• CN:11-2187/TH
  • ISSN:0577-6686

›› 2000, Vol. 36 ›› Issue (1): 36-40.

• 论文 • 上一篇    下一篇

高速电弧喷涂粒子速度和雾化特性研究

徐滨士;马世宁;刘世参;田保红;李诗卓   

  1. 装甲兵工程学院;中国科学院金属研究所
  • 发布日期:2000-01-15

PARTICLE VELOCITY AND ATOMIZING CHARACTERISTIC IN HIGH VELOCITY ARC SPRAY PROCESS

Xu Binshi;Ma Shining;Liu Shican;Tian Baohong;Li Shizhuo   

  1. Armored Force Engineering Institute Institute of Metal Research, Academia Sinica
  • Published:2000-01-15

摘要: 对比研究了高速电弧喷涂和普通电弧喷涂Al和3Cr13的粒子速度和雾化特性,用Pitot管总压法、双转盘法和扫描电镜、图象分析仪分别测定了喷枪出口雾化气流速度和粒子速度的轴向分布,以及不同工艺条件下雾化粒子的粒度分布。用Pearsonχ{sup}2分布拟合检验法对粒子的粒度分布进行统计分布检验。结果表明,高速电弧喷涂Al和3Cr13粒子的平均飞行速度为342m/s和388m/s;雾化粒子平均粒度分别为普通电弧喷涂地1/3和1/8;雾化气流轴向速度在主要雾化区间(d<100mm)为700~550m/s;高速电弧喷涂和普通电弧喷涂Al粒子的粒度具有相同的分布规律,而高速电弧喷涂3Cr13粒子的粒度却具有不同的分布规律。探讨了高速电弧喷涂雾化机理和影响粒子速度的因素。

关键词: 高速电弧喷涂, 粒度分布, 粒子速度, 雾化机理, 多面体夹芯结构, 吸能特性, 演变机理, 正则多面体体胞

Abstract: The particles velocity and atomizing characteristics of droplets in high velocity arc spray (HVAS) and regular arc spray processes are investigated respectively. Both atomizing gas flow velocity and particle flying velocity are measured by a dual rotating disk technique and pitot tube method respectively. The particle size distribution under various are sprayed processes is investigated by use of a scanning electron microscope and an image analyzer. Statistical tests for their particle size distributions are carried out according to Pearsonχ{sup}2 distribution test method. Results show that the axial gas flow velocity of HVAS fluctuated ranging from 550m/s to 700m/s at the primary atomizing zone, i. e. spray distance within 100 mm. The average particle velocities of high velocity are sprayed aluminum and chromium alloy steel reached 342m/s and 388m/s respectively, which are in excess of the local velocity of sound. Both HVAS and regular are sprayed aluminum’s particle size followed Poisson distribution. However high velocity arc sprayed chromium steel had different particle size distribution from that of regular arc. The influence factors on particle velocity and atomizing mechanism of HVAS process are also discussed on the basis of above experimental results and analyzing of gas flow velocity field.

Key words: Atomizing mechanism, High velocity arc spray, Particle size distribution, Particle velocity, energy-absorbing features, evolvement mechanism, polyhedron sandwich structure, regular polyhedron unit-cell

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