激光熔覆Fe_p/Cu复合涂层组织特征及其形成机理研究

Study on microstructure and its formation mechanism of Fe p/Cu composite coatings produced by laser cladding

利用２ｋＷ的ＣＯ２气体激光器在Ｑ２３５钢表面熔覆Ｃｕ＋５％Ａｌ混合粉末，获得了外观质量良好的熔覆层。ＳＥＭ观察发现，熔覆层中有圆形颗粒存在，且有规律分布。成分分析表明，颗粒为富Ｆｅ相。提出一个激光熔覆模型对颗粒形成过程进行了解释。

Using a 2kW CO 2 laser to irradiate the mixture of Cu and Al (5% in weight fraction) powders on Q235 mild steel substrate the composite coatings of Fe/Cu has been successfully produced.The microstructure observations with SEM show that the spherical particles exist in the cladding layer and have regular distribution and are proved to be Fe rich phase particles.These particles have the important effect on the mechanical and electrical magnetic performances of the cladding layer.This paper points out that the formation procedure of the particles has the relation with the fogging process of metal and formulates an expression to calculate the diameter of the particles.