Effects of Na<sub>2</sub>O on the Thermal Shock Resistance of Aluminosilicate Refractory Ceramics

Soboyejo, Winston O.; Akpan, E.; Bashir, Ishmael; Zimba, J.; Hosannah, N.; Allameh, Seyed M.

doi:10.1080/10426910601062248

Cited by 5 publications

(5 citation statements)

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“…The microstructure of such systems can also be changed by varying the compositions and particle sizes in ways that promote different levels of viscoelastic toughening. This may involve the addition of alkali metals such as Na [12] which change the viscosity-temperature characteristics, or the use of different silica/mullite volume fractions to vary the viscoelastic shielding parameters.…”

Section: Discussionmentioning

confidence: 99%

Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic

et al. 2010

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This paper presents the results of a combined experimental and theoretical study of microstructure and thermal shock resistance of an aluminosilicate ceramic. Shock-induced crack growth is studied in sintered structures produced from powders with different particle size ranges. The underlying crack/microstructure interactions and toughening mechanisms are elucidated via scanning electron microscopy (SEM). The resulting crack-tip shielding levels (due to viscoelastic crack bridging) are estimated using fracture mechanics concepts. The implications of the work are discussed for the design of high refractory ceramics against thermal shock.

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Section: Discussionmentioning

confidence: 99%

Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic

et al. 2010

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“…Introduction Mullite (or 3Al 2 O 3 · 2SiO 2 ) has been recognized as an outstanding ceramic material, for its high temperature strength, creep resistance, thermal and chemical stability, low thermal expansion coefficient, and good dielectric properties [1][2][3]. An important potential application of mullite is that as fiber reinforcement.…”

Section: Preparation Of Mullite Fibers By Sol-gel Process and Study Omentioning

confidence: 99%

“…Results and discussion AL was prepared while the reaction took place between AN and lactic acid in aqueous solution during the stirring and heating. The main chemical reactions can be simplified as the following equations, (1) and (2), though the actual reactions were complex: 3CH 3 CH(OH)COOH + Al NO 3 3 → Al CH 3 CH OH COO 3 + 3HNO 3 (1)…”

Section: Characterization Techniquesmentioning

confidence: 99%

Preparation of Mullite Fibers by Sol-Gel Process and Study of Their Morphology

Tan

Guo

2011

Materials and Manufacturing Processes

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Mullite fibers were prepared by sol-gel method using aluminum lactate (AL) and tetraethylorthosilicate (TEOS). The AL was prepared by mixing aluminum nitrate and lactic acid in molar ratio of 1:3. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were used to characterize the properties of the gel and ceramic fibers. The gel fibers completely transformed to mullite fibres at 1200 C. The morphologies of fiber were affected by the diameter size, while the fibers were sintered with a heating rate of 10 C/min. The mullite fibers were obtained with smooth surface for 33 and 42 micro meter diameter fibers. But shots and cracks were observed on fiber surface when the fiber diameter was 46 m.

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“…There is, however, a marked difference in their crystal structures and properties. Above 1250 °C, kyanite is converted to mullite (3Al 2 O 3 •SiO 2 ) and free silica (SiO 2 ), and SiO 2 provides the structure of the viscoelastic toughening [9,10]. K 2 O, Na 2 O and CaO oxides of natural kyanite were known to alter the viscosity and the glass transition temperature of silicates.…”

Section: Introductionmentioning

confidence: 99%

“…K 2 O, Na 2 O and CaO oxides of natural kyanite were known to alter the viscosity and the glass transition temperature of silicates. At lower temperature in the aluminosilicates refractory, K 2 O, Na 2 O and CaO promote the formation of viscous glassy phase and strengthen the viscous ligaments formed [10]. Kyanite crystallizes in triclinic system and starts decomposition only at temperature > 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

Semi-vitrified porous kyanite mullite ceramics: Young modulus, microstructure and pore size evolution

et al. 2019

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Microporous porcelain formulations are successfully carried out through sintering processing. During the thermal treatment of ceramic products, it was found that the addition of kyanite together with ϕand γ-Al 2 O 3 allowed to enhance interconnected pores network with micrometric size from 0.1 to 9 µm in a semi-vitrified composite. Between 1200 and 1350 °C, the mullitization of kyanite hindered the extension of vitrification and the growth of acicular mullite from the transformation of metakaolin. The main pores size decreased from 4.33 to 1.54 µm for the formulation containing 32 wt% of kyanite. In this interval the specific pore area increased from 0.64 to 8.75 m 2 g −1 due to the total conversion of the kyanite to fibrous and acicular mullite that reduced the voids provided by the earlier mullitization. The improvement in the mullitization without extensive vitrification and grain growth and the reduction of the pores size with the increase in the specific pore area contributed to the formation of a microporous matrix with the Young's modulus increased from 7 to > 20 GPa. The microstructure of the microporous porcelain, their specific pore area and pores size as well as the interconnection of pores was found innovative for the applications in the field of engineering filtration where high mechanical strength, strain, stiffness and pressure resistance are required.

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Effects of Na₂O on the Thermal Shock Resistance of Aluminosilicate Refractory Ceramics

Cited by 5 publications

References 13 publications

Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic

Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic

Preparation of Mullite Fibers by Sol-Gel Process and Study of Their Morphology

Semi-vitrified porous kyanite mullite ceramics: Young modulus, microstructure and pore size evolution

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Effects of Na2O on the Thermal Shock Resistance of Aluminosilicate Refractory Ceramics

Cited by 5 publications

References 13 publications

Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic

Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic

Preparation of Mullite Fibers by Sol-Gel Process and Study of Their Morphology

Semi-vitrified porous kyanite mullite ceramics: Young modulus, microstructure and pore size evolution

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Effects of Na₂O on the Thermal Shock Resistance of Aluminosilicate Refractory Ceramics