Phase formation and crystallization kinetics in cordierite ceramics prepared from kaolinite and magnesia

Redaoui, D.; Sahnoune, F.; Heraiz, M.; Saheb, Nouari

doi:10.1016/j.ceramint.2017.11.119

Cited by 33 publications

(18 citation statements)

References 55 publications

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“…The second exothermic peak at 1200 ℃ corresponds to the formation of α-cordierite phase (indialite). This is in agreement with the findings of Redaoui et al [38] that reported 1153 ℃ for formation of α-cordierite phase. Yürüyen et al [39] studied with mechanically activated talckaolinitealumina ceramics system and reported that the α-cordierite phase formed at about 1265 ℃.…”

Section: Characterization Of Mechanically Activated Powder Mixturesupporting

confidence: 94%

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Parlak

Demirkıran

2018

J Adv Ceram

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In this study, natural zeolite was used as source of silica to produce cordierite. MgO and Al 2 O 3 were added to zeolite to obtain the cordierite stoichiometry. Mixture of these raw materials was mechanically activated for different durations. The mechanically activated powder mixture was characterized using XRD, DSC, SEM, specific surface area, and particle size analyzer. The pycnometer method was used to measure the densities of mechanically activated powder mixtures. Mechanically activated for 60 min powder mixture was sintered at 1150-1350 ℃ for 1 h. The sintering behavior of the samples was determined by measuring the linear shrinkage, density, and apparent porosity. The phases in the sintered samples were identified by XRD. Cordierite and spinel phases were detected for sintered at a temperature higher than 1150 ℃ but corundum accompanied to cordierite and spinel at 1150 ℃. The microstructure of the samples was examined using both SEM and AFM. The sintering behavior and microstructural properties of the samples changed with an increase in the sintering temperature. As the apparent porosity increased with increasing sintering temperature, linear shrinkage and density values decreased. Density values were determined as 2.31-2.69 g/cm 3 depending on the temperature. The grains coarsened at higher temperature and the average grain size depending on the temperature was 1.34-1.96 μm. From the results optimum sintering temperature was determined as 1250 ℃. Dense material was produced at a temperature as low as 1250 ℃ using zeolite as raw material.

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Section: Characterization Of Mechanically Activated Powder Mixturesupporting

confidence: 94%

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Parlak

Demirkıran

2018

J Adv Ceram

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“…Relevant ceramics properties are strongly dependent on the composition, nature of raw starting materials, the presence of impurities, additives, and also the fabrication technique . Secondary crystalline phase such as mullite, cordierite, spinel, and cristobalite are often associated to corundum as the primary phase.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and microstructural properties of cameroonian bauxite ceramics for ballistic applications

Tchamba

Mbessa

Metekong

et al. 2019

Int J Applied Ceramic Tech

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Thermal reactions of bauxite, kaolin, and talc compound were investigated at 1550°C to obtain high rigidity ceramic for ballistic applications. The compressed strength and density of the bauxite ceramics with kaolin and talc substitutions varied from 195 to 455 MPa and density from 2.85 to 4.05 g/cm 3 . The Young's modulus varied from 107 GPa to 222 GPa with water absorption varying from 1.4 wt% to 5.9 wt% for 0 wt% and 15 wt% substitution of kaolin. The substitution of bauxite-kaolin by talc up to 7.5 wt% contributes to the resorption of microporosity and increase the Young's modulus from 107 to 195 GPa. The XRD of bauxite ceramic with kaolin substitution showed the presence of corundum and mullite; whereas the XRD of bauxite ceramic with kaolin and talc substitution showed the presence of corundum, mullite, and spinel. The ballistic simulation with abaqus dassult SIMULA using the JH-2 model predict that an impact with velocity of 525 to 810 m/s on the 10 mm thick bauxite ceramic does not erode or damage for a projectile consisting of tungsten alloy with dimensions: 12 mm in diameter, 61.5 mm length, and 72 g of mass. The bauxite ceramics can be used for ballistic applications. K E Y W O R D Sballistic application, bauxite ceramic, Young's modulus 950 |

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“…It is known that kaolin, a natural clay mineral composed primarily of Al 2 O 3 and SiO 2 , experiences many reactions and transformations where the oxides and additives react to yield mullite [1] or cordierite [2,3] based materials. As one of the main phases of the magnesiaalumina-silica system, cordierite has values of 2.53 g/cm 3 , 1470 °C, and ˃ 10 12 Ω cm for its density, melting temperature, and electrical resistivity, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of cordierite and phase transformation kinetics in cordierite materials [8,[25][26][27][28][29][30][31][38][39][40][41] were characterized by differential thermal analysis [28][29][30][31][38][39], differential scanning calorimetry [8,[39][40], and x-ray diffraction [8,[25][26][27]. Isothermal [25][26][27]35] and non-isothermal [8,25,[28][29][30][31][38][39][40][41] experiments were carried out and activation energy values from 170 to 964 kJ/molwere reported [8,2,3,[25][26][27][28][29][30][31]…”

Section: Introductionmentioning

confidence: 99%

“…Isothermal [25][26][27]35] and non-isothermal [8,25,[28][29][30][31][38][39][40][41] experiments were carried out and activation energy values from 170 to 964 kJ/molwere reported [8,2,3,[25][26][27][28][29][30][31][38][39][40][41][42][43]. Recently, the authors synthesized low-cost stoichiometric [2] and non-stoichiometric [3] cordierite ceramic materials, by reaction sintering Algerian natural clay minerals and synthetic magnesia, and studied the effect of temperature and MgO on cordierite formation. The objectives of this study are to investigate and report the influence of CaO content on the kinetics of cordierite formation from kaolin-MgO-CaO powder mixtures and explore the possibility to reduce the synthesis temperature.…”

Section: Introductionmentioning

confidence: 99%

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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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Phase formation and crystallization kinetics in cordierite ceramics prepared from kaolinite and magnesia

Cited by 33 publications

References 55 publications

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Zeolite usage as source of silica to produce cordierite in MgO–Al2O3–SiO2 system

Mechanical and microstructural properties of cameroonian bauxite ceramics for ballistic applications

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

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