Fabrication and properties of cordierite / anorthite composites

Naga, S. M.; Sayed, M. A.; El-Maghraby, H.F.; Khalil, M. Sh.; El‐Sayed, M. A.

doi:10.1016/j.ceramint.2017.01.142

Cited by 29 publications

(9 citation statements)

References 12 publications

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“…Anorthite crystallites have subhedral and dendritic shapes. The surface tension of coating tends to flatten the protrusion and allows a flux of solute atoms from the protrusion out to the sides, resulting in the formation of dendrites 32 …”

Section: Resultsmentioning

confidence: 99%

Preparation and strengthening mechanism of prestressed ceramic tile components

Sun

Bao

et al. 2021

Int J Applied Ceramic Tech

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To improve the flexural strength of ceramic tiles, a surface strengthening method is presented in this work. By cofiring coating and substrate, residual compressive stress is introduced in the coating. The phase composition and morphological characteristics of coating materials and the influences of coefficient of thermal expansion (CTE) and coating thickness on the flexural strength have been investigated. The prestressed ceramic tile is prepared by pressureless sintering a green body coated with a low CTE coating at 1200°C. The CTE of green body and optimal coating is 7.85 × 10−6°C−1 and 5.69 × 10−6°C−1, respectively. The flexural strength of prestressed porcelain tiles (89 ± 3 MP) has been increased by 102% when the coating thickness is 67 µm compared to their uncoated counterpart (44 ± 3 MPa). This simple surface strengthening method of ceramic tiles is cost‐efficient and economical for large‐scale industrial applications.

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Section: Resultsmentioning

confidence: 99%

Preparation and strengthening mechanism of prestressed ceramic tile components

Sun

Bao

et al. 2021

Int J Applied Ceramic Tech

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“…The Raman results are in agreement with the DTA and XRD results discussed above. Anorthite was reported to form as major crystalline phase in cordierite/anorthite composites [44] prepared from a mixture of sugar beat filter cake and talc carbonate. In other works, researchers reported the crystallization of anorthite in calcium oxide-magnesia-alumina-silica glass ceramics obtained from waste material and (CaMg(CO 3 ) 2 ) [45] or CaCO 3 [46].…”

Section: Resultsmentioning

confidence: 99%

“…These ceramic materials might have potential industrial applications. This is possible because on the one hand, monolithic cordierite is characterized by not only its low thermal expansion, dielectrical constant and electrical conductivity, but also its chemical stability and acceptable strength [44,49]. On the other hand, anorthite, which results from the addition of CaO, has similar attributes in addition to good wear resistance [44,50].…”

Section: Resultsmentioning

confidence: 99%

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

et al. 2020

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The effect of CaO on cordierite formation from kaolin-MgO-CaO powder mixtures, milled for 5 h and reaction sintered for 2 h in the temperature range 900-1400?C, was investigated. Phases formed in the developed materials were characterized by x-ray powder diffraction method (XRD) and Raman spectroscopy. Non-isothermal differential thermal analysis (DTA) and thermogravimetric (TG) experiments were performed from room temperature to 1400?C, at heating rates from 20 to 40?C/min. Activation energies were determined using Kissinger method. It was found that sintering the stoichiometric kaolin-magnesia mixture led to the nucleation and growth of monolithic cordierite; while cordierite along with anorthite were present in the other two samples where 4 or 8 wt% of CaO was added. The increase in CaO decreased cordierite formation temperature and increased the activation energy, which ranged from 445 to 619 kJ/mol for ?-cordierite and from 604 to 1335 kJ/mol for ?-cordierite.

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“…Cordierite (2MgO·2Al 2 O 3 ·5SiO 2 ) is one of the most important phases of the MgO‐SiO 2 ‐Al 2 O 3 system, having a low coefficient of thermal expansion, excellent thermal shock resistance, low dielectric constant, high resistivity, high chemical resistance, high refractoriness, and high mechanical strength 1‐7 . Cordierite‐based materials are used in various industrial fields in applications such as refractories, heat insulation, filters, membranes, heating elements, microwave and electromagnetic wave absorbers 8 …”

Section: Introductionmentioning

confidence: 99%

Development of cordierite/mullite composites using industrial wastes

Brito

Almeida

Neves

et al. 2020

Int J Applied Ceramic Tech

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1 | INTRODUCTION Cordierite (2MgO•2Al 2 O 3 •5SiO 2) is one of the most important phases of the MgO-SiO 2-Al 2 O 3 system, having a low coefficient of thermal expansion, excellent thermal shock resistance, low dielectric constant, high resistivity, high chemical resistance, high refractoriness, and high mechanical strength. 1-7 Cordierite-based materials are used in various industrial fields in applications such as refractories, heat insulation, filters, membranes, heating elements, microwave and electromagnetic wave absorbers. 8 There are various methods used to synthesize cordierite, among which solid-state reaction, sol-gel, and glass crystallization stand out. 9 Cordierite synthesis by solid-state reaction is considered to be the most widely used in industry due to its simplicity and low cost. 10 Regarding the formation of cordierite by solid-state reaction, some researchers 11 described this reaction as occurring through two well-defined steps. In the first step, cordierite begins to form at 1100°C, between mullite, enstatite, and cristobalite, and reaches a peak at 1275°C. In the second stage, previously formed cordierite reacts through a differential fusion mechanism with enstatite and cristobalite, forming a liquid at around 1330°C to 1355°C. This liquid is made up of eutectic cordierite-enstatite-silica. With increasing temperature, the liquid begins to react with the remaining

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Fabrication and properties of cordierite / anorthite composites

Cited by 29 publications

References 12 publications

Preparation and strengthening mechanism of prestressed ceramic tile components

Preparation and strengthening mechanism of prestressed ceramic tile components

Formation of anorthite containing cordierite materials through reaction sintering kaolin, MgO and CaO precursors

Development of cordierite/mullite composites using industrial wastes

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