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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*
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

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.

Type
Article
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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