N. Nishiyama et al., PRODUCTION OF FLAKY TI-BASED AMORPHOUS POWDER BY A 2-STAGE QUENCHING TECHNIQUE AND ITS THERMAL-STABILITY, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 179, 1994, pp. 697-701
Amorphous Ti-based flaky powders about 2 mum thick were produced in a
wide range of particle size from 25 to 150 mum using a two-stage quenc
hing technique consisting of impact flattening supercooled liquid drop
lets obtained by high-pressure Ar atomization. The flaky powder partic
les have a smooth surface with a sharp edge and good metallic luster,
and their corrosion resistance is much better than that of pure Ti met
al and SUS 304. The aspect ratio is as large as 20-300. No appreciable
difference in T(g) and T(x) is found between the flaky powder and mel
t-spun ribbon, while the heat of structural relaxation for the powder
is 2.0-2.9 times as large as that for the ribbon. It is concluded that
the flaky amorphous powder is produced at a much higher cooling rate
than the ribbon because of the subsequent cooling of the supercooled l
iquid droplets.