Nano-alumina by gel combustion, its thermal characterization and slurry-based coating on stainless steel surface View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-10-09

AUTHORS

M. B. Kakade, S. Ramanathan, G. P. Kothiyal

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. More... »

PAGES

133-140

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URI

http://scigraph.springernature.com/pub.10.1007/s10973-012-2700-0

DOI

http://dx.doi.org/10.1007/s10973-012-2700-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038548713


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