氧化物陶瓷颗粒对铜基熔覆层组织演变及性能的影响

Effect of Oxide Ceramic Particles on Microstructure Evolution and Properties of Copper based Cladding Layer

为了提高铜基熔覆层的硬度以及耐磨性能,向药芯焊丝中添加不同成分比例的氧化物陶瓷颗粒并采用TIG熔覆方法制备了Cu基熔覆层,利用OM、SEM、EDS、XRD和显微硬度测试等方法,研究了不同成分比例的氧化物陶瓷颗粒对铜基熔覆层的组织及性能的影响。研究发现,随着Al_(2)O_(3)/TiO_(2)的降低,合金液的流动性有所提高,从而释放了部分的残余应力,并且Cu (311)逐渐转变为Cu (200)峰,促进了铜基熔覆层顶部的晶粒细化,同时向铜侧扩散的铁数量逐渐减少,界面处的树枝晶也产生了明显细化,并且三种熔覆层界面处硬度过渡平缓,熔覆顶部的硬度随着TiO_(2)的增加逐渐升高;在3#熔覆层顶部出现了Al13Fe4金属间化合物,提高熔覆层的表面性能;磨擦磨损结果中磨损量随着TiO_(2)的增加,磨损量也逐渐降低,但明显细化晶粒的3#熔覆层摩擦系数保持稳定,有较少的犁沟效应。

In order to improve the hardness and wear resistance of the copper based cladding layer,oxide ceramic particles with different composition ratios were added to the flux cored welding wire and a Cu-based cladding layer was prepared by using TIG cladding method.The effects of oxide ceramic particles with different composition ratios on the microstructure and properties of the copper based cladding layer were studied by using methods like OM,SEM,EDS,XRD,and microhardness testing.Research has found that as Al_(2)O_(3)/TiO_(2) decreases,the fluidity of the alloy liquid also improves,releasing residual stress,gradually transforming Cu(311)into Cu(200)peak,and promoting grain refinement at the top of the copper based cladding layer.At the same time,the amount of iron diffused towards the copper side gradually decreases,and the dendrites at the interface also show significant refinement.The hardness transition at the interfaces of the three cladding layers is smooth.The hardness of the top of the cladding gradually rises with the increase of TiO_(2).Al13Fe4 intermetallic compound appeared at the top of the 3#cladding layer,improving the surface properties of the cladding layer.In the friction and wear results,the wear amount gradually increases with the increase of TiO_(2),but the friction coefficient of the 3#cladding layer with significantly refined grains remains stable,with less furrowing effect.