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Sintering behaviors of two porcelainized stoneware compositions using pegmatite and nepheline syenite minerals

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Abstract

Semi-vitreous bodies, with flexural strength of ~78 MPa and water absorption of ~0.4 % for the optimal maturated specimens, were successfully prepared with solid solutions of pegmatite and nepheline syenite, respectively, for the full dense (P) and relatively porous composition (G). Despite the similarity on the bulk chemical composition of the two formulations, it was found that their thermal behaviors were significantly affected by the action of CaO on the flux system considered leading to earlier vitrification of P specimens with high flexural strength as from 1,175 °C. Conversely, the flexural strength of G specimens increases progressively with soaking time and temperature development up to 1,225 °C. The positive action of 5 mass% of CaO in the vitrification range of pegmatite solution, the relative low temperature of maturation of the semi-vitreous matrices, and the results of water absorption allow us to describe the formulations studied to offer promising potential in the production of sustainable and low-cost porcelainized stoneware. The high strength of P at relatively low temperature could be explained by the matrix-strengthening theory, while the extent of crystallization of G could be ascribed to the mullite theory.

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Acknowledgements

This article is the result of the scientific and technical collaboration between the Local Materials Promotion Authority/MIPROMALO (Cameroon) and the University of Modena and Reggio (Italy). The authors wish to thank Mr. E. Yanne, The Department of Materials Sciences and Architecture, Sahel Institute, the University of Maroua (Cameroon) for his valuable contribution regarding the raw materials collection.

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Authors and Affiliations

  1. Laboratory of Materials, Local Materials Promotion Authority/MIPROMALO, P.O Box 2396, Nkolbikok, Yaoundé, Cameroon

    T. Tchakounte Bakop, R. T. Tene Fongang, U. C. Melo & E. Kamseu

  2. Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via Vignolese 905/A, 41125, Modena, Italy

    E. Kamseu, P. Miselli & C. Leonelli

Authors
  1. T. Tchakounte Bakop
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  2. R. T. Tene Fongang
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  3. U. C. Melo
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  4. E. Kamseu
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  5. P. Miselli
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  6. C. Leonelli
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Correspondence to E. Kamseu.

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Tchakounte Bakop, T., Tene Fongang, R.T., Melo, U.C. et al. Sintering behaviors of two porcelainized stoneware compositions using pegmatite and nepheline syenite minerals. J Therm Anal Calorim 114, 113–123 (2013). https://doi.org/10.1007/s10973-012-2890-5

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  • DOI: https://doi.org/10.1007/s10973-012-2890-5

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