【摘要】 以MoS₂、TiC、Ni粉为原料,在20钢基材表面利用激光熔覆技术制备了减摩耐磨复合涂层。采用SEM和XRD对复合涂层的组织和相组成进行了研究,结果表明复合涂层主要由部分未熔的TiC颗粒、Mo₂C、γ镍基固溶体和多种两元、三元硫化物TiS、NiS、Ni₃Ti₄S₈等组成。用FALEX-6摩擦磨损实验机对MoS₂/TiC/Ni复合涂层、MoS₂/Ni激光熔覆层以及45钢的耐磨性能进行了对比,并对三种试样表面的磨损形貌进行了SEM观察。实验表明:MoS₂/Ni激光熔覆层具有最低的摩擦系数,但磨损失重最大;MoS₂/TiC/Ni复合涂层在载荷17.8N、转速200r/min条件下,磨损40分钟,其磨损失重仅为45钢的1/6。更多还原

【Abstract】 Using mixture of 80%Ni-coated MoS₂,TiC and pure Ni powder as prepared layer,new typical wear resistance and antiffiction coating formed on the low carbon steel by laser cladding process.Microstructure and phase structure of the composite coating were studied by SEM and XRD.The typical microstructure of composite coating is composed of multi-sulfide phases including binary element sulfide and ternary element sulfide,γ-Ni,TiC and Mo₂C.Wear tests were carded out using a FALEX-6 type pin-on-disc machine.MoS₂/Ni laser cladding coating exhibited the lowest of friction coefficient and the largest of weight loss in comparison to other experimental materials.The weight loss of MoS₂/TiC/Ni laser cladding coating is only one sixth of that of 45 steel and worn surface of MOSE/TiC/Ni laser cladding coating is so smooth that the microstructure of coating is identified after dry wear test 40 minute更多还原