Effect of Nepheline Syenite Additives on the Technological Behavior of Ceramics and Porcelain Stoneware Tiles

El-Maghraby, M. S.; Ismail, A. I. M.; Ghabrial, Doris Sadek; El-Shakour, Z.A. Abd

doi:10.1007/s12633-019-00217-2

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…Mullite was present in all the studied compositions, and its content varied according to the formulation and firing temperature. According to Zanelli et al [3], mullite and quartz phases are present in most ceramic formulations, followed by different mineralogical phases depending on the raw materials and materials used in their manufacture [35,36]. From Figures 5-8, the temperature levels chosen for the studied compositions were selected (summarised in Table 5).…”

Section: Effect Of Feldspar Substitution With Basalt On Porosity and Flexural Strengthmentioning

confidence: 99%

Effect of Feldspar Substitution by Basalt on Pyroplastic Behaviour of Porcelain Tile Composition

et al. 2021

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This work aims to evaluate the effects of feldspar substitution by basalt on porcelain tile composition with respect to its porosity, flexural strength, and pyroplastic deformation. Three ceramic formulations with different amounts of feldspar substituted with basalt, 50% (C1), 75% (C2), and 100% (C3), were evaluated at three different temperatures, 1200, 1220, and 1240 °C. Specifically, the effect of replacing feldspar with basalt on the pyroplastic deformation of ceramic bodies was analysed using optical fleximetry. The porosity of C1 at 1200 °C was 19.3 ± 2.9%, while that of composition C3 was 22.2 ± 0.7% at 1240 °C. The flexural strength was strongly influenced by the temperature. For C1 at 1200 and 1240 °C, flexural strengths of 11.1 ± 0.6 and 22.2 ± 1.9 MPa, respectively, were obtained. Regarding fleximetry, thermal deformation decreased with an increase in the amount of feldspar substituted with basalt. It was observed that C2 and C3 deformed less at high temperatures than the other combinations of compositions and temperature, probably owing to the lower amount of residual glass phase present during cooling. Compositions with higher substitution amounts of basalt (i.e., C2 and C3) exhibited more stable thermal behaviour than C0.

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Section: Effect Of Feldspar Substitution With Basalt On Porosity and Flexural Strengthmentioning

confidence: 99%

Effect of Feldspar Substitution by Basalt on Pyroplastic Behaviour of Porcelain Tile Composition

et al. 2021

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“…Nepheline (Na,K)AlSiO 4 is a feldspathoidal mineral, with great economical importance as a raw material in glass and ceramics manufacture. Thus, nepheline is used in the production of porcelain stoneware tiles, 1 bone china, 2 or composites for physicochemical purification of wastewater, 3 among others.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of the transformation of sodalite to nepheline

2022

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The kinetics and mechanism of the development of nepheline (NaAlSiO4) through thermal transformation of sodalite (Na4Al3Si3O12Cl) was studied by means of differential thermal analysis at different heating rates (10°C min−1 to 50°C min−1) to control the evolution of the crystallization fraction. The conversion of sodalite (cubic crystal) to pure nepheline (hexagonal crystal) took place in the 800°C–900°C interval. The activation energy for nepheline crystallization from sodalite was determined by isothermal and non‐isothermal methods. The ratio t0.75/t0.25, together with the Avrami exponent (n) and the numerical factor of the dimensionality of crystal growth (m) parameters indicated that dominant crystallization mechanism in nepheline development is bulk crystallization mechanism controlled by interface reaction.

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“…One way of reducing the sintering temperature of porcelain is to add a sintering additive to the raw materials. Several sources of research have reported that the sintering temperature decreased by mixing metal oxides or other fluxing agents into porcelain, whereas these expensive sintering aids are hardly applied to porcelain production [ 10 , 11 , 12 , 13 , 14 ]. O. Turkmen reduced the firing temperature of 25 °C of hard porcelain by 1 wt% wollastonite addition, but the bending strength decreased and the porosity increased [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Porcelain Toughened by Activated Kaolinite in a Lower Sintering Temperature

Lin

Tan

et al. 2022

Materials

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A high sintering temperature is usually required to acquire excellent performance in the ceramic industry, but it results in high fuel consumption and high pollution. To reduce the sintering temperature and to toughen the porcelain, a self-produced sintering additive of citric acid activated kaolinite was added to the raw material; X-ray powder diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), and thermal gravity analysis and differential scanning calorimetry (TG-DSC) were used to characterize the samples, and the toughening mechanism was discussed. The citric acid activated kaolinite obtained high activity and a large specific surface area. After introducing the activated kaolinite, the bending strength of porcelain at 1270 °C increased from 100.08 MPa to 124.04 Mpa, which was 11.45% higher than that of porcelain without activated kaolinite at 1350 °C. The results of XRD revealed that the content of mullite increased and the quartz decreased at 1270 °C, and the well-distributed needle-like mullite was observed in the images of SEM with the addition of citric acid activated kaolinite. The TG-DSC results indicated adding activated kaolinite to porcelain raw materials reduced the formation of mullite to 994.6 °C. The formation of mullite in a lower temperature served as mullite seeds in a green body during firing, and it enhanced the growth of mullite. These contributed to the appropriate phase composition and the excellent microstructure of porcelain. Thus, the distinguished mechanical performance of porcelain was obtained. Moreover, the sintering additive had no adverse effect on the porcelain body as citric acid-activated kaolinite was one of the main components of the porcelain raw material.

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Effect of Nepheline Syenite Additives on the Technological Behavior of Ceramics and Porcelain Stoneware Tiles

Cited by 9 publications

References 12 publications

Effect of Feldspar Substitution by Basalt on Pyroplastic Behaviour of Porcelain Tile Composition

Effect of Feldspar Substitution by Basalt on Pyroplastic Behaviour of Porcelain Tile Composition

Kinetic study of the transformation of sodalite to nepheline

The Mechanism of Porcelain Toughened by Activated Kaolinite in a Lower Sintering Temperature

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