摘要
采用激光熔覆快速凝固技术,原位合成了Cop/Cu复合材料涂层,应用扫描电镜及能谱附件研究了激光工艺参数对涂层显微组织的影响。结果表明,激光熔池大的过冷度条件,有利于Cu-Co合金的液相分离。在优化的激光熔覆工艺条件下,可原位合成表面光滑、均匀连续的致密Cop/Cu复合涂层,涂层组织由大量细小的均匀分布在铜基固溶体基体上的富γ-Co球形颗粒组成。随着热输入的降低,颗粒相的尺寸得到细化。对Co/Cu复合涂层组织的形成和细化机理进行了分析。
Uniform Co p/Cu composite coatings were fabricated by laser cladding and rapid solidification technique, and the influences of processing parameters on microstructure were investigated by scanning electron microscope and energy dispersive spectroscopy. The results showed that high undercooling in the laser melting pool was helpful to the liquid phase separation of Cu-Co alloy. Co p/Cu composite coating with smooth surface can be successfully in situ synthesized when the processing conditions were well controlled. The as-solidified microstructures were characterized by a distribution of small spherical Co-rich particles homogeneously dispersed in the Cu-rich matrix. Co p/Cu coating was consisted of γ-Co and Cu-rich solution. With the decreasing of laser heat input, the diameters of spherical particles in coating decreased. The microstructural evolution and refining mechanism of the Co p/Cu coatings were also discussed.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第3期1-4,共4页
Transactions of The China Welding Institution
基金
安徽省教育厅自然科学研究项目(2002KJ058ZD)
安徽省十五科技攻关项目(04022004)
关键词
激光熔覆
液相分离
涂层
显微组织
laser cladding
liquid phase separation
coating
microstructure
