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Journal of Materials Science

, Volume 30, Issue 5, pp 1240–1244 | Cite as

Preparation of alumina and alumina-silica powders by wire explosion resulting from electric discharge

  • M. Umakoshi
  • T. Yoshitomi
  • A. Kato
Papers

Abstract

Wires of aluminium and aluminium-silicon alloys containing 5.2 and 12.1 wt% Si were exploded in air by electric discharge, and the properties of the powders obtained were examined. The powders consisted of large particles of several micrometres and very fine spherical ones, which were formed from the metallic droplets and vapours, respectively, and were mostly oxidized. The large particles decreased with an increase in the charged energy. Although the particle-size distribution was broad, the average particle sizes were small and were increased from 0.7 μm to 1.3 μm with an increase in the charged energy. These powders were identified as γ-alumina, amorphous alumina-silica compound and a small amount of the metal. The amorphous phase crystallized to mullite in the temperature range 1153–1243 K, and the crystallization temperature fell with increase in the charged energy because the amount of fine particles formed from the vapours increased.

Keywords

Polymer Alumina Particle Size Crystallization Large Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    T. Suhara, S. Fukuda and H. Ito, J. Jpn Thermal Spray. Soc. 5 (1968) 1.Google Scholar
  2. 2.
    T. Suhara, S. Fukuda, H. Ito and K. Fukunaga, J. Jpn Soc. Tech. Plasticity 11 (1970) 718.Google Scholar
  3. 3.
    K. Kase, H. Ito and Y. Mihashi, J. Jpn. Soc. Powder Powder Metall. 16 (1970) 338.CrossRefGoogle Scholar
  4. 4.
    Idem, ibid. 20 (1973) 67.CrossRefGoogle Scholar
  5. 5.
    M. Umakoshi, H. Ito and A. Kato, Yogyo-Kyokai-Shi 95 (1987) 235.CrossRefGoogle Scholar
  6. 6.
    T. Suhara and S. Fukuda, J. Soc. Mater. Sci. Jpn 24 (1975) 1003.CrossRefGoogle Scholar
  7. 7.
    T. Suhara, K. Kitajima, S. Fukuda and H. Ito, J. Jpn Inst. Metals 39 (1975) 899.CrossRefGoogle Scholar
  8. 8.
    O. Kubaschewski and C. B. Alcock, “Metallurgical Thermochemistry”, 5th Edn (Pergamon Press, Oxford, 1979) p. 267.Google Scholar
  9. 9.
    M. Umakoshi, T. Yoshitomi, H. Ito and A. Kato, in “Proceedings of the 1991 Annual Meeting of the Ceramic Society of Japan” edited by N. Mizutani (The Ceramic Society of Japan, Tokyo, 1991) p. 209.Google Scholar
  10. 10.
    T. Yanagase and Y. Suginohara, Tetsu-to-Hagane 57 (1971) 142.CrossRefGoogle Scholar
  11. 11.
    K. Okada, N. Otsuka and J. Kosaka, in “Mullite, Series of the Materials”, edited by S. Somiya (Uchida Rokakuho, Tokyo, 1985) p. 13.Google Scholar

Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • M. Umakoshi
    • 1
  • T. Yoshitomi
    • 1
  • A. Kato
    • 2
  1. 1.Department of Materials Science and Metallurgical EngineeringKurume National College of TechnologyFukuokaJapan
  2. 2.Department of Chemical Science and Technology, Faculty of EngineeringKyushu UniversityFukuokaJapan

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