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Hydrogen Reduction and Sintering Behavior of Al2O3/CuO Powder Mixtures Prepared from Different Raw Powders

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Abstract:

The reduction behavior of Al2O3/CuO powder mixtures, prepared from Al2O3/CuO or Al2O3/Cu-nitrate, was investigated by using thermogravimetry and hygrometry. Also, the influence of powder characteristics on the microstructure and properties of hot-pressed composites is analyzed. It was found that the hydrogen reduction process of nano-sized oxide particles and properties of sintered composites strongly depends on their distribution and size in composite powder. The formation mechanisms of nano-sized Cu dispersions are discussed based on the powder characteristics and reduction kinetics. In addition, the dependence of the microstructure and mechanical properties of hot-pressed composites on powder characteristics is discussed in terms of the initial size and distribution of Cu particles.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

181-184

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.181

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Online since:

August 2006

Authors:

Sung Tag Oh, Se Joong Yoon

Keywords:

Al2O3/Cu Nanocomposites, Hydrogen Reduction, Powder Processing, Sintering

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] K. Niihara: J. Ceram. Soc. Jpn. Vol. 99 (1991), p.974.

Google Scholar

[2] T. Sekino, T. Nakajima, S. Ueda and K. Niihara: J. Am. Ceram. Soc. Vol. 80 (1997), p.1139.

Google Scholar

[3] S. -T. Oh, M. Sando and K. Niihara: J. Mater. Sci. Vol. 36 (2001), p.1817.

Google Scholar

[4] R. Roy: Science Vol. 238 (1987), p.1664.

Google Scholar

[5] Gmelins Handbuch der Anorganischen Chemie-Cu 8, (Verlag Chemie GmbH, Germany 1958).

Google Scholar

[6] D. -G. Kim, S. -T. Oh, H. Jeon, C. -H. Lee and Y.D. Kim: J. Alloys Comp. Vol. 354 (2003), p.239.

Google Scholar

[7] W.D. Schubert: Refractory Met. & Hard Mater. Vol. 10 (1990), p.178.

Google Scholar

[8] E. -S. Yoon, J. -S. Lee, S. -T. Oh and B. -K. Kim: Intern. J. Refr. Met. & Hard Mater. Vol. 20 (2002), p.201.

Google Scholar

[9] W.D. Kingery: Introduction to Ceramics (John Wiley and Sons, NY 1976). Specimens Rel. density (%) Grain size (µm) Fracture strength (MPa) Monolithic Al2O3 99. 2 0. 89 536±35 Al2O3/CuO 99. 3 0. 67 819±53 Al2O3/Cu-nitrate 99. 0 0. 60 953±59 200 nm 200 nm (a) (b).

Google Scholar