Solidification behavior of falling germanium droplets produced by pulsated orifice ejection method

Preparation of Fe-based monodisperse spherical particles with fully glassy phase

“…These particles had particularly smooth surfaces compared to the crystalline metal particles that had ever been obtained by atomization including the POEM. The crystalline particles have more or less a rough surface texture due to grain boundaries and preferred growth orientation [12,13], but the present particles showed no crystalline vestige. In the case of the indicated particles, the average diameter, the size distribution, and the sphericity were determined to be 311 m, 1.24 m, and 1.57%, respectively.…”

“…This value was less than 10 3 K/s, which has been reported as the critical cooling rate estimated using the cast Fe-based bulk metallic glass [23]. This implies that heterogeneous nucleations were suppressed in the POEM because of container-less solidification [13]. Thus, R c was considered to be the intrinsic critical cooling rate of this Fe-based metallic glass.…”

“…The details of the formulae have been explained in our previous study [13]. In the case of amorphous structure alloys, atomic movement becomes slower below the temperature of the liquid and then is frozen at the glass transition temperature [19].…”

“…The repetition of this sequence at a quick rate enables the mass-production of monodisperse particles. The details of the POEM have been described in previous studies [12,13].…”

“…Hitherto, we have successfully developed a unique atomization process which is capable of producing monodisperse particles of various materials, by a method called the pulsated orifice ejection method (POEM) [12,13]. The POEM is able to mass-produce monodisperse particles of the desired diameter in the range of several tens to hundreds of micrometers.…”