Effect of metal particles oxidation during the APS on the wettability.
Effect of metal particles oxidation during the APS on the wettability.
复制标题
APS 过程中金属颗粒氧化对润湿性的影响。
DOI：
10.1111/j.1749-6632.1999.tb08761.x
复制
发表时间：
1999
影响因子：
5.2
通讯作者：
A. Vardelle
中科院分区：
文献类型：
--
作者：
G. Espie;P. Fauchais;B. Hannoyer;J. Labbe;A. Vardelle
摘要：对大气等离子喷涂(APS)过程中铁颗粒的飞行氧化进行了研究。熔融的颗粒被惰性气体(Ar)淬火，并在专门为此目的开发的实验装置中收集。利用这种设置，可以收集超过90wt%的颗粒。用X射线衍射仪、穆斯堡尔谱和扫描电子能谱等分析手段确定了氧化物相的数量和分布。结果表明，Wüstite(FeO)既存在于颗粒表面，也存在于颗粒核心。这种氧化物相约占所收集颗粒的12wt%，并且随着时间的推移保持稳定。为了模拟氧化铁颗粒在涂层形成过程中的润湿过程，进行了铁水在氧化铝和氧化锆衬底上的固液滴落研究。结果表明，APS过程中铁颗粒的氧化状态对观察到的接触角有很大影响。在氧化铁颗粒的情况下，观察到接触角的减小。
ABSTRACT: Investigations have been carried out to study the in flight oxidation of iron particles during Atmospheric Plasma Spray (APS) process. The molten particles are quenched by an inert gas (argon) and collected in a experimental set‐up especially developed for this purpose. With this set‐up, more than 90 wt% of the particles are collected. Investigation methods such as XRD, Mössbauer spectroscopy and SEM‐EDX are used to determine the amount and the distribution of oxide formed. The results indicate that wüstite (FeO) is present at the surface and also in the core of the particles. This oxide phase represents about 12 wt% of the collected particles and is stable over time. Sessile drop studies of molten iron on alumina and zirconia substrates are carried out to simulate the wetting of oxidized iron particles during coating formation. It is found that the oxidation state of iron particles during APS has a significant effect on the observed contact angles. A decrease of the contact angle is observed in the case of oxidized iron particles.