方义[1,2] 李法双 王黎明[1,2] 

机构地区：[1]山东大学高效洁净机械制造教育部重点实验室 [2]山东大学

出　　处：《工具技术》2015年第11期10-13,共4页Tool Engineering

基　　金：国家重点基础研究发展计划资助项目(2011CB013401);国家863计划资助项目(2013AA040204)

摘　　要：利用胶结拉伸试验法测定了不同工艺参数下涂层的结合强度。由于热喷涂涂层与基体的结合主要以机械结合为主,基体的表面形貌对于结合强度有直接的影响。该表面的单位表面积增加时,液滴与基体之间机械结合概率变大,液滴更易粘附在基体表面,增强涂层的结合强度。合适的预热温度有利于液滴在基体表面平坦展开,从而使液滴可以与基板充分接触,弱结合区域变小,结合强度提高。另外喷涂距离通过影响液滴到达基体表面的速度与质量也对涂层的结合强度有着重要影响。Bonding strength was measured by tensile test under different process parameters. Due to the combination of thermal spray coating and the substrate mainly dominated by mechanical binding, the surface morphology of the substrate has a direct impact on the binding strength. When the surface area unit increases, there are more liquid droplets adhering to the substrate surface so that the droplet and the substrate would meet with a larger probability to enhance binding strength of the coating. Suitable preheating temperatures is beneficial for the droplet to expand on the substrate surface, so that the droplets can be sufficiently in contact with the substrate, the weak binding region becomes small to improve the bonding strength. Besides, spraying distance also has an important impact on binding strength by affecting the speed and the tem- perature of the droplets.

关 键 词：预热温度 表面形貌 喷涂距离 结合强度 

分 类 号：TG17[金属学及工艺—金属表面处理]