Abstract
Gel combustion method was used to prepare nano-alumina from aluminum nitrate and stoichiometric amount of glycine as fuel. The TG–DTA pattern of the as-prepared powder (combustion product) exhibited exotherms with peaks around 500 and 900 °C accompanied with loss of weight of 25 and 5 % attributed to burning away of carbon left behind and decomposition of residual reaction intermediates left behind, respectively. Even though mass stability is attained above 900 °C, the DTA exhibited an exotherm around 1,150 °C attributed to transformation of gamma to alpha form of alumina. The XRD studies revealed that the powder heated to 900 °C was chemically pure nano-crystalline alumina while that heated above 1,150 °C was crystalline alpha form. As nano-crystalline powders are sinter-active, the nano-crystalline alumina formed by calcination at 900 °C was used to form the coating. A morphological feature of the agglomerates of nano-alumina powders were evaluated using SEM. The powder was de-agglomerated by wet grinding method. The dispersion conditions to form slurry using 900 °C calcined powder for slurry-based coating was optimized using zeta-potential studies, and it was found to exhibit a maximum value of −45 mV at a pH of 9. After 8 h of grinding, the median agglomerate size reduced to 2 μm. Rheological studies exhibited desired pseudoplastic behavior in the range of 10–20 vol.% of solid while the slurry with 15 vol.% only form crack free, dense, and adherent coating after heat treatment at 1,150 °C. The morphology of the coating was found to be uniform and dense.
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Hollenburg GW, Simonen EP, Kalinin G, Terlain A. Tritium/hydrogen barrier development. Fusion Eng Des. 1995;28:190–208.
Serra E, Benamati G, Ogorodnikova OV. Hydrogen isotopes transport parameters in fusion reactor materials. J Nucl Mater. 1998;255:105–15.
Yan Z, Huang Q, Guo Z, Song Y, Li C, Liu S, Han Q, Deng C. Vacuum plasma sprayed FeAl/Al2O3 functionally graded coatings for fusion reactor applications. Fusion Eng Des. 2010;85:1542–5.
Kureti S, Weisweiler W. A novel sol–gel method for the synthesis of c-aluminium oxide: development of the sol–gel transformation and characterization of the xerogel. J Non Cryst Solids. 2002;303:253–61.
Ramanathan S, Roy SK, Bhat R, Upadhyaya DD, Biswas AR. Preparation and characterisation of boehmite precursor and sinterable alumina powder from aqueous aluminium chloride-urea reaction. J Alloy Compd. 1996;243:39–44.
Novak C, Pokol G, Izvekov V, Gal T. Studies on the reactions of aluminium oxides and hydroxides. J Therm Anal Calorim. 1990;36:1895–909.
Pyzalski M, Wojcik M. The dehydroxylation of aluminium hydroxides and the kinetics of α-Al2O3 formation. J Therm Anal Calorim. 1990;36:2147–51.
Baca L, Plewa J, Pach L, Opfermann J. Kinetic analysis crystallization of α-Al2O3 by dynamic DTA technique. J Therm Anal Calorim. 2001;66:803–13.
Melnikov P, Nascimento VA, Arkhangelsky IV, Consolo LZZ et al. Thermal decomposition mechanism of aluminium nitrate octahydrate into aluminium oxide and characterization of intermediate products by the technique of computerized modelling. J Therm Anal Calorim. doi:10.1007/s10973-012-2566-1.
Kakade MB, Ramanathan S, Das D. Gel-combustion, characterization and processing of porous Ni-YSZ cermet for anodes of solid oxide fuel cells (SOFCs). Ceram Int. 2011;37:195–200.
Kingsley JJ, Patil KC. A novel combustion process for the synthesis of fine particle α-alumina and related oxide materials. Mater Lett. 1988;6:427–32.
Chick LA, Pederson LR, Maupin GD, Bates JK, Thomas LE, Exarhos GJ. Glycine-nitrate combustion synthesis of oxide ceramic powders. Mater Lett. 1990;10:6–12.
Ramanathan S, Kakade MB, Roy SK, Kutty KK. Processing and characterization of combustion synthesized YAG powders. Ceram Int. 2003;29:477–84.
Shea LE, Kittrick JM, Lopez OA, Sluzky E. Synthesis of red-emitting small particle size luminescent oxides using an optimized combustion process. J Am Ceram Soc. 1996;79:3257–65.
Kakade MB, Ramanathan S, Ravindran PV. Yttrium aluminium Garnet Powder by nitrate decomposition and nitrate–urea solution combustion reactions: a comparative study. J Alloy Compd. 2003;350:123–9.
Ramanathan S, Kakade MB, Ravindran PV, Kalekar DB, Chetty KV, Thyagi AK. Thermal decomposition behavior of precursors of YAG prepared by nitrate–glycine solution combustion and simple nitrate decomposition reactions. J Therm Anal Calorim. 2006;84:511–9.
Planda BM, Staszczuk P. Characterization of aluminium oxide samples by means of special thermal analysis techniques. J Therm Anal Calorim. 2000;62:561–8.
Banerjee S, Devi PS. Effect of citrate to nitrate ratio on the decomposition characteristics and phase evolution of alumina. J Therm Anal Calorim. 2007;90:699–706.
Sakka S, Yoko T. Sol–gel derived coating films and applications. In: Reisfeld R, Jorgenson CK, editors. Structure and bonding. Berlin: Springer; 1992. p. 89–118.
Cullity BD. Elements of X-ray diffraction. San Francisco: Addison-Wesley; 1977.
Haristodor C-M, Vrinceanu N, Pode R, Copcia VE, Botezatu E, Popovici E. Preparation and thermal stability of Al2O3-clay and Fe2O3-clay nanocomposites, with potential application as remediation of radioactive effluents. J Therm Anal Calorim. doi:10.1007/s10973-012-2330-6.
Peng T, Liu X, Dai K, Xiao J, Song H. Effect of acidity on the glycine–nitrate combustion synthesis of nanocrystalline alumina powder. Mater Res Bull. 2006;41:1638–45.
Norouzbeigi R, Edrissi M. Preparation of nano alumina powder via combustion synthesis: porous structure optimization via Taguchi L16 design. J Am Ceram Soc. 2011;94:4052–8.
Houivet D, Fallah JE, Haussonne JM. Dispersion and grinding of oxide powders into an aqueous slurry. J Am Ceram Soc. 2002;85:321–8.
Song M-G, Lee J, Koo J. Stabilization of gamma alumina slurry for chemical–mechanical polishing of copper. J Colloid Interface Sci. 2006;300:603–11.
Falamaki C, Naimi M, Aghaie A. Dip-coating technique for the manufacture of alumina microfilters using PVA and Na-CMC as binders: a comparative study. J Eur Ceram Soc. 2006;26:949–56.
Acknowledgements
The authors thank Mr. S. Koley of the Glass & Advanced Ceramics Division for his help in the TG–DTA studies, Mr. Rakesh Shukla of the Chemistry Division for his help in the XRD studies, Dr. S. Majumdar of Materials Processing Division, and Dr. A. Ghosh of the Glass & Advanced Ceramics Division, for their help in the SEM studies. Also they thank Dr. A.K. Suri, Director Materials Group for his keen interest in the work.
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Kakade, M.B., Ramanathan, S. & Kothiyal, G.P. Nano-alumina by gel combustion, its thermal characterization and slurry-based coating on stainless steel surface. J Therm Anal Calorim 112, 133–140 (2013). https://doi.org/10.1007/s10973-012-2700-0
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DOI: https://doi.org/10.1007/s10973-012-2700-0