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首页> 外文会议>Minerals, Metals and Materials Society >Microstructures of TiSi_2 Coatings Obtained by Plasma Spray in both Air and Low Pressure Conditions
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Microstructures of TiSi_2 Coatings Obtained by Plasma Spray in both Air and Low Pressure Conditions

机译：通过空气和低压条件下等离子体喷涂获得的TISI_2涂层的微观结构

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Effect of plasma spray processing conditions on the microstructures of coatings was reported in this article. Starting TiSi_2 particles (<44 μm) were sprayed. Air plasma spraying (APS) and vacuum plasma spraying with low pressure (VPS) experiments were carried out, respectively, with a conventional DC arc plasma spray device. APS coatings were obtained at two different spraying distances, 100 mm and 200 mm, from the torch exit. The phases present in both APS and VPS coatings were analyzed by X-ray diffraction (XRD). Microstructures were observed by scanning electron microscopy (SEM). The chemical compositions were analyzed by electron probe microanalysis (EPMA). The results showed that, under air conditions, some starting TiSi_2 particles were converted into Ti_5Si_3, which was a major constitution in coating. With increasing the spraying distance, the amount of Ti_5Si_3 was increased pronouncedly. In addition, minor amounts of silicon and silicon oxide, Si-O, as well as titanium dioxide, TiO_2, were also found. In contrast, TiSi_2 phase was predominant in VPS coating. SEM observation revealed that the surface morphology of coatings was characterized by splashing in both cases. It implied that most of the starting TiSi_2 particles were well melted. The phenomena were discussed. This investigation provided a step further toward the understanding and optimizing of the TiSi_2 particles spraying process.
机译：本文报道了血浆喷雾处理条件对涂层微观结构的影响。喷洒了开始TISI_2颗粒（<44μm）。通过传统的DC电弧等离子体喷涂装置，分别进行空气等离子体喷涂（APS）和具有低压（VPS）实验的真空等离子体喷射。 APS涂层在两次不同的喷射距离，100mm和200mm，从焊炬出口获得。通过X射线衍射（XRD）分析APS和VPS涂层中存在的相。通过扫描电子显微镜（SEM）观察微观结构。通过电子探针微透析（EPMA）分析化学组合物。结果表明，在空气条件下，将一些起始TISI_2颗粒转化为TI_5SI_3，这是涂层中的主要构成。随着喷射距离的增加，TI_5SI_3的量增加了发音。另外，还发现，还发现了少量的硅和氧化硅，Si-O以及二氧化钛，TiO_2。相反，TISI_2相位在VPS涂层中是主要的。 SEM观察显示，在两种情况下溅起的表征涂层的表面形态。它暗示大部分开始TISI_2颗粒融化很好。讨论了现象。本研究进一步促进了对TISI_2粒子喷涂过程的理解和优化的步骤。

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