Aluminum-silicon co-deposition by FB-CVD on austenitic stainless steel AISI 316

2nd International Meeting for Researchers in Materials and Plasma Technology

物理学;材料科学

Marulanda, J.L.^1,2 ; Perez, F.J.^2 ; Remolina-Millán, A.^3

Grupo de Investigación en Materiales Avanzados -GIMAV, Faculty of Mechanical Engineering, Universidad Tecnológica de Pereira, Pereira, Colombia^1

Grupo de Investigación en Ingeniera de Superficies y Materiales Nano-estructurados, Faculty of Chemical Sciences, Universidad Complutense de Madrid, Madrid, Spain^2

Grupo de Investigación-GIDETECHMA, Faculty of Mechanical Engineering, Universidad Pontificia Bolivariana Seccional Bucaramanga, Floridablanca, Colombia^3

关键词: Aluminum powders;    Aluminum silicon coating;    Aluminum silicons;    Coating surface;    Deposition time;    Temperature range;    ThermoCalc software;    Thermodynamic simulations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/466/1/012009/pdf
DOI  :  10.1088/1742-6596/466/1/012009

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Aluminum-silicon coatings were deposited on stainless steel AISI 316 in the temperature range of 540 to 560°C by CVD-FBR. It was used a fluidized bed with 2.5% silicon and 7.5% aluminum powder and 90% inert (alumina). This bed was fluidized with Ar and as an activator a mixture of HCl/H2 in ratios of 1/10 to 1/16. Furthermore, the deposition time of the coatings was varied between 45 minutes to 1.5 hours, with a 50% active gas, neutral gases 50%. Thermodynamic simulation was conducted with the Thermocalc software to get the possible compositions and amount of material deposited for the chosen conditions. The coatings presented the follow compounds FeAl2Si, FeAl2 and Fe2Al5. Aluminum-silicon coatings were heat treated to improve its mechanical properties and its behavior against oxidation for the inter diffusion of the alloying elements. The heat treatment causes the aluminum diffuse into the substrate and the iron diffuse into coating surface. This leads to the transformation of the above compounds in FeAl, Al2FeSi, Cr3Si, AlFeNi and AlCrFe.