The effects of mechanical activation on the sintering of mullite produced from kaolin and aluminum powder

Sahraoui, Toufik; Belhouchet, H.; Heraiz, M.; Brihi, N.; Guermat, Abdelhak

doi:10.1016/j.ceramint.2016.04.157

Cited by 51 publications

(28 citation statements)

References 45 publications

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“…From the SEM images (Figure 3) of the hollow fiber ceramic membranes, especially HFM 1100 °C and HFM 1200 °C, there was an asymmetric structure consisting of a sponge-like region and by voids similar to "fingers", which is a typical structure for the hollow fibers prepared by the spinning method. In general, the increase in the sintering temperature caused a decrease in the apparent porosity, this behavior can be explained by the presence of liquid phase formed during heating at high temperatures, that eliminate small pores, leading to decreased porosity 20,32 . These results are in agreement with SEM images, Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…The porosity directly influences the permeability and mechanical resistance of membranes. More porous, the lower the resistance to the flow passing through the membrane 32 . Figure 5 shows flow measurements with distilled water by hollow fiber membranes, sintered at 1100 °C, 1200 °C, 1300 °C and 1400 °C, with transmembrane pressure of 1.0 Bar.…”

Section: Resultsmentioning

confidence: 99%

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Development of hollow fiber membranes with alumina and waste of quartzite

et al. 2019

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The development of ceramic membranes with different geometries and compositions extends the possibilities of industrial applications, inducing advantages in terms of increased permeability, membrane area by volume module and chemical, thermal and mechanical resistance. The use of low-cost raw materials is a trend that has grown in scientific research. The aim of this work is to prepare membranes with hollow fiber geometry from alumina and residue of quartzite, by the technique of immersion precipitation in distilled water from a mixture of ceramic mass with a solution of polyethersulfone and, synthesized in temperatures of 1100 ºC to 1500 °C. The hollow fiber membranes were characterized by chemical analysis, X-ray diffraction, particle size distribution, scanning electron microscopy, apparent porosity, flexural strength and permeated water flow by the membranes. The results indicated that the sintering temperature has direct influence on the formation of the mullite phase, and the properties of apparent porosity and permeate flow. The higher the sintering temperature (1400-1500 ° C) increase the formation of the mullite phase, the lower the porosity, as well as the lower the permeate water flow in the membranes. However, there was increase in flexural strength in the hollow fiber membranes with high temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Development of hollow fiber membranes with alumina and waste of quartzite

et al. 2019

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“…Also, the kyanite transforms into mullite with a melting point of 1850 C, which is consistent with previous research results. 36 In addition, albite disappears and decomposes into nepheline with a melting point of 1550 C and quartz. Nepheline can also be produced by the reaction of sodium-containing compounds in ZD coal with SiO 2 and Al 2 O 3 in oil shale directly at this temperature.…”

Section: Resultsmentioning

confidence: 99%

The characteristics of mineralogy, morphology and sintering during co-combustion of Zhundong coal and oil shale

Wang

Zhao

et al. 2017

RSC Adv.

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“…However, mullite is an attractive engineering material as it has low thermal expansion and conductivity, high creep resistance, and corrosion stability together with suitable strength and fracture toughness, and is one of the crystalline phases most frequently found in the final phase composition of both traditional ceramics and new inorganic functional materials . The significant role of mullite in various materials has been reported in the large number of publications in recent years …”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6][7][8] The significant role of mullite in various materials has been reported in the large number of publications in recent years. [9][10][11][12][13][14][15][16][17] Mullite whiskers, a special morphology of mullite crystal, have been considered as reinforcements in the high-temperature composites and porous ceramics for its excellent performance. 3,8,18,19 Various processing methods have been reported for preparing mullite whiskers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

Zhang

et al. 2017

Int J Applied Ceramic Tech

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Mullite whiskers are potential candidates for improving the mechanical and thermal properties of ceramic, glass, and composite material. In this work, well‐developed whisker‐shaped mullite has been produced by adding tribasic calcium phosphate (Ca3(PO4)2) into kaolin before calcining in air. In the raw kaolin, rod‐like mullite crystal of ~0.5‐1.0 μm length and ~0.05‐0.2 μm diameter formed at 1350°C, and mullite whiskers were not be observed; however, by doping 6 wt% Ca3(PO4)2 into kaolin, mullite whiskers of ~5.5 μm length and ~0.05‐0.10 μm diameter grew at 1250°C. The formation of high aspect ratio of mullite whiskers can probably be explained by the synergistic effect of P2O5 and CaO, resulting in the formation of liquid phase with a relatively higher content of Si and a lower viscosity at low temperature of 1250°C, which facilitates the growth of mullite displaying acicular morphology. The results are of interest in producing high aspect ratio of mullite whiskers from kaolin at reduced calcination temperatures.

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The effects of mechanical activation on the sintering of mullite produced from kaolin and aluminum powder

Cited by 51 publications

References 45 publications

Development of hollow fiber membranes with alumina and waste of quartzite

Development of hollow fiber membranes with alumina and waste of quartzite

The characteristics of mineralogy, morphology and sintering during co-combustion of Zhundong coal and oil shale

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

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