冲击速度和磨粒粒度对FeCrAl/WC复合涂层冲蚀性能的影响  

Influence of Impact Velocity and Particle Size on Erosion-Wear Behavior of Arc-Sprayed FeCrAl/WC Composite Coating at Elevated Temperature

作　　者：胡军志[1] 马世宁[1] 陈学荣[1] 朱子新[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《摩擦学学报》2004年第6期503-507,共5页Tribology

基　　金：国家自然科学基金资助项目(50005024).

摘　　要：采用粉芯丝材作为原料,利用高速电弧喷涂技术制备了具有良好抗高温冲蚀磨损性能的FeCrAl/WC复合涂层;考察了650℃下冲击速度和磨粒粒度对复合涂层高温冲蚀磨损性能的影响.结果表明,复合涂层和20G锅炉钢的耐高温冲蚀磨损能力随着磨粒粒度的增加而有所提高;30°攻角下冲蚀率随磨粒粒度的变化速率比90°攻角下的小;同20G锅炉钢相比,复合涂层对速更加敏感,速度越低,FeCrAl/WC复合涂层的抗冲蚀磨损性能越好.FeCrAl/WC composite coating was produced on 20G boiler steel making use of high-speed arc spraying, so as to decrease the erosion-wear of the boiler tube of pulverized coal fired power station in the presence of high temperature flue gas and fly ash mixture. Thus the erosion-wear behavior of the composite coating at an elevated temperature of 650°C was compared to that of the 20 G boiler steel, with the effect of the particle size and impact velocities on the erosive wear of the FeCrAl/WC composite coating to be highlighted. The structure and phase composition of the composite coating were analyzed by means of scanning electron microscopy and X-ray diffraction, and the hardness and mechanical strength of the composite coating were also examined. It was found that the erosive rate of the coating and 20 G steel increased with increasing particle size. Both the composite coating and steel assumes a smaller change in the erosive rate at an impact angle of 30° than at 90°. Moreover, the composite coating was more sensitive to the impact velocity than the 20G steel. In terms of the relatively smaller impact velocity of the flue gas and fly ash mixture in the coal-fired power station, the composite coating developed would have excellent erosive-wear resistance in the related engineering applications.

关 键 词：电弧喷涂 复合涂层 高温冲蚀性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TH117.3[金属学及工艺—金属学]