The microstructure, coefficient of thermal expansion and flexural strength of cordierite ceramics prepared from alumina with different particle sizes

Kuščer, Danjela; Bantan, Ines; Hrovat, Marko; Malič, Barbara

doi:10.1016/j.jeurceramsoc.2016.08.032

Cited by 86 publications

(31 citation statements)

References 26 publications

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“…In contrast, compared with the previous samples (3 and 6 mass% of MgCO 3 ), the stress to rupture value of sample with 12 mass% of MgCO 3 increased to 88 ± 20 MPa under these sintering conditions. This behavior can be ascribed to several factors: (a) the development of a large amount of glassy phases, (b) higher density and closure of pores within samples, and (c) mullite and cordierite crystals formation 49‐51 . The XRD, SEM and dilatometric analyses were in agreement with the suggested factors.…”

Section: Resultssupporting

confidence: 66%

Sintering and final properties of kaolinite‐magnesite tapes for the manufacture of cordierite‐mullite ceramics

Hammas

Lecomte‐Nana

Daou

et al. 2020

Int J Applied Ceramic Tech

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The present work aims at studying the effect of the sintering temperature and magnesite addition on the structure and final properties of silicate ceramics tapes. A kaolinitic clay from Algeria was selected and mixed with different magnesite contents (≤12 mass%). Tape casting process was used to produce the green tapes in an aqueous system with optimized amount of surfactants. The green tapes were fired from 1000°C to 1200°C using a dwelling time of 30 minutes. The effect of the dwelling time was investigated for a firing temperature of 1200°C namely: 30 minutes, 1 hour 30 minutes and 3 hours for samples with 6 and 12 mass% of magnesite. Regarding firing conditions, crystalline phases, thermal conductivity, porosity, and flexural strength were analyzed. The results showed that increasing the sintering temperature to 1200°C tended to significantly decrease the total porosity of samples, which led to the improvement of the stress to rupture values. Specimens with 6 and 12 mass% sintered during 3 hours exhibited highest stress to rupture values (≈117 MPa) and lowest thermal conductivity (<0.2 W.m−1.K−1) and moderate open porosity (27%). The as‐obtained ceramics appeared promising for further utilization in refractory industry, thanks to the presence of both cordierite and mullite phases.

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Section: Resultssupporting

confidence: 66%

Sintering and final properties of kaolinite‐magnesite tapes for the manufacture of cordierite‐mullite ceramics

Hammas

Lecomte‐Nana

Daou

et al. 2020

Int J Applied Ceramic Tech

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“…Due to the unavailability of cordierite as natural material [8], it is usually prepared from diverse raw and/or waste materials using many methods [8][9][10][11][12][13][14][15][16][17]. However, reaction sintering abundant natural clay minerals and/or waste [4,7,[18][19][20][21][22][23][24] remained the preferred way to produce unexpansive cordierite materials. Intentionally, additives such as nickel dioxide [25], zinc [26], phosphorous and boron oxides [27], phosphorous oxide [28], ceria [29], nickel dioxide and titania [30], barium oxide [31], magnesia [32,33], and calcium oxide [8,[34][35][36][37] are added to ease the nucleation and growth of cordierite.…”

Section: Introductionmentioning

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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“…Currently, cordierite (2MgO•2Al 2 O 3 •5SiO 2 ) ceramic has been widely studied due to its outstanding properties, and it has many industrial applications, such as catalysts, microelectronics, refractory products, integrated circuit boards, heat exchanger for gas turbines, membranes, thermal shock-resistance tableware and porous ceramics [1][2][3]. The stoichiometric composition of cordierite, additives, preparation methods, and sintering process have received extensive concerns for fabricating cordierite ceramic [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of reduced Al2O3 mole ratio on fabrication of cordierite ceramic by solid-state sintering method

Zhao

2019

SCI SINTER

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Cordierite ceramic was fabricated by reducing Al 2 O 3 mole ratio from 2.0 to 1.4 with kaolin, silicon dioxide and magnesium oxide as the raw materials. The effect of reduced Al 2 O 3 mole ratio on the sintering behaviors, phase transition, main properties, and microstructure were characterized in detail. The results show that cordierite phase becomes the main crystallization phase at 1300 o C, and mullite phase can be consumed to produce cordierite phase by reducing Al 2 O 3 mole ratio. But additional quartz phase still exists until 1400 o C. Moreover, the open porosity, pore connectivity and pore size increase as Al 2 O 3 mole ratio reduces from 2.0 to 1.4 while the linear shrinkage percent and bulk density decrease with the reduced Al 2 O 3. It is considered that the sintering activity of the raw materials at low temperature decreases due to the increase of chemically pure magnesium oxide and silica with the decrease of Al 2 O 3 mole ratio, while the crystallization process, pore growth and cordierite phase rather than the liquid phase control the densification process at high temperature.

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The microstructure, coefficient of thermal expansion and flexural strength of cordierite ceramics prepared from alumina with different particle sizes

Cited by 86 publications

References 26 publications

Sintering and final properties of kaolinite‐magnesite tapes for the manufacture of cordierite‐mullite ceramics

Sintering and final properties of kaolinite‐magnesite tapes for the manufacture of cordierite‐mullite ceramics

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

Effect of reduced Al2O3 mole ratio on fabrication of cordierite ceramic by solid-state sintering method

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