Application of factorial model for an optimization of partial replacement of feldspar by talc on the sintering process |
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Authors: | Robson Couto da Silva Felipe de Almeida La Porta Graciela Aparecida dos Santos Silva Renato Mandalozzo Tebcherani Evaldo Toniolo Kubaski Estevam Augusto Bonfante Sergio Mazurek Tebcherani |
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Affiliation: | 1. Department of Materials Engineering, State University of Ponta Grossa (UEPG), Ponta Grossa, Paraná, Brazil;2. Laboratory of Nanotechnology and Computational Chemistry, Federal University of Technology – Paraná, Londrina, Paraná, Brazil;3. Department of Chemistry, State University of Ponta Grossa (UEPG), Ponta Grossa, Paraná, Brazil;4. Department of Medicine, State University of Ponta Grossa (UEPG), Ponta Grossa, Paraná, Brazil;5. Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil |
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Abstract: | This research used a factorial model containing two levels and three variables to evaluate the partial substitution of sodium feldspar (albite) by a talc ore found in abundance in the region of Itaiacoca—Brazil. The model can also be used to verify the influence of initial talc particle size, proportion, and sintering threshold temperature on the following physical properties, such as linear shrinkage, water absorption, bulk density, total porosity, and firing color. In this study, the mechanical strength of the compositions was evaluated by the flexural strength test. The factorial model indicated the sintering temperature as the variable that most affects the samples’ densification and the proportion of talc as the variable that changes the firing color. The experiment that used a higher sintering temperature combined with a coarser talc granulometry presented the highest mechanical strength. When more refined granulometry was used, there was the beginning of an overfire process. Water absorption values in the range of .04% and modulus of rupture of 49 MPa were obtained, confirming the talc's effectiveness as a secondary flux agent suitable for the formulation of ceramic bodies. |
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Keywords: | factorial design granulometry sintering temperature talc |
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