Stability and electrophoretic deposition of nano-SiC assisted by PEI. Issue 12 (2nd December 2019)

• Record Type: Journal Article
• Authors: Jafarpour, Mohammad; Aghajani, Hossein; Golshani Ajabshir, Ali
• Is Part Of: Journal of dispersion science and technology. Volume 40:Issue 12(2019)
• Page Start: 1715
• Page End: 1724
• Publication Date: 2019-12-02
• Subjects: Electrophoretic deposition -- particle size distribution -- Zeta potential -- PEI -- SiC; Emulsions -- Periodicals; Suspensions (Chemistry) -- Periodicals; Emulsions; Suspensions; 541.34
• DOI: 10.1080/01932691.2018.1535978
• Languages: English
• ISSNs: 0193-2691

Abstract

Abstract: Silicon carbide (SiC) coating is one of the best candidates for protection of carbon materials from oxidation at high temperatures. This paper describes the stability of 5 gl −1 SiC nano-particles suspension in alcoholic solvents and applying it on graphite by electrophoretic deposition (EPD) method. Different suspensions in ethanol, methanol, and isopropanol were prepared with polyethylene imine (PEI) as a surfactant. The effects of suspension medium on the stability of suspensions in the presence of 3 wt% of PEI were investigated by visual inspection (sedimentation height). As a result, suspension of nano-sized SiC in ethanol at pH =10, the most stable suspension, were selected to study the effect of PEI amount on suspension stability. Visual inspection, particle size distribution, and zeta potential were measured as a function of PEI dosage. Suspension with 6 wt% PEI obtaining the minimum sedimentation height, the maximum zeta potential (+37.6 mV), and the least particle size possessed better stability. Nano-sized SiC coating was applied on the graphite from optimum suspension with different values of voltage and deposition time. The film obtained at voltage of 40 V and duration of 50 s had lower micro-cracks and uniform surface. The thicknesses of green coating were measured about 30 μm. Graphical Abstract: UF0001