Synthesis of Fe/Al2O3 and Fe/TiO2 nanocomposite powder by mechanical alloying (기계적합금화에 의한 Fe/Al2O3 및 Fe/TiO2계 나노복합분말의 제조)

이성희; Lee Chung-Hyo (이충효)

Synthesis of Fe/Al2O3 and Fe/TiO2 nanocomposite powder by mechanical alloying

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2009, 19(4), pp.202-207
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

이성희 ¹, Lee Chung-Hyo ¹

¹목포대학교

Accredited

ABSTRACT

Nanocomposite formation of metal-metal oxide systems by mechanical alloying (MA) has been investigated at room temperature. The systems we chose are the Fe3O4-M (M = Al, Ti), where pure metals are used as reducing agent. It is found that Fe/Al2O3 and Fe/TiO2 nanocomposite powders in which Al2O3 and TiO2 are dispersed in α-Fe matrix with nano-sized grains are obtained by MA of Fe3O4 with Al and Ti for 25 and 75 hours, respectively. It is suggested that the shorter MA time for the nanocomposite formation in Fe/Al2O3 is due to a large negative heat associated with the chemical reduction of magnetite by aluminum. X-ray diffraction results show that the average grain size of α-Fe in Fe/TiO2 nanocomposite powders is in the range of 30 nm. The change in magnetic properties also reflects the details of the solidstate reduction of magnetite by pure metals during MA.

KEYWORDS

Mechanical alloying, Magnetite, Intermediate phases of FeAl2O4 and Fe3Ti3O10, Metal-metal oxide nanocomposite, Large negative reaction heat

Citation status

* References for papers published after 2023 are currently being built.

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