Characterization and Sintering Behavior of Alkoxide‐Derived Aluminosilicate Powders

Hirata, Yoshihiro; Sakeda, Kazuyoshi; Matsushita, Yumi; Shimada, Kinji; Ishihara, Yoshimi

doi:10.1111/j.1151-2916.1989.tb06258.x

Cited by 67 publications

(17 citation statements)

References 28 publications

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“…As it can be seen the spectra of both dried gels display broad bands at low wavenumber, indicating a disordered distribution of aluminum and silicon tetrahedral sites. The band at $1000 cm À1 has been assigned to tetrahedral Al-O-Si bands [21,22], on the basis that introduction of Si-O-Al bonds in a SiO 2 matrix shifted the absorption band of Si-O toward the lower wavenumber. For gels heated at 900°C under slow and medium heating rates also very wide bands are displayed.…”

Section: Infrared Spectra Of As-prepared and Thermally Treated Gelsmentioning

confidence: 99%

Effect of thermal treatment on the structural evolution of 3:2 and 2:1 mullite monophasic gels

Sola¹,

Estevan²,

Torres³

et al. 2005

Journal of Non-Crystalline Solids

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Section: Infrared Spectra Of As-prepared and Thermally Treated Gelsmentioning

confidence: 99%

Effect of thermal treatment on the structural evolution of 3:2 and 2:1 mullite monophasic gels

Sola¹,

Estevan²,

Torres³

et al. 2005

Journal of Non-Crystalline Solids

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“…23) On the other hand, the Al2O3 / SiC sheet may react with the liquid of the SiO2-Al2O3-Yb2O3 system in the densified SiC compact at a temperature above the eutectic temperature during the joining. To investigate the influence of the phases present at a joining temperature, composite D was produced at the temperatures below (1300°C) and above (1600°C) the eutectic temperature (1400°C) of the SiO2-Al2O3-Yb2O3 system.…”

Section: Jcs-japanmentioning

confidence: 99%

Processing, damage tolerance and crack healing in the silicon carbide fabric-covered silicon carbide composite

Arima¹,

Hirata²,

Matsunaga³

et al. 2008

J. Ceram. Soc. Japan

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SiC fabric with or without alumina powder was joined to the surfaces of SiC compact under the applied pressures of 5-39 MPa. The stress-strain curve, strength, damage tolerance using Vickers indentor and crack healing effect were investigated for both the SiC with and without SiC fabric layers. The strength of monolithic SiC was greatly decreased by the surface damage but easily recovered to the original strength by the healing at a relatively low temperature of 1100°C in air. When a simultaneous processing using an SiC compact covered with SiC fabric was applied, which promoted the densification of inside SiC compact, the surface SiC fabric dissolved in the liquid of sintering additives included in the SiC compact during the hotpressing at 1950°C. The mechanical properties of this type composite were similar to those of monolithic SiC compact. The SiC fabric joined to dense SiC compact under a low applied pressure at 1300-1600°C prevented the propagation of the cracks formed by Vickers indentor and showed a significant nonlinear stress-strain curve. As a result, no change in the strength was measured before and after the introduction of cracks. However, increased joining pressure resulted in the creep rupture of dense inside SiC compact. Decrease of the joining temperature and decrease of the joining pressure were effective to increase the flexural strength.

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“…A broad absorption band at 1050 -1100 cm21 and a band at 470 cm 21 ascribed to the Si-O vibrations of amorphous SiO2 21 are observed for the sample calcined at 900 ± C. A shift in the first peak from 1100 to 1050 cm 21 suggests formation, in a certain degree, of Si-O -Al bonds 21,27. A broad absorption band at 1050 -1100 cm21 and a band at 470 cm 21 ascribed to the Si-O vibrations of amorphous SiO2 21 are observed for the sample calcined at 900 ± C. A shift in the first peak from 1100 to 1050 cm 21 suggests formation, in a certain degree, of Si-O -Al bonds 21,27.…”

mentioning

confidence: 93%

Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis

Janaćković¹,

Jokanovic

Kostic-Gvozdenovic³

et al. 1996

J. Mater. Res.

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Submicrometer spherical particles of mullite powder were synthesized by ultrasonic spray pyrolysis of emulsion and solutions, using tetra-ethyl-orthosilicate (TEOS) or silicic-acid and Al(NO3)3 · 9H2O as initial compounds. Crystallization of mullite phase was determined by differential thermal (DT), thermogravimetric (TG), infrared (IR), and x-ray analyses. The synthesis of mullite from TEOS emulsion occurs by crystallization of γ–Al2O3 (or Al, Si-spinel) from the amorphous phase and its subsequent reaction with amorphous SiO2, as well as by crystallization of pseudotetragonal mullite below 1000 °C and its subsequent phase transformation into orthorhombic mullite. In the powders produced from silicic acid solutions, synthesis of mullite occurs only by crystallization of γ–Al2O3 between 900 and 1000 °C and its further reaction with amorphous SiO2 between 1100 and 1200 °C. Particle formation mechanism depended directly on the initial emulsion or solution preparation, i.e., on the phase separation in the emulsion and on the silicic-acid crosslinking conditions.

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Characterization and Sintering Behavior of Alkoxide‐Derived Aluminosilicate Powders

Cited by 67 publications

References 28 publications

Effect of thermal treatment on the structural evolution of 3:2 and 2:1 mullite monophasic gels

Effect of thermal treatment on the structural evolution of 3:2 and 2:1 mullite monophasic gels

Processing, damage tolerance and crack healing in the silicon carbide fabric-covered silicon carbide composite

Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis

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