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Effect of hydrothermal condition on the formation of multi-component oxides of Ni-based metallic glass under high temperature water near the critical point

TitleEffect of hydrothermal condition on the formation of multi-component oxides of Ni-based metallic glass under high temperature water near the critical point
Publication TypeJournal Article
Year of Publication2015
AuthorsKim, JS, Kim, SY, Kim, DH, Ott, RT, Kim, HG, Lee, MH
JournalAip Advances
Volume5
Pagination077132
Date Published07
Type of ArticleArticle
ISBN Number2158-3226
Accession NumberWOS:000358922500032
Keywordscomposites, crystallization, nanoparticles, supercritical water, surface-area
Abstract

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 Ni59Zr20Ti16Si2Sn3 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 NiTiO3, ZrTiO4 and ZrSnO4 ternary oxide phases observed on the surface of metallic glass at below glass transition temperature and the morphology of oxide phases changed to plate-shape around 2 mu m 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. (C) 2015 Author(s).

DOI10.1063/1.4926972
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