کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8023231 | 1517532 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterization of sol-gel derived non-stoichiometric aluminum phosphate coating
ترجمه فارسی عنوان
سنتز و مشخصه پوشش آلومینیوم فسفات بدون استئشیومتری حاصل از سل ژل
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
آلومینیوم فسفات، نانوکریستال آمورف، پوشش سل ژل،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
چکیده انگلیسی
The aim of this study was to synthesize a non-stoichiometric aluminum phosphate coating with high thermal stability. The aluminum phosphate precursor solution, in the presence of polyvinylpyrrolidone (PVP) as a crack-limiting agent was prepared by a sol-gel process and then applied on AISI 304 stainless steel substrate using the dip coating technique. Phase composition analysis of the coating material was performed by X-ray diffraction (XRD). The surface and cross sectional morphology of the coating after annealing at 500â¯Â°C for 15â¯min were observed using scanning electron microscopy (SEM). Topography and roughness of coated surface were investigated by atomic force microscopy (AFM). The amorphous-nanocrystalline structure and distribution of nanocrystals in the amorphous matrix were studied by transition electron microscopy (TEM). Thermal analysis and study of amorphous to crystalline transformation were investigated by thermal-gravimetric and differential scanning calorimetry (TG-DSC). Molecular spectroscopy of the synthesized powder was studied by Raman spectroscopy. According to SEM and AFM images a smooth, uniform, continuous and crack-free coating with 6.7â¯nm surface roughness was achieved. XRD analysis showed that the amorphous structure of the coating remained almost unchanged after annealing at 500â¯Â°C for 15â¯min. Conversely, an amorphous-nanocrystalline structure was obtained after air annealing at 1100â¯Â°C for 1â¯h. Also, oxide peaks number and intensity after oxidation at 1100â¯Â°C for 10â¯h were remarkably less in the coated sample than the bare one indicating the surface protection of aluminum phosphate coating against oxidation. The presence of graphitic and amorphous carbon (ID:IGâ¯=â¯0.97) in the coating structure was confirmed by Raman spectroscopy. TEM observations also confirmed the amorphous structure of the coating after annealing at 500â¯Â°C for 15â¯min and the partial transformation into a mixed amorphous-nanocrystalline structure after annealing at 1100â¯Â°C for 1â¯h. Accordingly, the thermal analysis of the coating material showed that the onset temperature of the amorphous to crystalline transformation was around 1050â¯Â°C, a value higher compared to previous reports (below 1000â¯Â°C) for the same material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 351, 15 October 2018, Pages 128-135
Journal: Surface and Coatings Technology - Volume 351, 15 October 2018, Pages 128-135
نویسندگان
F.S. Sayyedan, M.H. Enayati, M. Hashempour, A. Vicenzo, M. Bestetti,