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

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{sub 59}Zr{sub 20}Ti{sub 16}Si{sub 2}Sn{sub 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{sub 3}, ZrTiO{sub 4} and ZrSnO{sub 4} 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 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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Headquarters Bearing Division, Iljin Global Co., Ltd., Seoul 135-875 (Korea, Republic of)
  2. Rare Metals R&D Group, Korea Institute of Industrial Technology, Incheon 406-840 (Korea, Republic of)
  3. Center for Noncrystalline Materials, Yonsei University, Seoul 120-749 (Korea, Republic of)
  4. Division of Materials and Engineering, Ames Laboratory (US DOE), Ames, Iowa 50011 (United States)
  5. LWR Fuel Technology Division, Korea Atomic Energy Institute, Daejeon 305-600 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22493945
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTALLIZATION; CRYSTALS; METALLIC GLASSES; MORPHOLOGY; NICKEL BASE ALLOYS; NICKEL COMPOUNDS; OXIDATION; PARTICLE SIZE; POWDER METALLURGY; PRESSURE DEPENDENCE; SILICON ADDITIONS; SURFACES; TEMPERATURE DEPENDENCE; TIN ADDITIONS; TITANATES; TITANIUM ALLOYS; TRANSITION TEMPERATURE; WATER; ZIRCONIUM ALLOYS; ZIRCONIUM COMPOUNDS