等离子喷涂送粉参量对粉末粒子运动行为的影响分析  

Influence of Plasma-spraying Powder Feed Parameters on the Motive Behavior of Powder

作　　者：王赫莹[1] 李德元[1] 吴卫枫[1] 

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110023

出　　处：《表面技术》2005年第5期40-42,共3页Surface Technology

基　　金：辽宁省教委基金项目(990521043)

摘　　要：为研究等离子喷涂设备送粉参量变化对粉末粒子运动行为的影响,通过数学计算给出了粉末粒子初速度及运行轨迹的一些解析计算结果。结果表明粉末粒子喷出初速度随送粉气流量的增大呈线性增大,随送粉管直径增大呈指数减小,而且与密度和粒径的指数幂成反比关系。当粉末粒子粒径为75μm时,N i金属粉末的最佳送粉参量为:送粉气流量0.2m3/h,送粉管直径1.5mm;A l2O3陶瓷粉末最佳送粉参量为:送粉气流量0.3m3/h,送粉管直径1mm。该项研究工作为选择最佳送粉参量和控制粉末粒子在等离子流场中的运动提供了依据。In order to study the effects of the plasma spraying parameters on the motive behavior of particles, the initial velocity and the motive trace of the particles have been analyzed by the way of the mathematic calculation. It has been found that the initial velocity of the powder particles rises proportionally with the increasing of the gas flux and reduces with the diminishment of diameter of feed pipe, and the velocity of the powder particles is in inverse proportion to the density and diameter of powder particles. When the diameter of powder particles is 75μm, the optimum powder feed parameters for Ni powder are followings ： the feeding gas flux is about 0. 2m^3/h, the diameter of feed pipe is 1.5mm, and the optimum parameters for Al2O3 powder are that the feeding gas flux is about 0. 3m^3/ h, the diameter of feed pipe is I ram. This study can found a theory foundation in selecting optimal powder feed parameters as well as controlling the moving trace of powder particles in plasma field.

关 键 词：等离子喷涂 送粉参量 粉末粒子 运动行为 

分 类 号：TG174.442[金属学及工艺—金属表面处理]