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Study of the microstructure and mechanical properties of halloysite–kaolinite/BaCO3 ceramic composites

Published online by Cambridge University Press:  24 August 2018

Nedjima Bouzidi ,
Athmane Bouzidi ,
Raphael Oliveira Nunes  and
Djoudi Merabet
Nedjima Bouzidi*
Affiliation:
University of Bejaia, Materials Technology Laboratory of Process Engineering (LTMGP), Targua Ouzemmour Road, Bejaia 06000, Algeria
Athmane Bouzidi
Affiliation:
University of Bejaia, Electrical Engineering Laboratory (LGE), Targua Ouzemmour Road, Bejaia 06000, Algeria
Raphael Oliveira Nunes
Affiliation:
Federal Center of Technological Education of Minas Gerais, Mechanical Engineering Department, Belo Horizonte, MG, Brazil
Djoudi Merabet
Affiliation:
University of Bejaia, Materials Technology Laboratory of Process Engineering (LTMGP), Targua Ouzemmour Road, Bejaia 06000, Algeria
*
*E-mail: [email protected]
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Abstract

The present study examined the microstructure and mechanical properties of ceramic composites based on a kaolin from Djebel Debbagh, northeast Algeria, composed mainly of kaolinite and halloysite with the addition of various amounts of BaCO3. The composites were prepared by high-energy ball milling and sintered at 1100°C and 1200°C for 3 h. The samples sintered at 1200°C without BaCO3 were composed mainly of mullite, which disappeared with increasing BaCO3 content. X-ray diffraction investigation showed the presence of hexacelsian (BaAl2SiO6 and BaAl2Si2O8), which disappeared at BaCO3 contents >50 wt.% in favour of barium aluminium and barium silicate phases. At 40 wt.% BaCO3 content, the porosity of the composites decreased from 0.7% to 0.1% and the microhardness increased from 7 to 8 GPa, respectively, at 1100°C and 1200°C due to the amorphous phase.

Keywords

halloysitekaoliniteBaCO3hexacelsiansinteringmechanical properties
Type
Article
Information
Clay Minerals , Volume 53 , Issue 3 , September 2018 , pp. 403 - 412
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

This paper was presented during the session ‘CZ-01: Clays for ceramics’ of the International Clay Conference 2017.

Guest Associate Editor: I. Allegretta

References

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