采用HVAF与HVOF工艺制备的NiCr-25%Cr_3C_2涂层的结构和性能表征  

Microstructural and properties of NiCr-25%Cr_3C_2 coating prepared by HVAF and HVOF process

作　　者：王枫[1] 朱晖朝[1] 陈志坤[1] 邓春明[1] 

机构地区：[1]广州有色金属研究院,广东广州510650

出　　处：《材料研究与应用》2010年第3期202-206,共5页Materials Research and Application

摘　　要：分别采用HVAF和HVOF工艺制备了NiCr-25%Cr3C2涂层,对两种方法所制备的涂层的显微组织、硬度、孔隙率及摩擦磨损性能进行了表征.从涂层的微观结构和磨损机理方面分析了两种涂层的耐磨损性能不同的原因.研究结果表明,与HVAF涂层相比,HVOF喷涂时由于火焰温度和焰流速度较高,制备的NiCr-25%Cr3C2涂层更均匀和致密,孔隙率和表面粗糙度较低,硬度更高.HVAF涂层中碳化铬的剥落与犁沟均较明显,耐磨性能较差.In this paper,NiCr-25%Cr3C2 coatings were prepared by high velocity air fuel（HVAF） and high velocity oxy fuel（HVAF） process respectively.The microstructure,hardness,porosity and wear resistance for both NiCr-25%Cr3C2 coatings were investigated,and the different wear resistance for the coatings was explored from microstructural observation and wear mechanism.The result showed that the relatively higher temperature and higher particle velocity for HVOF process than HVAF process led to more effective melting of NiCr adhesive phase,better uniform microstructure,lower porosity and surface roughness and finally higher microhardness.HVAF NiCr-25%Cr3C2 coating exhibited worse wear resistance due to the delamination of Cr3C2 hard phase and deeper wear scar.

关 键 词：HVAF HVOF NiCr-Cr3C2 耐磨性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]