Preparation of carbon-free B4C powder from B2O3 oxide by carbothermal reduction process
Release time:
2018-08-02
To minimize free carbon residue in the boroncarbide (B4C)
powder, a modified carbothermal reaction is performed where the
starting material compositions are adjusted. Because of boron loss in
the form of B2O2gas during the carbothermal reaction of the stoichiometric starting composition, the final B4C powders contain carbon residues. Thus, an excess B2O3is used in the reaction to compensate the loss and to obtain
stoichiometric powders. Parameters of the process for obtaining the
carbon free B4C powder by the carbothermal reduction have been determined using X-ray diffraction analysis andscanning electron microscopy. The synthesized B4C powder using a carbon-deficient composition shows no trace of carbon with two types of grain morphologies.
