Synthesis of the ternary boride Cr3AlB4 ceramics from raw powders contaminated with the amorphous phase

Cr 3 AlB 4 is one of the attractive compounds for high-temperature constrictive ceramics due to its combination of properties typical for ceramics or metals. In this study, the formation mechanism of Cr 3 AlB 4 , presented in the literature, was confirmed by means of the following analyses: XRD , DSC and SEM. According to them the synthesis of Cr 3 AlB 4 occurs is multi-step process with CrB 2 being formed first, followed by Cr 3 B 4 , which is intercalated by aluminium to form Cr 3 AlB 4 . Furthermore, most scientific papers do not consider the possibility of synthesising MAB phase from the powders containing amorphous phase. In presented work, possibility of synthesis of Cr 3 AlB 4 from the powders containing the amorphous phase and influence of this kind of raw powders on synthesis process is shown.