摘要
为了提高铜合金表面的耐磨性能,通过激光熔覆技术在铜合金(Cu-Cr-Zr)表面制备铁钴梯度涂层,利用SEM、EDS、XRD、磨损试验机对熔覆层的显微形貌、物相组成、显微硬度和耐磨性能进行分析。结果表明,梯度熔覆层组织致密,无气孔裂纹等缺陷,工作层物相由γ-Co(面心立方)固溶体、Cr_(4)Ni_(15)W、Fe_(0.64)Ni_(0.36)、CoCx和Cr_(23)C_(6)等组成,显微硬度呈现梯度式变化,钴基熔覆层平均显微硬度HV_(0.2)417.3,较铜基体提高约3.76倍,耐磨性同显微硬度呈现正比例关系,粘着磨损大量减少,只有少量的微观切削,磨粒磨损减弱,熔覆层呈现较好的耐磨性。
In order to improve the surface wear resistance of the copper alloys,we prepared gradient coating on the surface of copper alloy(Cu-Cr-Zr)by laser cladding,and the microstructure,phase constituents,microhardness and wear resistance of the laser cladding layer were analyzed by SEM,EDS,XRD and wear testing.The experimental results indicated that the gradient cladding layer was dense and no cracks and porosity were obtained.The phase constituents of the Co-based cladding layer wasγ-Co,Cr_(4)Ni_(15)W,Fe_(0.64)Ni_(0.36),CoCx和Cr_(23)C_(6).The microhardness shows a gradient change and the average microhardness of the Co-based cladding layer is HV0.2417.3,which is about 3.76 times higher than that of the copper substrate.The wear resistance is proportional to the microhardness.The Co-based cladding layer shows good wear resistance with a small amount of micro-cutting.Compared with copper alloys,the adhesive wear is greatly reduced,and the abrasive wear is weakened.
作者
王志浩
苏科勇
杜学山
孙玉福
WANG Zhi-hao;SU Ke-yong;DU Xue-shan;SUN Yu-fu(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)
出处
《铸造》
CAS
北大核心
2022年第10期1216-1221,共6页
Foundry
关键词
铜结晶器
激光熔覆
梯度涂层
显微硬度
耐磨性能
copper crystallizer
laser cladding
gradient layer
microhardness
wear resistance
