| The experimental results for the fabrication of B₄C powder by Self-propagating high temperature synthesis are summerized as follows : (1) Even if theoretical adiabatic temperature of this reaction is a high, the self-combustion on the system was impossible. But the combustion was possible by another combustion process, a chemical furnace. (2) The reaction parameter to influence greatly in synthesis of B₄C powder is mole ratio of each elements. Experimental results show that the optimum ratio of B₂O₃, Mg and C is 2.0, 6.0∼7.0 and 1.0∼1.4 respectively. (3) The produced B₄C powder have a spherical shape and the size of production particle depends on the applied pressure. The higher applied pressure becomes, the smaller particle size is. (4) Since the impurity is evaporated by high temperature reaction, the purity of production powder is higher than that of reactants. |
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