Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-26T07:24:20.347Z Has data issue: false hasContentIssue false
  • English
  • Français

Preparation of plate-like α-Al2O3 particles in Na2SO4 flux using kaolin as the starting material

Published online by Cambridge University Press:  09 July 2018

Tan Hongbin
Tan Hongbin*
Affiliation:
School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong Shaanxi 723003, People's Republic of China
*
*E-mail: E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Plate-like α-Al2O3 particles are used to reinforce metal or ceramics to improve their mechanical properties. Here, we have demonstrated the production of alumina platelets using kaolin as a raw material in a sodium sulphate flux. When kaolin was sintered using Na2SO4 flux, the main phase formed in samples sintered at 900ºC was mullite, but alumina was produced at 1000ºC. Sintering at 1200ºC led to alumina and sodium aluminosilicate, with little of the mullite phase present. Plate-like α-Al2O3 particles were observed in samples sintered at 1200ºC, with diameters ranging from 1.5 to 4.5 µm and thicknesses from 0.05 to 0.1 µm. This production method is economically feasible because the raw materials have a low cost and the sintering temperature is low.

Keywords

kaolinmolten saltpreparation of aluminaplate-like α-Al2O3composite reinforcement
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 4 , December 2010 , pp. 503 - 506
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bernardo, E. & Scarinci, G. (2004) Sintering behaviour and mechanical properties of A12O3 platelet-reinforced glass matrix composites obtained by powder technology. Ceramics International, 30, 785–791.CrossRefGoogle Scholar
Bernardo, E., Scarinci, G. & Hreglich, S. (2005) Development and mechanical characterization of A12O3 platelet-reinforced glass matrix composites obtained from glasses coming from dismantled cathode ray tubes. Journal of the European Ceramic Society, 25, 1541–1550.CrossRefGoogle Scholar
Castelein, O., Guinebretiere, R., Bonnet, J.P. & Blanchart, P. (2001) Shape, size and composition of mullite nanocrystals from a rapidly sintered kaolin. Journal of the European Ceramic Society, 21, 2369–2376.CrossRefGoogle Scholar
Hashimoto, S. & Yamaguchi, A. (1999) Formation of porous aggregations composed of Al2O3 platelets using potassium sulfate flux. Journal of the European Ceramic Society, 19, 335–339.CrossRefGoogle Scholar
Kim, H.J., Kim, T.G., Kim, J.J., Park, S.S., Hong, S.S. & Lee, G.D. (2008) Influences of precursor and additive on the morphology of nanocrystalline α-alumina. Journal of Physics and Chemistry of Solids, 69, 1521–1524.CrossRefGoogle Scholar
Lee, S.G., Park, H.C., Kang, B.S., Seo, G.S., Hong, S.S. & Park, S.S. (2007) Synthesis of α-alumina platelets from γ-alumina with and without microwaves. Materials Science and Engineering A, 466, 79–83.CrossRefGoogle Scholar
Lu, H., Sun, H., Mao, A., Yang, H., Wang, H. & Hu, X. (2005) Preparation of plate-like nano α-Al2O3 using nano-aluminum seeds by wet-chemical methods. Materials Science and Engineering A, 406, 19–23.CrossRefGoogle Scholar
Mohammadi, T. & Pak, A. (2002) Making zeolite A membrane from kaolin by electrophoresis. Microporous andMesoporous Materials, 56, 81–88.CrossRefGoogle Scholar
Park, H.C., Lee, Y.B., Lee, S.G., Lee, C.H., Kim, J.K., Hong, S.S. & Park, S.S. (2005) Synthesis of betaalumina powders by microwave heating from solution- derived precipitates. Ceramics International, 31, 293–296.CrossRefGoogle Scholar
Park, Y.M., Yang, T.Y., Yoon, S.Y., Stevens, R. & Park, H.C. (2007) Mullite whiskers derived from coal fly ash. Materials Science and Engineering A, 454-455, 518–522.CrossRefGoogle Scholar
Pezzotti, G., Okuda, H., Muraki, N. & Nishida, T. (1999) In-situ determination of bridging stresses in Al2O3/Al2O3-platelet composites by fluorescence spectroscopy. Journal of the European Ceramic Society, 19, 601–608.CrossRefGoogle Scholar
Zhu, L., Huang, Q. & Liu, W. (2008) Synthesis of platelike α-Al2O3 single-crystal particles in NaCl—KC1 flux using A1(OH)3 powders as starting materials. Ceramics International, 34, 1729–1733.CrossRefGoogle Scholar