A comparative study of microstructural development in the sol–gel derived alumina–mullite nanocomposites using colloidal silica and tetraethyl orthosilicate

Sedaghat, Ali; Taheri-Nassaj, E.; Sorarù, Gian Domenico; Ebadzadeh, Touradj

doi:10.1007/s10971-011-2446-3

Cited by 11 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As described previously [27], the average grain‐sized were 0.4, 1.4 and 2.2 µm at 1500, 1650 and 1750°C, respectively. At 1750°C, porosity was observed due to sintering (abnormal grain growth) or mullite decomposition [27].…”

Section: Resultsmentioning

confidence: 70%

“…In the previous work [27], the microstructure evolution of the sintered alumina–mullite composite by NS at 1500, 1650 and 1750°C were investigated. As described previously [27], the average grain‐sized were 0.4, 1.4 and 2.2 µm at 1500, 1650 and 1750°C, respectively. At 1750°C, porosity was observed due to sintering (abnormal grain growth) or mullite decomposition [27].…”

Section: Resultsmentioning

confidence: 99%

“…In the previous work [27], the alumina composite nanopowder was synthesised using aluminium chloride hexa‐hydrate [Merck 101084.] and tetra‐ethyl ortho‐silicate [Sigma‐Aldrich 131903.]…”

Section: Methodsmentioning

confidence: 99%

“…Results and discussion: Fig. 1 presents the XRD patterns of the alumina-15 vol% mullite at different temperatures (900-1750°C) [27]. The crystallisation of alpha alumina [30] can be observed at 1000°C and at higher temperatures (1300-1650°C), the peaks of mullite [31] were detected.…”

Section: Experimental Procedurementioning

confidence: 99%

See 3 more Smart Citations

Densification behaviour and microstructure of spark plasma sintered alumina–mullite nanocomposite

Zadeh

Taheri-Nassaj

2019

Micro & Nano Letters

View full text Add to dashboard Cite

Spark plasma sintering (SPS) is a consolidation technique that combines high heating and cooling rates with a uniaxial applied pressure which results in short processing time. SPS is successful in producing ceramics with novel microstructures, which are often reported to be made at temperatures lower than ones used in conventional densification techniques. In this work, the densification and microstructure development sequences of the alumina-15 vol% mullite composite during the SPS and the conventional process were compared. Through SPS technique, the fully dense 0.5 µm grain sized alumina composite (99.5% T.D.) was obtained at 1600°C and its microstructure exhibited nanocrystalline in submicron-sized grains. The nanocrystalline grains were arranged in ground-shaped clusters. Vickers hardness and fracture toughness values for spark plasma sintered composite were calculated as 2098 ± 66 kgf/mm 2 and 3.61 ± 0.06 MPa m 1/2 , respectively.

show abstract

Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Experimental Procedurementioning

confidence: 99%

See 2 more Smart Citations

Densification behaviour and microstructure of spark plasma sintered alumina–mullite nanocomposite

Zadeh

Taheri-Nassaj

2019

Micro & Nano Letters

View full text Add to dashboard Cite

show abstract

“…In this context chelating agents such as monoethanolamine, diethanolamine, triethanolamine, acetic acid, acetylaccetone, ethyacetate, and long-chain carboxylic acids have been used for modification of aluminium alkoxides and decrease of their chemical reactivity [7][8][9][10][11]. The aim for use of these materials is control of the hydrolysis and condensation rates, and preparation of alumina with desired physicochemical properties [12][13][14][15]. It should be mentioned that the chelating agents not only control the rates of hydrolysis and condensation but also determine the final properties of the alumina.…”

Section: Introductionmentioning

confidence: 99%

Modification of Aluminium Alkoxide with Different Long-Chain Chelating Agent: Hydrolysis and Characterization of the Product

Sharbatdaran¹,

Amini

Nourkojouri³

2012

J Clust Sci

View full text Add to dashboard Cite

An aluminum alkoxide, [Al(OCH 2 CH 2 OCH 2 CH 3 ) 3 ] (O 1 ), was synthesized by alcohol exchange method and after characterization by 27 Al NMR, 1 H NMR, infrared spectroscopies and mass spectrometry was used as a precursor for the preparation of high quality c-alumina. c-aluminas also were prepared from [Al(OCH 2 CH 2 OCH 2 CH 2 OCH 3 ) 3 ] (O 2 ) and [Al(OCH 2 CH(CH 3 )CH 3 ) 3 ] (O 3 ) in an identical hydrolysis condition and their textural parameters compared to that of prepared from O 1 . The gels obtained from hydrolysis of aluminum alkoxides by sol-gel processing were characterized by X-ray powder diffraction, thermal analysis, scanning electron microscopy (SEM), and nitrogen adsorption-desorption analysis. The X-ray diffraction patterns showed the materials obtained from hydrolysis of O 1 , O 2 and O 3 are pseudoboehmite and converts to c-alumina by calcinations at 800°C. The alumina obtained from hydrolysis of O 3 showed higher surface area (S BET ), slightly above 200 m 2 /g and lower particle size, about 40-50 nm, than aluminas prepared from the hydrolysis of O 1 and O 2 . SEM showed that morphology of alumina obtained from O 2 is different to a great extent than the ones obtained from other precursors. Moreover, a transparent monolith gel has been prepared from O 1 .

show abstract

Effect of the alumina and silica source mixing procedure on the microstructural evolution of alumina-mullite composite fibers prepared by sol–gel method

Liu,

Zhan,

et al. 2023

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

A comparative study of microstructural development in the sol–gel derived alumina–mullite nanocomposites using colloidal silica and tetraethyl orthosilicate

Cited by 11 publications

References 24 publications

Densification behaviour and microstructure of spark plasma sintered alumina–mullite nanocomposite

Densification behaviour and microstructure of spark plasma sintered alumina–mullite nanocomposite

Modification of Aluminium Alkoxide with Different Long-Chain Chelating Agent: Hydrolysis and Characterization of the Product

Effect of the alumina and silica source mixing procedure on the microstructural evolution of alumina-mullite composite fibers prepared by sol–gel method

Contact Info

Product

Resources

About