热作模具的电火花涂层制备及性能研究  

Preparation and Properties of Electric Spark Coating for Hot-work Die

作　　者：刘峥[1] 林红[1] 陈峥[1] 

机构地区：[1]重庆工业职业技术学院,重庆401120

出　　处：《热加工工艺》2016年第4期117-119,122,共4页Hot Working Technology

摘　　要：以碳化钨硬质合金棒为电极材料,对4Cr5Mo Si V热作模具进行了电火花涂层制备,并对涂层进行了SEM和XRD分析以及磨损试验、热疲劳试验和高温氧化试验。结果表明,电火花涂层致密、无明显微裂纹,主要由Fe_3W_3C、(Cr Fe)_7C_3和W_2C组成。与未制备涂层的4Cr5MoSiV热作模具相比,明显提高模具的耐磨损性能、抗热疲劳性能和抗高温氧化性能,制备电火花涂层的模具在25℃的磨损体积减少85.06%,在500℃的磨损体积减少88.44%,高温氧化后的单位面积质量增加减少96.56%,热疲劳裂纹级别从10级变为3级。Electric spark coating on the surface of 4Cr5MoSiV hot-work die was prepared with WC cemented carbide alloy bar as electrode material, and the coating was analyzed by SEM and XRD, moreover, wear resistance, thermal fatigue and oxidation resistance at high-temperature were tested. The results show that the electric spark coating is compact and without micro-crack, which is mainly consisted of Fe3W3C, （CrFe）7C3 and W2C. In comparison with the sample without coating, electric spark coating can apparently improve the wear resistance, thermal fatigue and oxidation resistance at high-temperature, make wear volume at 25 ℃ decrease by 85.06%, make wear volume at 500 ℃ decrease by 88.44%%, make mass gain per unit area decrease by 96.56%, and make the grade of thermal fatigue change from 10 grade to 3 grade.

关 键 词：热作模具 电火花涂层 制备 性能 

分 类 号：TG174[金属学及工艺—金属表面处理]