In-flight oxidation of iron particles sprayed using gas and water stabilized plasma torch
In-flight oxidation of iron particles sprayed using gas and water stabilized plasma torch
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DOI：
10.1016/j.surfcoat.2004.05.030
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发表时间：
2005-05
影响因子：
5.4
通讯作者：
G. Espie;A. Denoirjean;P. Fauchais;J. Labbe;J. Dubský;O. Schneeweiss;K. Voleník
中科院分区：
文献类型：
--
作者：
G. Espie;A. Denoirjean;P. Fauchais;J. Labbe;J. Dubský;O. Schneeweiss;K. Voleník
本文致力于研究铁(低碳)粒子在直流飞行过程中的氧化。等离子体射流在空气中流动，以及颗粒在撞击和凝固后被氧化到衬底上。研究了两种类型的火炬：一种是传统的气体稳定等离子体(GPS)，有效功率为18kW；另一种是更为奇异的：水稳定等离子体(WSP)，有效功率为139kW。除了功率水平外，它们的主要区别在于GSP阳极附着物下游的等离子体气体比质量比WSP低近10倍，而WSP的等离子体温度相应地高10000 K。喷芯中的等离子体流在液态金属液滴内引起的对流运动促进了GSP的氧化。在抗击氧化方面，两种技术有很强的相似性，主要是形成非化学计量比的FeO。相反，在涂层中，根据喷涂过程中的温度，观察到Fe2O3或Fe3O4。
This paper is devoted to the study of the oxidation of iron (low carbon) particles during their flight in d.c. plasma jets flowing in air as well as the oxidation after the impact and solidification of particles onto the substrate. Two types of torches have been studied: a conventional one: gas stabilized plasma (GPS) with an effective power Peff=18 kW and a more exotic one: water stabilized plasma (WSP) with Peff=139 kW. Besides their power levels, their main difference lies in the plasma gas specific mass downstream of the anode attachment almost 10 times lower in GSP than in WSP with correspondingly the plasma temperature 10,000 K higher for WSP. The GSP oxidation is promoted by the convective movement induced within the liquid metal droplets by the plasma flow in the jet core. In-fight oxidation shows strong similarities for both techniques with mainly the formation of non-stoichiometric FexO. In contrast in coatings depending on the temperature during spraying, Fe2O3or Fe3O4are observed.