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Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin

Received: 19 June 2013     Published: 20 September 2013
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Abstract

The influence of MgO addition on the structure and properties of mullite prepared through reaction sintering of Algerian kaolin and Al2O3 was investigated. The raw powders were wet ball milled, dried and cold compacted using a uniaxial press. The green compacts were sintered 8 hours at 1600 and 1650°C. The microstructure of samples was characterized using a scanning electron microscope. Mechanical and thermal properties were characterized using Vicker’s hardness tester, a universal testing machine and a dilatometer. It was found that the increase of MgO content from 0 to 3 wt-% increased the hardness of samples sintered 8 hours at 1600°C from 1039 to 1316.57 HV. Also, the increase of MgO content in samples sintered 8 hours at 1600 and 1650°C increased the compressive strength up to a maximum then decreased it. For a sintering temperature of 1600°C, the increase of MgO content up to 2 wt-% increased the flexural strength, but a further increase of MgO to 3 wt-% decreased it again, while for a sintering temperature of 1650°C, the increase of MgO content from 0 to 3 wt-% increased the flexural strength from 103.45 to 472.25 MPa. Amongst MgO containing samples, the increase of MgO content increased the coefficient of thermal expansion; however, it remained lower than the coefficient of thermal expansion of the sample without MgO addition.

Published in American Journal of Modern Physics (Volume 2, Issue 5)
DOI 10.11648/j.ajmp.20130205.16
Page(s) 270-275
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2013. Published by Science Publishing Group

Keywords

Kaolin, Mullite, Alumina, Reaction Sintering, Mechanical Properties, Thermal Properties

References
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Cite This Article
  • APA Style

    A. Ouali, M. Heraiz, F. Sahnoune, H. Belhouchet, M. Fatmi, et al. (2013). Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin. American Journal of Modern Physics, 2(5), 270-275. https://doi.org/10.11648/j.ajmp.20130205.16

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    ACS Style

    A. Ouali; M. Heraiz; F. Sahnoune; H. Belhouchet; M. Fatmi, et al. Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin. Am. J. Mod. Phys. 2013, 2(5), 270-275. doi: 10.11648/j.ajmp.20130205.16

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    AMA Style

    A. Ouali, M. Heraiz, F. Sahnoune, H. Belhouchet, M. Fatmi, et al. Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin. Am J Mod Phys. 2013;2(5):270-275. doi: 10.11648/j.ajmp.20130205.16

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  • @article{10.11648/j.ajmp.20130205.16,
      author = {A. Ouali and M. Heraiz and F. Sahnoune and H. Belhouchet and M. Fatmi and N. Saheb},
      title = {Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin},
      journal = {American Journal of Modern Physics},
      volume = {2},
      number = {5},
      pages = {270-275},
      doi = {10.11648/j.ajmp.20130205.16},
      url = {https://doi.org/10.11648/j.ajmp.20130205.16},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmp.20130205.16},
      abstract = {The influence of MgO addition on the structure and properties of mullite prepared through reaction sintering of Algerian kaolin and Al2O3 was investigated. The raw powders were wet ball milled, dried and cold compacted using a uniaxial press. The green compacts were sintered 8 hours at 1600 and 1650°C. The microstructure of samples was characterized using a scanning electron microscope. Mechanical and thermal properties were characterized using Vicker’s hardness tester, a universal testing machine and a dilatometer. It was found that the increase of MgO content from 0 to 3 wt-% increased the hardness of samples sintered 8 hours at 1600°C from 1039 to 1316.57 HV. Also, the increase of MgO content in samples sintered 8 hours at 1600 and 1650°C increased the compressive strength up to a maximum then decreased it. For a sintering temperature of 1600°C, the increase of MgO content up to 2 wt-% increased the flexural strength, but a further increase of MgO to 3 wt-% decreased it again, while for a sintering temperature of 1650°C, the increase of MgO content from 0 to 3 wt-% increased the flexural strength from 103.45 to 472.25 MPa. Amongst MgO containing samples, the increase of MgO content increased the coefficient of thermal expansion; however, it remained lower than the coefficient of thermal expansion of the sample without MgO addition.},
     year = {2013}
    }
    

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  • TY  - JOUR
    T1  - Effect of MgO Addition on the Mechanical and Thermal Properties of Mullite Synthesised through Reaction Sintering of Al2O3 and Algerian Kaolin
    AU  - A. Ouali
    AU  - M. Heraiz
    AU  - F. Sahnoune
    AU  - H. Belhouchet
    AU  - M. Fatmi
    AU  - N. Saheb
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    N1  - https://doi.org/10.11648/j.ajmp.20130205.16
    DO  - 10.11648/j.ajmp.20130205.16
    T2  - American Journal of Modern Physics
    JF  - American Journal of Modern Physics
    JO  - American Journal of Modern Physics
    SP  - 270
    EP  - 275
    PB  - Science Publishing Group
    SN  - 2326-8891
    UR  - https://doi.org/10.11648/j.ajmp.20130205.16
    AB  - The influence of MgO addition on the structure and properties of mullite prepared through reaction sintering of Algerian kaolin and Al2O3 was investigated. The raw powders were wet ball milled, dried and cold compacted using a uniaxial press. The green compacts were sintered 8 hours at 1600 and 1650°C. The microstructure of samples was characterized using a scanning electron microscope. Mechanical and thermal properties were characterized using Vicker’s hardness tester, a universal testing machine and a dilatometer. It was found that the increase of MgO content from 0 to 3 wt-% increased the hardness of samples sintered 8 hours at 1600°C from 1039 to 1316.57 HV. Also, the increase of MgO content in samples sintered 8 hours at 1600 and 1650°C increased the compressive strength up to a maximum then decreased it. For a sintering temperature of 1600°C, the increase of MgO content up to 2 wt-% increased the flexural strength, but a further increase of MgO to 3 wt-% decreased it again, while for a sintering temperature of 1650°C, the increase of MgO content from 0 to 3 wt-% increased the flexural strength from 103.45 to 472.25 MPa. Amongst MgO containing samples, the increase of MgO content increased the coefficient of thermal expansion; however, it remained lower than the coefficient of thermal expansion of the sample without MgO addition.
    VL  - 2
    IS  - 5
    ER  - 

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Author Information
  • Laboratory of Physics and Chemistry of Materials, University of M’sila, 28000, M’sila, Algeria

  • Laboratory of Physics and Chemistry of Materials, University of M’sila, 28000, M’sila, Algeria

  • Laboratory of Physics and Chemistry of Materials, University of M’sila, 28000, M’sila, Algeria

  • Laboratory of Non Metallic Materials, IOMP, University of Setif 1, 19000, Algeria

  • Research Unit on Emerging Materials (RUEM), University of Setif 1, 19000, Algeria

  • Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dahran, 31261, Saudi Arabia

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