超音速等离子喷涂工艺参数对Cr_2O_3涂层硬度的影响  

Influences of the Supersonic Plasma Spraying Process on the Hardness Properties of Cr_2O_3 Coating

作　　者：欧献[1,2] 邓畅光[1] 王日初[2] 毛杰[1] 

机构地区：[1]广州有色金属研究院,广州510651 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《表面技术》2014年第1期81-85,102,共6页Surface Technology

基　　金：科技部国际合作与交流专项(2011DFD50030)~~

摘　　要：目的研究影响超音速等离子喷涂Cr2O3涂层硬度的主要因素,制备出高硬度涂层。方法首先采用单变量法研究超音速等离子生成气体压力(空气压力)和喷涂距离对涂层显微结构的影响,然后采用正交试验研究喷涂电流、空气压力、喷涂距离对Cr2O3涂层硬度的影响。结果工艺参数对Cr2O3涂层硬度影响的主次顺序为:空气压力>喷涂电流>喷涂距离。结论获得高硬度涂层的最佳工艺参数组合为:空气压力0.4 MPa,喷涂电流270 A,喷涂距离200 mm。在该工艺条件下获得的涂层致密、均匀,孔隙率小。Objective To prepare coating with high hardness, this paper studied the main factors influencing the hardness ofCr2O3 coating. Methods The influences of spraying distance and air pressure on the coating microstructure were studied by single variable method, and then the effects of three factors including spraying current, air pressure and spray distance on the hardness ofCr2O3coating were investigated with orthogonal experiments. Results The results showed that the primary and secondary order of the Cr2O3 coating hardness by technical parameters was： air pressure, spray current, and then spraying distance. Conclusion The optimal combination of process parameters for high hardness coating was ： air pressure 0.4 MPa, spraying current 270 A, spraying distance 200 mm. The coating was dense, uniform and with low porosity.

关 键 词：超音速等离子喷涂 CR2O3涂层 正交试验 显微硬度 显微结构 

分 类 号：TG174.442[金属学及工艺—金属表面处理]