XRD microstructural analysis of mullites obtained from kaolinite–alumina mixtures

Saínz, M.A.; Serrano, Francisco; Amigó, José M.; Bastida, J.; Caballero, A. C.

doi:10.1016/s0955-2219(99)00183-1

Cited by 118 publications

(69 citation statements)

References 15 publications

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“…The microstructure is very similar to that obtained by Gnanam et al with South Indian clay (Viswabaskaram et al 2003). Figure 6 is the SEM of bauxite containing samples fired at 1500°C for 2 h. The microstructure shows mullite grain morphology appearing to be a bimodal structure of larger elongated primary mullite crystals with high aspect ratio and smaller, more equiaxed secondary mullite (Liu et al 1991;Sainz et al 2000). The larger mullite crystals with higher aspect ratio corresponded to the primary mullite nucleated in kaolinite and grown in firing.…”

Section: Resultsmentioning

confidence: 99%

Effect of bauxite addition on densification and mullitization behaviour of West Bengal clay

Raut¹,

Biswas²,

Bhattacharya³

et al. 2008

Bull Mater Sci

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The effect of bauxite addition on the densification and mullitization of reaction sintered bauxiteclay mixture had been studied in the temperature range 1400-1500°C. The maximum bulk density (2⋅89 g/cc) and minimum apparent porosity (0⋅58%) was achieved by addition of 50 wt% bauxite. The impurities present in bauxite and clay formed liquid phase which helped in particle diffusion to aid densification. The X-ray diffraction of sample fired at 1500°C showed cristoballite phase gradually disappearing and at the same time mullite and α-Al 2 O 3 phase appearing at a higher level of bauxite addition. The in situ nascent alumina formed was reactive that facilitated the formation of secondary mullite by solution precipitation mechanism. The presence of bauxite also changed the morphology of the mullite particles. Two types of mullite were distinctly observed in the SEM photographs: elongated primary mullite and equiaxed secondary mullite.

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Section: Resultsmentioning

confidence: 99%

Effect of bauxite addition on densification and mullitization behaviour of West Bengal clay

Raut¹,

Biswas²,

Bhattacharya³

et al. 2008

Bull Mater Sci

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“…Several studies carried out on refractory clay materials [1][2][3]8,9] showed that the sintered brick characteristics are influenced by the mineralogical composition of clays and the firing temperature. The firing temperature of brick made using the clays also influences properties, with higher temperatures enhancing densification by the formation of a liquid phase.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…Refractory materials most commonly used for lining furnace walls are synthesized mainly from silica-alumina geomaterials [1][2][3]. The control of the quality of refractory demands a wide knowledge in various scientific fields (geology, mineralogy, geochemistry, thermodynamics, mechanics ···).…”

Section: Introductionmentioning

confidence: 99%

Composition and Refractory Properties of Mixtures of Moroccan Silica-Alumina Geomaterials and Alumina

Sadik¹,

Amrani²,

Albizane³

2013

NJGC

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Five mixtures (M1 to M5) of silica-alumina geomaterials and two varieties of alumina (A P and A R ) were used for the elaboration of mullite refractory materials between 1500˚C and 1600˚C. An X-ray diffraction (XRD) analysis showed that the refractory samples are composed of mullite, corundum and silica. The length of the mullite crystals was measured by a method of image analysis of scanning electron microscopy (SEM). Chemical and mechanical properties of these materials were investigated and correlated with their microstructure. Resistance towards Acid Attack test showed that the refractory samples present good resistance, as well as, the alumina powder A R obtained from waste of silica-alumina bricks proves to be efficient for an eventual use.

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“…7. A variety of XRD peaks to be assigned to mullite (ceramic fiber) [19][20][21], AlPO 4 (inorganic binder) [18,19] and TiO 2 (anatase) [10,17] are observed over the ceramic fiber monolith reactors. No alteration of the XRD patterns for SW (fresh) and SCW monoliths was observed.…”

Section: Characteristics Of the Ceramic Fiber Substratementioning

confidence: 99%

The Hydrothermal Stability of Paper-Like Ceramic Fiber and Conventional Honeycomb-Type Cordierite Substrates Washcoated with Cu-MFI and V2O5/TiO2 Catalysts for the Selective Reduction of NOx by NH3

et al. 2010

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A paper-like ceramic fiber was employed as a monolith substrate for removing NO by NH 3 . The stronger hydrothermal stability of the ceramic fiber washcoated with V 2 O 5 /TiO 2 was observed by the pre-calcination of the substrate, mainly due to the well dispersed AlPO 4 formed on the substrate surface improving the washcoating of the catalysts and moderating the phase transformation of TiO 2 from anatase to rutile.

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XRD microstructural analysis of mullites obtained from kaolinite–alumina mixtures

Cited by 118 publications

References 15 publications

Effect of bauxite addition on densification and mullitization behaviour of West Bengal clay

Effect of bauxite addition on densification and mullitization behaviour of West Bengal clay

Composition and Refractory Properties of Mixtures of Moroccan Silica-Alumina Geomaterials and Alumina

The Hydrothermal Stability of Paper-Like Ceramic Fiber and Conventional Honeycomb-Type Cordierite Substrates Washcoated with Cu-MFI and V2O5/TiO2 Catalysts for the Selective Reduction of NOx by NH3

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