Chapter 26. A New Process of Manufacturing α-Alumina

  1. John B. Wachtman Jr.
  1. Bolin Wu and
  2. Congji Zha

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314050.ch26

A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2

A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2

How to Cite

Wu, B. and Zha, C. (2008) A New Process of Manufacturing α-Alumina, in A Collection of Papers Presented at the 94th Annual Meeting and the 1992 Fall Meeting of the Materials & Equipment/Whitewares Manufacturing: Ceramic Engineering and Science Proceedings, Volume 14, Issue 1/2 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314050.ch26

Author Information

  1. Wuhan University of Technology Wuhan 430070 China

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375235

Online ISBN: 9780470314050

SEARCH

Keywords:

  • alpha alumina;
  • multiphase reaction principle;
  • optical microscope observation;
  • zhengzhou;
  • hexagonal bipyramid

Summary

A special process of manufacturing a-alumina was successfully developed. The advantage of this process is that the a-alumina obtained is in transparent dispersed powdered single crystal form, and need not be ground into powder when used as abradant, so the manufacturing cost can be reduced to very low levels. The particle size of the a-alumina is almost the same and its crystals are dodecahedrons or hexagonal bipyramids, which have not been observed in artificial a-alumina before. It is surprising that the hardness of the new type of a-alumina is 2500-2900 kg/mm2, but the hardness of currently available alumina is only 1900-2500 kg/mm2 (Japan) and 1400-1500 kg/mm2 (Zhengzhou, China), according to our test The sample with particle sizes from 2 to 100 an has been successfully produced by the new process.