Synthesis of nanocrystalline magnesium aluminate (MgAl2O4) spinel powder by the urea-formaldehyde polymer gel combustion route |
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| Authors: | K Prabhakaran DS Patil R Dayal NM Gokhale SC Sharma |
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| Affiliation: | Naval Materials Research Laboratory, Shil-Badlapure Road, Anand Nagara P.O. Addl. Ambernath, Thane-421 506, Maharashtra, India |
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| Abstract: | Nanocrystalline MgAl2O4 spinel powder was synthesized by the urea-formaldehyde (UF) polymer gel combustion route. A transparent gel formed from magnesium nitrate, aluminium nitrate and UF after drying underwet self-sustained combustion when initiated with a burning splinter. The combustion product on calcinations at 850 °C formed MgAl2O4 spinel. Calcination of the combustion product resulted in particle coarsening. The powder obtained by planetary ball milling of the spinel had a median particle size of 1.58 μm. The spinel particles are agglomerates of nanocrystallites of size in the range 10-30 nm. The compacts prepared by uni-axial pressing of the spinel powder sintered to >99% TD at 1600 °C. |
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| Keywords: | A Oxides B Chemical synthesis C Thermo gravimetric analysis C X-ray diffraction D Microstructure |
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