摘要
镍铬碳化铬涂层坚硬致密,是非常理想的耐磨涂层。为了制备硬度较高的耐磨涂层,分别以Ni45和Ni60为过渡层,利用激光熔覆技术,在45钢基体上熔覆了25Ni Cr-75Cr3C2涂层。采用电子探针显微分析仪(EPMA)和其配备的能谱仪(EDS)对涂层的微观组织和微区成分进行了分析,并利用显微硬度仪进行了显微硬度的测试。结果表明:以镍基合金为过渡层,在45钢基体上熔覆25Ni Cr-75Cr3C2涂层,可以得到与基体结合紧密的涂层组织,且涂层硬度明显高于基体硬度;与过渡层Ni45相比,以Ni60为过渡层时,25Ni Cr-75Cr3C2涂层的硬度更高;不同过渡层上熔覆的25Ni Cr-75Cr3C2涂层微观组织结构及元素成分也不相同。
NiCr-Cr3 C2 is an ideal wear resistant coating due to its hard and compact characteristics.With the transition layers of Ni45 and Ni60 respectively,25NiCr-75Cr3 C2 is coated on the 45 steel substrate by laser cladding technology to prepare great hard wear resistant coatings.The micro structure and components of the coatings are observed and an-alyzed respectively through electron probe micro analyzer (EPMA)and energy dispersive spectrometer (EDS).And the micro hardness is measured.Test results show that the 25NiCr-75Cr3 C2 coating has good metallurgical bonding with the substrate with transition layer of nickel based alloy;the hardness of the coatings is significantly higher than that of the substrate.Compared with Ni45 /25NiCr-75Cr3 C2 coating,the Ni60 /25NiCr-75Cr3 C2 coating has higher hardness;with different transition layers,the micro structure and components of 25NiCr-75Cr3 C2 coatings are different.
出处
《激光与红外》
CAS
CSCD
北大核心
2015年第8期897-901,共5页
Laser & Infrared
基金
装备预研基金重点项目(No.9140A18020113HK01051)资助
关键词
激光技术
激光熔覆
镍铬碳化铬涂层
镍基过渡层
显微硬度
laser technology
laser cladding
NiCr-Cr3 C2 coating
nickel based transition layer
micro hardness