| Microwave-assisted Preparation of Precursor for the
Synthesis of Nanocrystalline Boron Carbide Powder |
Soja Kondothuvalappil Vijay,a Rama Krishna Prabhu,b David Annie,b Varadarajan Chandramouli,a Savari Anthonysamya, * and Ashish Jaina
Pages : 244-250
DOI : 10.1080/0371750X.2019.1832581 |
| Abstract |
| Nanocrystalline boron carbide was synthesized using a precursor. The precursor
was prepared by the thermal decomposition of a condensed product formed by
boric acid and mannitol. The condensed product was formed by microwaveassisted
heating of the aqueous solution of boric acid and mannitol. The
condensed product was thermally decomposed at various temperatures, viz. 400o,
500o and 600oC for 2 h. The thermally decomposed condensed product was further
heat treated at temperatures from 1000o to 1600oC for 10-240 min to optimize the
temperature and duration of heating in order to synthesize boron carbide with a
lower free carbon impurity phase. All the products were characterized for phase
purity and chemical composition (boron, total carbon and free carbon contents).
The formation of boron carbide was found to occur even at a lower temperature of
1000oC. The free carbon content in the product at 1600oC was found to be <0.5 wt%.
[Keywords: Microwave-assisted, Precursors, Carbides] |
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