Formation mechanism and microstructure development in acicular mullite ceramics fabricated by controlled decomposition of fluorotopaz

Pyzik, Aleksander J.; Todd, Clifford S.; Han, Chan

doi:10.1016/j.jeurceramsoc.2007.03.021

Cited by 50 publications

(33 citation statements)

References 19 publications

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“…ACM test bars were made according to the process described by Pyzik et al 2 An experimental paste composed of alumina, kaolin clay (Table 2), organic binder, and other metal oxide additives was extruded through a ribbon die and cut into bars. An alumina-to-clay ratio corresponding to the composition of stoichiometric mullite was used.…”

Section: Methodsmentioning

confidence: 99%

“…1,2 Its resistance to chemical attack, thermal stability, and mechanical robustness at high porosities have made it an attractive candidate for use in filtration and catalytic support applications. [1][2][3] This study was undertaken to better understand how the acicular (i.e. needle-like) microstructure of ACM influences its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and mechanical properties of acicular mullite

Hsiung

Pyzik

Carlo

et al. 2013

Journal of the European Ceramic Society

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of acicular mullite

Hsiung

Pyzik

Carlo

et al. 2013

Journal of the European Ceramic Society

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“…Several processing routes have been reported for preparing mullite [3][4][5][6][7][8], among them sol-gel process is one of the most studied [9][10][11][12][13], which, in contrast to the classical method, offers very low crystallization temperature [14].…”

Section: Introductionmentioning

confidence: 99%

The kinetic of mullite crystallization: Effect of water content

Oliveira

Ribeiro

Brunelli

et al. 2010

Journal of Non-Crystalline Solids

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The kinetic of mullite crystallization from sol-gel method, with different water content, was investigated under non-isothermal conditions using DTA. The sols were obtained from Al(NO 3 ) 3 .9H 2 O (ANN) and Si (OC 2 H 5 ) 4 (TEOS) mixtures by varying the water-alcohol content of the system. The crystalline phase changes were verified by X-ray diffraction (XRD). For a sample prepared using ethanol-based alkoxide solution (M0), only Al-poor mullite (p-mullite) crystallizes at 1000°C; for the one synthesized with low water concentration (M6) Al-rich mullite (r-mullite) and spinel crystallize together; and for a sample prepared using a water-based alkoxide solution only spinel is formed. Thus, the variation of water contents during the synthesis caused great variations in the course of mullitization process. The average value of the apparent activation energy determined for p-mullite, r-mullite and spinel phase crystallization were found to be E = (899 ± 61) kJ mol −1 , E = (1015 ± 272) kJ mol −1 and E = (980 ± 196) kJ mol −1 , respectively. These results showed that sample M(0) was a monophasic gel, where aluminum and silicon atoms are mixed at a molecular level while sample M(100) was a diphasic gel, where silicon and aluminum atoms are distributed in a nanometric level. The fast reaction between TEOS and water molecules is responsible for this great difference in the sample's homogeneity. The kinetic model of the crystallization process was determined using Malek's procedure. It was established that the crystallization of p-mullite, r-mullite and spinel phase can be described by Šesták-Berggren autocatalytic model.

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“…Mullite whiskers, an important component in making reinforced composites, were used at high-temperature owing to their stable flexural strength which does not decrease even at temperatures of as high as approximately 1300 • C [4]. Recently, porous mullite ceramics prepared with mullite whiskers were selected as membrane reactor and hightemperature particulate filter due to its specific pore distribution [5,6]. Various processing routes have been reported for their preparation such as vapor-phase-reaction [7], thermal decomposition of minerals [8] and rare earth oxide doping [9,10].…”

Section: Introductionmentioning

confidence: 99%