摘要
利用500WYAG固体激光器在紫铜表面原位合成TiB2/Cu复合涂层,用扫描电镜分析了复合涂层的组织形貌以及熔覆层和基底之间的结合界面,测试了复合涂层的显微硬度和磨损性能。结果表明,采用激光熔覆表面改性技术可在紫铜表面合成厚度为100μm的TiB2/Cu复合涂层;涂层与铜基底形成了较好的冶金结合;TiB2分布均匀、颗粒细小,颗粒尺寸约为300～500nm;熔覆层显微硬度最高达380HV,平均硬度约240HV,是铜基底的3～4倍;TiB2/Cu复合涂层耐磨性能为紫铜的5～8倍。
TiB2/Ou composite coating was successfully in-silo synthesized on the red copper substrate using a 500 W YAG laser. The structure morphology of the composite coating and the bonding interface between the laser cladding layer and the substrate were studied using SEM. The microhardness and the wear resistance were tested respectively. The results show that the thickness of TiB2/Ou composite coating is about 100 μm, where the distribution of TiB2 particles are uniform and the dimension of TiB2 phase is finer, which is about 300-500nm. The bonding interface between the laser cladding layer and the substrate has good metallurgical bonding. The highest microhardness of the laser cladding layer reaches 380 HV, and the average value is about 240 HV which is 3 - 4 times higher than that of red copper substrate. The wear resistance of TiB2/Cu composite coating is 5-8 times larger than that of the copper substrate.
出处
《铸造技术》
CAS
北大核心
2007年第6期859-861,共3页
Foundry Technology
关键词
激光熔覆
连铸结晶器
原位合成
显微硬度
耐磨性能
Laser surface modification
Continous crstallerlazer
In-silo synthesizing
Microhardness
Wear resistance
