摘要
以Ni60A合金粉末和MoS_(2)粉末为熔覆材料,采用激光熔覆技术在35CrMnSi钢基体表面制备MoS_(2)/Ni60A固体自润滑涂层,研究了MoS_(2)添加量(质量分数1%,3%,5%,7%,9%)对涂层物相组成、显微组织、显微硬度和摩擦磨损性能的影响。结果表明:不同MoS_(2)添加量的涂层表面成形良好,均与基体达到冶金结合,涂层主要物相组成为MoS_(2)、γ-Ni、NiS、Cr_(2)B,其中,上部显微组织主要由短棒状、鱼骨状和放射状的树枝晶组成,底部与熔合线处的组织由平面晶和粒状晶组成。随着MoS_(2)添加量的增加,涂层的显微硬度降低,磨损质量损失增多,摩擦因数先降低后增大。当MoS_(2)添加量为3%时,涂层的摩擦因数最小,为0.43,磨损表面形成完整的固体自润滑膜,产生的犁沟较少,主要磨损机理为轻微的磨粒磨损。
MoS_(2)/Ni60A solid self-lubricating coating was prepared on 35CrMnSi steel substrate by laser cladding with Ni60A alloy powder and MoS_(2) powder as cladding materials. The effects of MoS_(2)addition amount(mass fraction of 1%, 3%, 5%, 7%, 9%) on the phase composition, microstructure, microhardness and tribological properties of the coating were investigated. The results show that the coatings with different MoS_(2) addition had good surface formability and were metallurgical by bonded with the substrate. The main phase of the coatings were MoS_(2), γ-Ni, NiS, Cr_(2)B. The microstructure of middle and upper position was mainly composed of rod-shaped, fishbone-shaped and radial dendrite. The microstructure of the bottom and fusion line was composed of planar and columnar crystals. With the increase of MoS_(2) addition, the microhardness of the coating decreased and the wear rate increased, and the friction coefficient decreased first and then increased. When the addition of MoS_(2) was 3%, the friction coefficient of the coating reached the lowest of 0.43, and a complete solid self-lubricating film was formed on the worn surface;The plough furrow was less and the main wear mechanism was slight abrasive wear.
作者
张宇鹏
王永东
常萌阳
王金宇
ZHANG Yupeng;WANG Yongdong;CHANG Mengyang;WANG Jinyu(School of Materials Science&Engineering,Heilongjiang University of Science&.Technology,Harbin 150022,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2022年第12期24-29,35,共7页
Materials For Mechanical Engineering
基金
黑龙江省教育厅基本业务费资助项目(2020-KYYWF-0699)
哈尔滨市科技创新人才资助项目(2017RAQXJ010)
研究生创新科研资金资助项目(YJSCX2021-103HKD)。
