摘要
为提高铝合金的表面性能,利用激光熔覆技术在6061铝合金表面制备了添加稀土Ce O2的Ni60熔覆层,并通过金相显微镜、SEM、显微维氏硬度计和摩擦磨损试验机等设备研究了CeO2对Ni60熔覆层组织结构、硬度及摩擦磨损性能的影响.结果表明,加入2%的Ce O2可有效地减少熔覆层中的裂纹、孔洞和夹杂物,促进晶粒细化,提高熔覆层的组织均匀性、表面硬度及耐磨损性能;在相同磨粒磨损条件下,CeO2+Ni60熔覆层的耐磨性是铝合金的7.1倍,是Ni60熔覆层的1.6倍;Ni60熔覆层可以显著降低铝合金表面摩擦系数,而添加稀土CeO2能提高Ni60熔覆层的摩擦系数稳定性,从而改善Ce O2+Ni60熔覆层的耐磨性能.
To improve the surface properties of aluminum alloy,Ni60 alloy cladding layer containing rare earth Ce O2 were prepared on the surface of 6061 aluminum alloy by laser cladding. The effects of rare earth Ce O2 on the microstructure,microhardness and tribological properties of Ni60 alloys coatings were investigated by means of metalloscope,SEM,micro-hardness test,friction and wear test machine. The results show that the cracks,holes and inclusion in the coatings are reduced with the addition of 2% Ce O2,the grain becomes thin,the microstructure uniformity is improved,and the hardness and wear resistance of the coatings increases. Under the same abrasive wear conditions,the wear resistance of Ce O2+ Ni60 cladding layer is7. 1 times as that of untreated aluminum alloy,and 1. 6 times of Ni60 cladding layer. Ni60 cladding layer can significantly reduce the friction coefficient of aluminum alloy,and the Ce O2+ Ni60 cladding layer can improve the stability of friction coefficient and thus improve wear resistance. The stability of friction coefficient can be improved with the addition of Ce O2,thereby the wear resistance of Ce O2+ Ni60 cladding layer can be improved.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2015年第7期13-16,113-114,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金青年基金资助项目(51201043)
国家自然科学基金资助项目(51264007)
广西科学研究与技术开发科技攻关计划资助项目(桂科攻12118020-2-2-1)
广西信息材料重点实验室资助项目(桂科能1210908-07-Z)
广西信息材料重点实验室资助项目(1210908-214-Z)
关键词
激光熔覆
稀土
铝合金
摩擦磨损
laser cladding
rare earth
aluminum alloy
friction and wear behavior
