Synthesis of MoSi2 powder by mechanical alloying

Synthesis of dense nanometric MoSi2 through mechanical and field activation

“…9 But when annealing was done at 850°C, the ␤ phase transformed to the ␣ phase. These observations are in contrast to those of Lee et al 11 They reported that the ␤ phase forms during annealing at 650°C of milled powders which did not contain this phase prior to annealing. These results show that phase formation during milling and the effect of subsequent annealing on phase transformation are complex phenomena which required further investigations.…”

“…The need for longer times to form MoSi 2 in a planetary mill was also confirmed in another study in which no product formed after 40 h of milling with CR ‫ס‬ 5. 11 In contrast, Bokhonov et al reported the formation of ␣-MoSi 2 after 6 min of milling. 12 In their work, however, the charge ratio was significantly higher (CR ‫ס‬ 20) than in the other cases.…”

“…6,7,9,11,12 In all of these reports, it was indicated that the formation of the ␤ (hightemperature) phase follows the formation of the ␣ (low-temperature) phase. Furthermore, an increase in milling time is reported to cause an increase in the ␤ phase formation, 6,12 as was also observed in this work.…”

Synthesis of Mo—Si—B in situ Composites by Mechanical Alloying.

“…While many studies on MA for the Mo-Si binary system [6][7][8][9][11][12][13] have been devoted, the synthesis of the Mo-Si-B ternary system by MA has been hardly reported. In this study, the synthesis of Mo-Si-B multi-phase alloys, so-called in-situ composites, was attempted by the combination of MA and spark plasma sintering (SPS) processes.…”

“…However, the synthesis of these materials is usually difficult because of their extremely high melting temperatures. Mechanical alloying (MA) has indicated to be a promising technique for material synthesis, especially for those with high melting temperatures, such as refractory metal silicides [6][7][8][9][10]. MA was developed in the 1970s for the synthesis of oxide dispersion-strengthened superalloy powders, and now is used to produce many kinds of non-equilibrium alloys, such as supersaturated solid solutions, metastable crystalline and amorphous phases and so on.…”