Avaliação de novos depósitos de argilas provenientes da região sul do Amapá visando aplicação na indústria cerâmica

Silva, A. L.; Luna, Carlos Bruno Barreto; Chaves, Alexsandra Cristina; Neves, G. A.

doi:10.1590/0366-69132018643692275

Cited by 12 publications

(14 citation statements)

References 30 publications

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“…The reference values for the linear shrinkage after firing are: less than 1.5%; and acceptable: between 1.5% and 3% [38,39]. According to the results, it is verified that the shrinkage after firing was within the pattern optimum for a sample of the studied deposits and temperatures [22].…”

Section: Resultsmentioning

confidence: 53%

“…It may be noted that the content of water absorbed decreases as the temperature increases. The literature [38,40,41] indicates that the water absorption index must be between 8% and 25% for bricks. Thus, the clay sample of the deposit is in accordance with the standard for all the firing temperatures and thus corroborates with the results already presented to shrinkage after firing and presence of fluxing oxides [42].…”

Section: Resultsmentioning

confidence: 99%

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Characterization of clay deposit in the central region of Piauí for use in the ceramic industry

2020

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The clay ceramics industry comprises materials used in construction (bricks, tiles, and expanded clay, among others), is of great importance for Brazilian economic development, and the industry is seeking new sources of raw material, mainly clay. The present work aims to characterize a clay deposit located in the central region of the state of Piauí, to make feasible its use as ceramic raw material, seeking to boost the clay ceramics industry. The chemical composition, the crystalline phases, and the plasticity of the clay were analyzed. Specimens were prepared by uniaxial pressing, dried in an oven at 110 °C, and then heated to 900 °C, 1000 °C, and 1100 °C. Bending strength, apparent porosity, linear shrinkage, water absorption, and mineralogical, macrostructural, and microstructural analyses were determined. The results showed an improvement in the indices with the increase in the firing temperature and that the samples showed a reddish coloration due to the presence of iron, as well as quartz and kaolinite. Thus, the clay deposit has the potential to become raw material for the clay ceramics industry in the state of Piauí.

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Characterization of clay deposit in the central region of Piauí for use in the ceramic industry

2020

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“…SEBS-MA was responsible for this reduced elastic modulus due to its elastomeric character and high flexibility. 76,77 There was no severe reduction in the elastic modulus of the nanocomposites, suggesting that ferrite addition created a balanced mechanism between stiffness and toughness. All PA6/SEBS-g-MA/Ni-Zn and PA6/SEBS-g-MA/Ni-Zn-C nanocomposites presented higher elastic modulus than the PA6/SEBS-MA system.…”

Section: Mechanical Propertiesmentioning

confidence: 94%

Preparation of flexible and magnetic PA6/SEBS‐MA nanocomposites reinforced with Ni‐Zn ferrite

et al. 2021

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Magnetic and flexible nanocomposites of polyamide 6 (PA6)/styrene-(ethylene-butylene)-styrene grafted with maleic anhydride (SEBS-MA) were prepared using Ni-Zn ferrite synthesized by combustion reaction. Thermal treatment was applied to the Ni-Zn ferrite to form a more crystalline phase.The nanocomposites were processed in an internal mixer and later injection molded. The materials were characterized by torque rheometry, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Izod impact strength, tensile strength, magnetic measurements, differential scanning calorimetry (DSC), thermogravimetry (TG), heat deflection temperature (HDT), and scanning electron microscopy (SEM). Ferrite calcination led to a higher degree of crystallinity and nanocomposites with a higher number of crystalline peaks. This favored a higher saturation magnetization. The magnetic hysteresis curves of the nanocomposites indicated a ferrimagnetic behavior. The impact strength and elongation at break increased significantly compared to neat PA6, suggesting the formation of flexible and magnetic nanocomposites. This behavior was ascribed to a chemical reaction between the terminal amine groups of PA6 and the maleic anhydride of SEBS-MA, confirmed by FTIR and torque rheometry. Neat PA6 and the nanocomposites showed similar thermogravimetric, HDT, melting temperature, and crystallization properties. SEM results showed that the dispersed ferrite tends to form agglomerates, especially if calcined. In general, the addition of the non-calcined Ni-Zn ferrite to the PA6 matrix improved the mechanical properties. Conversely, the calcination of ferrite tended to improve the magnetic behavior of the nanocomposites.

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“…Based on the characterization of clay deposits in the southern region of Amapá, carried out by SILVA, et al [10] and SILVA, et al [11], they were found to have kaolinite, mica and quartz composition. In addition, for both, the physical-mechanical properties obtained in specimens by uniaxial pressing at 20 Mpa as the water absorption content, tend to decrease with increasing firing temperature, while the rupture module grows with increasing temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of clay used in the production of red ceramic pottery on semi-arid Cearense, Brazil

et al. 2021

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Red ceramics are part of one of the sectors of ceramic materials that make up the formation of the civil construction complex. In Cariri region and in the rest of Brazil, this segment uses clay as the main source of raw material, which favors the appearance of micro, small and medium enterprises that produce most of the products manufactured by the red ceramic sector. The objective of this work was the mineralogical and technological characterization of a clay sample from one of the potteries in Cariri region, intended for the manufacture of products to be used in civil construction such as tiles and bricks. For that, the techniques of X-ray fluorescence and X-ray diffraction were used, in addition to determining the physical-mechanical properties of the specimens by 4 ton-force uniaxial pressing followed by firing at 800, 900 and 1000ºC. The results showed that the sample is composed of quartz, kaolinite, smectite and muscovite and that it has granulometry mostly in fine fractions; after firing the clay shows reddish color and the Atterberg limits are within the range indicated for use on red ceramics. The clay under study has technological properties suitable for manufacture and the specimens burned at 800°C do not meet the values indicated by the literature. The studied clay proved to be suitable for application in tiles and perforated bricks.

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Avaliação de novos depósitos de argilas provenientes da região sul do Amapá visando aplicação na indústria cerâmica

Cited by 12 publications

References 30 publications

Characterization of clay deposit in the central region of Piauí for use in the ceramic industry

Characterization of clay deposit in the central region of Piauí for use in the ceramic industry

Preparation of flexible and magnetic PA6/SEBS‐MA nanocomposites reinforced with Ni‐Zn ferrite

Study of clay used in the production of red ceramic pottery on semi-arid Cearense, Brazil

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