Arc voltage fluctuations: Comparison between two plasma torch types
Arc voltage fluctuations: Comparison between two plasma torch types
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DOI：
10.1016/j.surfcoat.2008.04.014
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发表时间：
2008-06
影响因子：
5.4
通讯作者：
E. Nogues;M. Vardelle;P. Fauchais;P. Granger
中科院分区：
文献类型：
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作者：
E. Nogues;M. Vardelle;P. Fauchais;P. Granger
在等离子喷涂工艺中，阳极壁处的弧根寿命是有限的，并且根据重起弧、接管或混合模式不断地产生新的弧根。它会导致频率在几千赫兹范围内的电压波动。这种现象通过粒子轨迹的波动以及相应的撞击时的速度和温度随时间的变化在喷雾过程中发挥着关键作用。对苏尔寿美科 PTF4 和普莱克斯等离子炬产生的 Ar-H2 等离子体进行了深入研究。然而，电弧运动取决于几个参数，例如等离子喷涂参数、等离子气体混合物成分、电极几何形状和等离子形成气体喷射器设计。在本文中，研究了两种使用氩-氢混合气体运行的商用等离子炬 PTF4 和 3MB。这项研究工作展示了几何效应和冷边界层厚度对电弧电压波动的影响，以及颗粒热处理和所得涂层性能。
In plasma spray process, the arc root lifetime at the anode wall is limited and new arc roots are continuously created according to restrike, takeover or mixed modes. It results in voltage fluctuations at frequencies in the few thousands hertz range. Such phenomena play a key role in the spray process through the fluctuations of particle trajectories and correspondingly their velocity and temperature time-variations at impact. They have been intensively studied for Ar–H2plasmas produced by Sulzer-Metco PTF4 and Praxair plasma torch. However, the arc movement depends on several parameters such as the plasma spray parameters, the plasma gas mixture composition, the electrode geometry and the plasma forming gas injector design. In this paper, two commercial plasma torches, PTF4 and 3MB, running both with argon–hydrogen gas mixtures, have been studied. This research work shows the geometry effect and the cold boundary layer thickness on the arc voltage fluctuations, as well as the particle thermal treatment and the resulting coating properties.