Kim, J.; Kim, S.; Kim, D.; ... - AIP Advances
The specific feature of multi-component oxides synthesized by hydrothermal process under high temperature (633 K) and highly pressurized water (18.9 MPa) near critical point. Effects of hydrothermal processing duration times 24 hours and 72 hours, respectively, on the oxide formation of the Ni
59Zr
20Ti
16Si
2Sn
3 metallic glass synthesized by powder metallurgy process were characterized by X-ray diffractometer, differential scanning calorimeter along with the particle size, morphology and crystalline phase of the oxides. The crystallization of the needle-shape NiTiO
3, ZrTiO
4 and ZrSnO
4 ternary oxide phases observed on the surface of metallic glass at below glass transition temperature and the morphology of oxide phases
more » changed to plate-shape around 2 μm in diameter by the increase processing time. This hydrothermal processing in subcritical water provides accelerated dense metal oxide crystals due to the reaction medium being at higher pressure than conventional oxidation processing.« less
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