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首页> 外文期刊>Surface & Coatings Technology >Preparation of ferrosilicon-aluminium coating using a mechanical alloying technique: Study of thermal annealing on their structural characteristics
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Preparation of ferrosilicon-aluminium coating using a mechanical alloying technique: Study of thermal annealing on their structural characteristics

机译：使用机械合金化技术制备硅铁 - 铝涂层：对其结构特征的热退火研究

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摘要

In the present study, ferrosilicon-aluminium coating was successfully deposited on the surface of low-carbon steel using mechanical alloying (MA) technique. The coating structures after MA and annealing were studied using X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with energy disperse X-ray spectroscopy (EDX) and electron backscatter diffraction (EBSD). The roughness and hardness of the coatings were measured by Surfcorder SE300 and microhardness tester, respectively. The coating thickness after mechanical alloying is in the range of 65 mu m to 100 mu m and the surface roughness is around 11.581 mu m. Phase analysis showed that ferrosilicon-aluminium coating was composed by FeSi2, Si and Al0.8Si0.2 phases. While the thermal annealing led to the formation of FeAl3Si2 and Fe2Al3Si3 phases. Further cross-sectional observation of annealed samples showed that the coating consisted of four layers structures with the thickness of each layer depended on annealing temperature. The first top layer was composed of porous structure of FeAl3Si2 and Fe2Al3Si3 phases. The second and third layers possess a dense structure consisting of Fe3Al2Si3 and Fe2Al5 phases, respectively. The fourth layer at the coating/substrate interface was rich in Si, namely Si-rich layer. As annealing temperature increased, the thickness of Fe3Al2Si3 and Si-rich layer increased, but the thickness of Fe2Al5 layer decreased. The optimum microhardness value of ferrosilicon-aluminium coating after mechanical alloying and diffusion layer of annealed samples were 481 HV and 1170 HV, respectively.
机译：在本研究中，使用机械合金化（MA）技术成功地在低碳钢表面上成功地沉积了硅铁。使用X射线衍射（XRD）进行MA和退火后的涂层结构，扫描电子显微镜（SEM）配备有能量分散X射线光谱（EDX）和电子反向散射衍射（EBSD）。涂层的粗糙度和硬度分别通过Surfcorder SE300和Micro硬度测试仪测量。机械合金化后的涂层厚度在65μm至100μm的范围内，表面粗糙度约为11.581μm。相分析表明，硅铁 - 铝涂层由FeSi2，Si和Al0.8Si 0.2相组成。虽然热退火导致FEAL3SI2和FE2AL3SI3相的形成。退火样品的进一步横截面观察表明，涂层由四层结构组成，该层结构具有每层厚度的厚度依赖于退火温度。第一顶层由FEAL3SI2和FE2AL3SI3阶段的多孔结构组成。第二层和第三层具有分别由Fe3Al 2 Si 3和Fe2Al 5阶段组成的致密结构。涂层/底物界面的第四层富含Si，即富含Si的层。由于退火温度升高，Fe3Al2Si3和富含Si的层的厚度增加，但Fe2Al5层的厚度降低。机械合金化和退火样品扩散层后的铁硅氧烷 - 铝涂层的最佳显微硬度值分别为481HV和1170HV。

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