| 引用本文: | 陈永雄， 胡尧强， 梁秀兵， 徐滨士.FeCrBSiNb粉芯丝材电弧喷涂的弧区动态行为[J].中国表面工程,2015,28(1):15~20 |
| CHEN Yongxiong, HU Yaoqiang, LIANG Xiubing, XU Binshi.Dynamic Behaviors in Arc Zone of FeCrBSiNb Cored Wire Arc Spraying[J].China Surface Engineering,2015,28(1):15~20 |
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| 摘要: |
| 电弧喷涂粉芯丝材是由金属外皮包覆金属或非金属的复合粉末组成，喷涂过程中在弧区发生冶金反应并雾化成熔滴，大量熔滴沉积在基体表面最终形成涂层。粉芯丝材的电弧喷涂是一个高度动态的传热传质过程，采用高速摄像技术研究了喷涂过程中两根粉芯丝材交汇处的电弧、丝材熔化与熔滴形成等行为。另外，通过高速摄像试验分析了喷涂电流和电压对电弧形态及丝材熔化的影响规律。结果表明：喷涂时间歇出现燃弧、熄弧、再燃弧的循环变化；不同于实心丝材，粉芯丝材在阴阳极上的电弧都发散，这有利于丝材外皮和粉芯间的冶金反应；阴极丝材主要表现为抽吸作用下以细小熔滴或片状挤出物等形式形成熔滴，阳极丝材主要以片状液带的形式脱离并雾化成小熔滴。 |
| 关键词: 电弧喷涂 粉芯丝材 高速摄像 丝材熔化 熔滴雾化 |
| DOI：10.11933/j.issn.1007-9289.2015.01.003 |
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| Dynamic Behaviors in Arc Zone of FeCrBSiNb Cored Wire Arc Spraying |
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CHEN Yongxiong, HU Yaoqiang, LIANG Xiubing, XU Binshi
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a. National Engineering Research Center for Mechanical Product Remanufacturing, b. Science and Technology on Remanufacturing Laboratory, Academy of Armored Forces Engineering, Beijing 100072
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| Abstract: |
| The arc sprayed cored wire is composed of metal strip and the coated metal or nonmetal composite powders. During the arc spraying, metallurgical actions happens in the arc zone for the cored wires, atomized droplets are generated and the coating is formed consequently. Considering the highly dynamic heat and mass transfer feature for the cored wire arc spraying process, this paper investigates the behaviors such as the arc formed between the two cored wires, material melting and atomization use a high speed camera method. Additionally, the effect of spraying current and voltage on the arc profile and wire melting behavior was investigated using the high speed camera. The results show that the spraying process is featured with a circulation of arc burning, extinguish and burning again. The arc attached on the cathode and the the anode is divergent, which is quite different from the solid wire spraying. More importantly, the divergent arc distribution is useful for the metallurgical actions between the strip and composite powders. For the cathode cored wire, the formation of droplets is mainly featured with little droplets and splats aspiration, while for the anode, the droplets are mainly formed by the melted material gathering and detachment. |
| Key words: arc spraying cored wire high speed camera wire melting droplet atomization |
