This paper describes the formation
mechanism of monophasic Al3BC3 powder with hexagonal
plate-like morphology
using Al, B4C, and C powders in a stoichiometric ratio.
For the synthesis of pure Al3BC3 by the conventional
solid–state reaction method, it is important to avoid contamination
from the starting powders. Thermogravimetry–differential thermal
analysis curves and quantitative analysis by inductively coupled plasma-atomic
emission spectroscopy revealed that there was no vaporization of the
powder mixture during heating up to 1470 °C in a high-purity
argon atmosphere. We found that the phases and Al3BC3 particle morphology after heating at 1800 °C strongly
depended on the mixing conditions. In the case of a two-step process
(remixing and reheating the sample), particles with random morphology
were observed. On the other hand, well-faceted Al3BC3 particles were predominantly formed in a one-step process
that involved heating after ball-milling for 24 h.
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