超音速等离子喷涂NiCr-Cr_3C_2工艺的参数优化  

Process Optimization of NiCr-Cr_3C_2 Coatings by Supersonic Plasma Spraying

作　　者：谢兆钱[1] 卢飞[1] 王海军[2] 张宇[1] 

机构地区：[1]西北核技术研究所,西安710024 [2]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：《表面技术》2011年第6期78-81,共4页Surface Technology

摘　　要：采用四因素三水平正交试验,通过在线监测喷涂粒子的温度和速度,对电流、电压、喷涂距离和主气流量四个超音速等离子喷涂的主要参数进行优化设计。结果表明:四个因素对喷涂粒子温度的影响均较大,电压和主气流量对喷涂粒子速度的影响较大;优化的工艺参数为电压150V、电流400A、喷涂距离85cm、氩气流量4.2m3/h,采用该优化工艺,喷涂粒子的平均速度为470m/s,平均温度为2 000℃,涂层结合强度为60MPa,显微硬度为884HV0.3,孔隙率为1.0%,750℃下的体积磨损率为4 793mm3/m。Using four factors three level orthogonal tests and watching the velocity and temperature of powder particle in supersonic plasma jet, four main process parameters of supersonic plasma spraying （current, voltage, spraying distance and the gas flows） were optimized. The results show that the four parameters have a large influence on temperature of particles. The factors influence of particles＇ velocity is flow of Ar and voltage. The optimization of NiCr-Cr3C2 is 150V（voltage）, 400 A（current）, 85 cm （the distance of spray）and 4.2 m3/h（flow of Ar）, the average of particles＇ velocity is 470 m/s,the temperature is 2 000℃, and the bonding strength, micro-rigidity and porosity of the coatings is 60 MPa, 884HV0.3 and 1.0% respectively. At 750 ~C ,the volume wear rate of NiCr-Cr3C2 coatings is 4 793 mm3/m.

关 键 词：超音速等离子喷涂 NiCr—Cr3C2涂层 工艺优化 喷涂粒子特性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]