Influence of Powder Size on the Corrosion and Wear Behavior of HVAF-Sprayed Fe-Based Coatings
Influence of Powder Size on the Corrosion and Wear Behavior of HVAF-Sprayed Fe-Based Coatings
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DOI：
10.1007/s11666-018-0819-7
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发表时间：
2018
影响因子：
3.1
通讯作者：
K. Bobzin;M. Öte;M. Knoch;J. Sommer
中科院分区：
文献类型：
--
作者：
K. Bobzin;M. Öte;M. Knoch;J. Sommer
这项研究的目的是调查粉末尺寸对涂层性能的影响，并深入了解其潜在的机理。因此，采用不同粉末尺寸的超音速火焰喷涂制备了FeCrB/WC-Co涂层。使用的FeCrB/WC-Co原料具有相同的化学成分，不同的粉末尺寸为− 45+11(Bobzin等人。(收录于ITSC--国际热喷涂会议和博览会，杜塞尔多夫，第339-345页，2017。ISBN：978-3-96144-000-9)，− 32+11(Bobzin et al.收录于2018年WTK-WerkstoffTechnisches Kolloquium，开姆尼茨。ISBN：978-3-00-058901-0)和− 20+3(微米)。随后对这些涂层的微观结构、物相组成以及磨损和腐蚀行为进行了分析。所有超音速火焰喷涂FeCrB/WC-Co涂层均具有致密的显微组织。结果表明，粉末粒度细小、化学成分相同的涂层，在高送粉速率和高极化低电流密度条件下，涂层中裂纹的形成较少。此外，所制备的超音速火焰喷涂FeCrB/WC-Co涂层与密封丝弧喷涂对照涂层相比，具有更高的耐滑动磨损和耐腐蚀性。研究还发现，FeCrB/WC-Co原料的粉末尺寸影响涂层的显微组织和相组成。推测超音速火焰喷涂FeCrB/WC-Co涂层的粉末尺寸越细，涂层的部分非晶态组织越明显，从而提高了涂层的耐蚀性。
The goal of this study is to investigate the influence of the powder size on the coating properties and to gain insights into the underlying mechanisms. Therefore, FeCrB/WC-Co coatings were produced by HVAF spraying using different powder sizes. The used FeCrB/WC-Co feedstock materials exhibit an identical chemical composition with varying powder sizes of − 45 + 11 (Bobzin et al. (in Proceedings of ITSC—international thermal spray conference and exposition, Düsseldorf, pp. 339–345, 2017. ISBN: 978-3-96144-000-9), − 32 + 11 (Bobzin et al. in Proceedings of 20. WTK—Werkstofftechnisches Kolloquium, Chemnitz, 2018. ISBN: 978-3-00-058901-0) and − 20 + 3 µm. These coatings were subsequently analyzed with regard to their microstructure and phase composition, as well as their wear and corrosion behavior. All HVAF-sprayed FeCrB/WC-Co coatings exhibited a very dense microstructure. It was observed that coatings, which were produced with a finer powder size and identical chemical composition, showed reduced crack formation in the coating at high powder feed rates and lower current densities at high polarizations. Furthermore, the presented HVAF-sprayed FeCrB/WC-Co coatings exhibited an increased sliding wear and corrosion resistance compared to a sealed wire-arc-sprayed reference coating. The investigation also revealed that the powder size of the FeCrB/WC-Co feedstock material influences the microstructure and the phase composition of the resulting coating. It is assumed that the finer powder size of the HVAF-sprayed FeCrB/WC-Co coatings results in partly amorphous coatings, which might improve the corrosion resistance.