Influence of the Injector Head Geometry on the Particle Injection in Plasma Spraying
Influence of the Injector Head Geometry on the Particle Injection in Plasma Spraying
复制标题
喷射头几何形状对等离子喷涂颗粒喷射的影响
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
H. Heinemann
中科院分区：
文献类型：
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作者：
K. Bobzin;M. Öte;M. Knoch;H. Heinemann
在等离子喷涂中，喷嘴出口的颗粒速度对颗粒在等离子体射流中的穿透有重要影响。喷射器的几何形状和载气的流速决定了颗粒的速度。基于数值模拟，很明显，采用比标准喷嘴长得多的喷嘴几何形状可以实现更高的粒子速度，从而使粒子更深地穿透到等离子体射流中。这导致粒子的熔化程度更高，特别是对于导致高速等离子射流的操作参数。为了验证模拟结果，制造了不同直径和长度的喷油器，并通过粒子诊断测量了它们对喷油器出口颗粒速度的影响。此外，该喷射器还用于在多阴极等离子发生器上涂覆氧化铝涂层。确定了所得涂层的厚度。基于这些结果，通过增加喷射器长度对颗粒的喷射行为产生积极的影响似乎是可行的。通过比较X射线衍射谱中α-和γ-氧化铝峰的相对强度，发现喷嘴几何形状的这些变化并不影响相组成。
In plasma spraying, the particle velocity at the injector outlet has significant influence on the particles’ penetration into the plasma jet. The geometry of the injector and the flow rate of the carrier gas determine the particle velocities. Based on numerical simulations, it is evident that higher particle velocities and thus, a deeper penetration of the particles into the plasma jet, can be realized with an injector geometry which is significantly longer than the standard injector. This results in a higher melting degree of the particles, especially for operating parameters leading to high-speed plasma jets. In order to verify the results of the simulations, injectors with different diameters and lengths were manufactured and their influence on the particle velocities at the injector outlet was measured via particle diagnostics. The injectors were furthermore used to apply alumina coatings with a multi-cathode plasma generator. The resulting coating thicknesses were determined. Based on these results, it seems feasible to influence the injection behavior of the particles positively by increasing the injector length. By comparing the relative intensities of the α- and γ-alumina peaks in the XRD patterns, it is shown that these changes in injector geometry did not affect the phase composition.
影响因子：
3.1
作者：
K. Bobzin;M. Öte;J. Schein;S. Zimmermann;K. Möhwald;C. Lummer
通讯作者：
K. Bobzin;M. Öte;J. Schein;S. Zimmermann;K. Möhwald;C. Lummer
影响因子：
3.1
作者：
Bobzin, K.;Oete, M.
通讯作者：
Oete, M.