Q235钢基表面超音速电弧喷涂WC-Co涂层冲蚀磨损性能研究  

Study on Erosion Wear Properties of High Velocity Arc-sprayed WC-Co Coating on Sudstrate of Steel Q235

作　　者：孙国栋[1] 刘长华[1] 

机构地区：[1]九江学院机械与材料工程学院,江西九江332005

出　　处：《热加工工艺》2014年第20期123-124,共2页Hot Working Technology

摘　　要：采用超音速电弧喷涂工艺(HVAS)在A3钢基体上制备了WC-Co涂层,对所制备的涂层在不同冲蚀角度下的冲蚀磨损性能进行了研究。结果表明:冲蚀磨损时,喷涂电流为100 A和200 A的涂层质量损失都随冲蚀角的增大而增加,冲蚀角为30°时磨损量最小,冲蚀角为90°时磨损量最大,说明冲蚀过程中冲蚀粒子的锤击作用对材料的质量损失影响更大。喷涂电流为100 A时的冲蚀磨损量要高于喷涂电流为200 A的冲蚀磨损量,喷涂电流增大,弧区温度升高,容易形成细小熔滴,在压缩空气作用下粒子飞行速度增大,动能提高,促使涂层表层硬度提高,从而提高了涂层的耐磨性。The WC-Co coating was sprayed onto the substrate of steel Q235 by high velocity arc sprayed （HVAS）. The erosion wear properties of the coating were discussed under the 30°, 60° and 90° impingement angles. The results show that the mass loss of the coating increases at both spraying current 100 A and 200A, while the impingement angle raises. The mass loss is the least at impingement angle of 30°, the mass loss is the most at impingement angle of 90°. It indicates that the hammering effect of erosion particles is much stronger to the coating mass loss. The erosion mass loss at the spray current 100 A is much higher than that of 200 A. When the spraying current increases and, arc temperature heightens, it is easy to form small droplets, these droplets can accelerate the initial flight speed of the particles under the compressed air, and the kinetic energy of the particles greatly increases, the result is that the surface hardness of the coating increases, thereby, the wear resistance of the coating enhances.

关 键 词：超音速电弧喷涂 WC-CO涂层 冲蚀角 

分 类 号：TG174[金属学及工艺—金属表面处理]