Effect of fluorine-containing additive on the synthesis and sintering of compositions from natural raw materials in the “cordierite –mullite” system

Вакалова, Т. В.; Погребенков, В. М.; Revva, I. B.; Rusinov, P.G.; Balamygin, D.I.

doi:10.1016/j.ceramint.2019.02.079

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…The improvement of the phases involved in the ceramic matrix is used to improve the characteristics of the multicomponent ceramic material. According to certain authors, combining cordierite with mullite in various ratios results in a ceramic material with good thermal and mechanical properties 27–31 . In recent years, only a few studies focused on the effects of oxides (i.e., MgO, SiO 2 , Al 2 O 3 , and ZrO 2 ) on the crystallization behaviors of cordierite 32,33 .…”

Section: Introductionmentioning

confidence: 99%

Recycling bagasse and rice hulls ash as a pore‐forming agent in the fabrication of cordierite–spinel porous ceramics

Wahsh

Mansour

Othman

et al. 2022

Int J Applied Ceramic Tech

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Bagasse and rice hulls ash are both waste materials. In recent years, in order to meet environmental protection, these materials have been recycled in the production of porous ceramics. A solid-state reaction mechanism of calcined alumina and talc was used to prepare cordierite-spinel porous ceramics. Talc was added from 30 to 60 wt.% at the expense of alumina and sintered at 1400 • C for 2 h. The effect of bagasse and rice hulls ash (as a pore forming agent) on the densification parameters, cold crushing strength (CCS), and pore size distribution was also studied. The phase composition (X-ray diffraction) and microstructure (scanning electron microscopy) of sintered samples were investigated. The results showed that the main phases present in the samples are cordierite, corundum, spinel, and sapphirine. In the sample with a higher amount of talc additions (60 wt.%), only the formation of the cordierite and spinel phases was observed. The bulk density of the samples and the apparent porosity ranged from 1.77 to 2.26 g/cm 3 and from 28.6% to 48.21%, respectively. The CCS of the samples ranges from 13.9 to 36.3 MPa. The microstructures of the sintered samples were observed for the formation of cordierite phase, alumina phase, and spinel phase in an excellent crystallization and phase arrangement.

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Section: Introductionmentioning

confidence: 99%

Recycling bagasse and rice hulls ash as a pore‐forming agent in the fabrication of cordierite–spinel porous ceramics

Wahsh

Mansour

Othman

et al. 2022

Int J Applied Ceramic Tech

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“…Figure 10 a shows the pore size distribution of the refractory composites treated at 1200 °C. RB4 specimens show the typical pore size distribution of mullite–cordierite ceramics [ 34 , 35 , 36 , 37 , 38 , 39 ]. The finesses of the kyanite particles tended to speed up sintering and induce the formation of mullite and cordierite.…”

Section: Resultsmentioning

confidence: 99%

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

2021

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The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

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Facile fabrication of cordierite-based porous ceramics with magnetic properties

Jia

et al. 2022

J Adv Ceram

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In this paper, cordierite-based porous ceramics with magnetic properties have been firstly in-situ synthesized by using MgO, Al2O3, and SiO2 powders as raw materials and Fe3O4 as a functional additive. Combining with the foam freeze casting method, near net size fabrication (total linear shrinkage < 2.86%) of the magnetic porous materials was realized by adjusting the amount of Fe3O4. The porosity, compressive strength, and saturation magnetization of the prepared materials were 83.9%–87.8%, 1.51–2.65 MPa, and 1.2–5.8 emu/g, respectively. The phase composition and microstructure evolutions during sintering were investigated briefly. The results showed that the synthesis temperature of cordierite was lowered about 100 °C due to the addition of Fe3O4. Except for the main phase-cordierite, Mg—Al—Fe spinel and α-Fe2O3 also existed in the final materials. The lattice parameters of the Mg—Al—Fe spinel and the amount of α-Fe2O3 changed obviously with the change in the sintering temperature and Fe3O4 amount, which mainly influenced the magnetic properties of the prepared materials. Thus, a facile fabrication method of the cordierite-based porous ceramics with the magnetic properties has been put forward in this paper.

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Effect of fluorine-containing additive on the synthesis and sintering of compositions from natural raw materials in the “cordierite –mullite” system

Cited by 10 publications

References 26 publications

Recycling bagasse and rice hulls ash as a pore‐forming agent in the fabrication of cordierite–spinel porous ceramics

Recycling bagasse and rice hulls ash as a pore‐forming agent in the fabrication of cordierite–spinel porous ceramics

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

Facile fabrication of cordierite-based porous ceramics with magnetic properties

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