Cr的添加对WC_p/铁基表层复合材料三体磨料磨损性能的影响  

Effects of Cr addition on three-body abrasive wear behavior of WC particles reinforced iron substrate surface composites

作　　者：李祖来[1] 蒋业华[1] 周荣[1] 陈志辉[1] 山泉[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《材料热处理学报》2014年第1期17-21,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51241002;51361019)

摘　　要：采用真空实型铸渗(V-EPC)工艺制备碳化钨颗粒增强铁基表层复合材料,观察并研究其基体组织和抗三体磨料磨损性能。结果表明,基体组织的变化对复合材料的磨损性能产生显著的影响,随着Cr含量的增大,复合材料基体组织中的碳化物含量增加,形貌由长条状向块状转变。而复合材料的三体磨料磨损性能随着Cr含量的增大呈增加趋势,与未添加Cr的表层复合材料相比,当基体中Cr含量为27.4%时,表层复合材料的三体磨料磨损性能提高了40.6%。Cr的添加可提高WC p/铁基表层复合材料三体磨料磨损性能的机制为双"阴影效应"和"支撑效应"的协同作用。Tungsten carbide particles （WCp） reinforced iron matrix surface composites on gray cast iron substrate were fabricated by vacuum evaporative pattern casting （V-EPC） infiltrating method. The effects of Cr contents in the matrices on the three-body abrasive wear resistance of the composites were investigated. The results show that the changes of the matrices can make a remarkable effect on abrasive wear resistance of the composites. With the increase in Cr content, the morphology of carbides in the matrices changes from strip to lump, and the amount of carbides and the wear resistance of the composites increases. Compared with the surface composites without Cr addition in the matrix, the three-body abrasive wear resistance of the composite with 27.4% Cr addition in the matrix has a 40. 6% improvement. The influences of Cr content in the matrices on the abrasive wear resistance are ascribed to the synergistic effects of two protecting effects and a supporting effect.

关 键 词：颗粒增强复合材料 磨料磨损 真空实型铸造 基体组织 

分 类 号：TB333[一般工业技术—材料科学与工程]