铜合金表面添加SiC晶须的Ni-Cu激光熔覆层  

Preparation of SiC Whiskers Pre-added Ni-based Cladding on Cu Alloy Surface by Laser Deposition

作　　者：董江[1] 刘芳[2] 陈岁元[1] 刘常升[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004 [2]大连交通大学材料学院,辽宁大连116028

出　　处：《东北大学学报（自然科学版）》2009年第1期79-82,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金与上海宝钢集团联合资助项目(50574020);国家自然科学基金资助项目(50274028)

摘　　要：用5 kW CO2激光器,通过优化激光工艺参数,在结晶器用铜合金表面预置添加SiC晶须的镍基自熔合金(Ni1015)粉,制备出表面平整、组织均匀致密、无气孔和裂纹等缺陷、与基体为冶金结合的Ni-Cu激光熔覆层.借助OM,SEM和显微硬度计等分析测定了涂层的显微组织形貌、组织成分和截面显微硬度.结果表明:添加SiC晶须的Ni-Cu涂层比单纯的Ni-Cu涂层的显微组织明显得到细化,涂层的显微硬度高出150HV左右,是铜合金基体(85 HV)的3.7倍,从而能够提高结晶器的使用性能.To prepare the SiC whiskers pre-added wear-resistant Ni-based cladding on copper alloy substrate for mold making, a 5 kW continuous wave CO2 laser was used with the deposition process parameters optimized. A Ni-Cu based cladding was thus deposited, where the powdered Ni1015 was provided for the laser cladding process to form a smooth surface layer bonded metallurgically with Cu suhstrate, whose grain-refining microstructure is homogeneous, compact, void-free and crack-free. Tested hy OM, SEM and micro Vickers, the results showed that the layer＇ s average microhardness is 150 HV higher than no-SiC cladding, about 3.7 times as high as that of Cu substrate （85 HV）. Thus, the properties of the mold made from such a Cu alloy can be greatly improved when used in continuous casting.

关 键 词：铜 CO2激光器 Ni-Cu激光熔覆层 SIC晶须 

分 类 号：TG142[一般工业技术—材料科学与工程]