Microstructure and room temperature mechanical properties of mullite fibers after heat-treatment at elevated temperatures

Wang, Yi; Cheng, Haifeng; Liu, Haitao; Wang, Jun

doi:10.1016/j.msea.2013.04.089

Cited by 49 publications

(26 citation statements)

References 24 publications

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“…The measured Young's modulus and hardness of the AS fiber as a function of sintering temperature is shown in Figure A. At 800 and 1000°C, the Young's modulus of the AS fiber was ≈156 GPa, in consistent with what was reported by the filament tensile tests, and compared well with the provided value for the as‐received fiber . This suggests a stable microstructure of the AS fiber at this temperature range.…”

Section: Resultssupporting

confidence: 83%

“…Note the phase transition mechanism was different for each component. The phase transition occurring in the AS fiber was mainly due to a phase reaction between the amorphous SiO 2 and γ‐Al 2 O 3 at 1200°C, with the formation of a crystallized mullite phase (3Al 2 O 3 ·2SiO 2 ) in the AS fiber . Instead, a phase transition from γ‐Al 2 O 3 to α‐Al 2 O 3 was observed at 1200°C in the Al 2 O 3 matrix .…”

Section: Resultsmentioning

confidence: 99%

“…However, the measured hardness was still decreased to ≈9.6 GPa. This can be explained by the formation of mullite phase and the grain growth of mullite at 1200°C …”

Section: Resultsmentioning

confidence: 99%

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A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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A novel methodology combining multiscale mechanical testing and finite element modeling is proposed to quantify the sintering temperature‐dependent mechanical properties of oxide matrix composites, like aluminosilicate (AS) fiber reinforced Al2O3 matrix (ASf/Al2O3) composite in this work. The results showed a high‐temperature sensitivity in the modulus/strength of AS fiber and Al2O3 matrix due to their phase transitions at 1200°C, as revealed by instrumented nanoindentation technique. The interfacial strength, as measured by a novel fiber push‐in technique, was also temperature‐dependent. Specially at 1200°C, an interfacial phase reaction was observed, which bonded the interface tightly, as a result, the interfacial shear strength was up to ≈450 MPa. Employing the measured micro‐mechanical parameters of the composite constituents enabled the prediction of deformation mechanism of the composite in microscale, which suggested a dominant role of interface on the ductile/brittle behavior of the composite in tension and shear. Accordingly, the ASf/Al2O3 composite exhibited a ductile‐to‐brittle transition as the sintering temperature increased from 800 to 1200°C, due to the prohibition of interfacial debonding at higher temperatures, in good agreement with numerical predictions. The proposed multiscale methodology provides a powerful tool to study the mechanical properties of oxide matrix composites qualitatively and quantitatively.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

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A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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“…The average crystallite size (D t ) of YSZ powders was determined from broadening of the diffraction line (101) of the tetragonal phase using the Scherrer equation (Eq. (1)) [18,19]:…”

Section: Characterization Of the Ysz Powdersmentioning

confidence: 99%

Effect of Y2O3 addition on the phase composition and crystal growth behavior of YSZ nanocrystals prepared via coprecipitation process

Zhou

Yuan

Huang

et al. 2015

Ceramics International

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“…This work aimed to prepare a new composite with similar dielectric properties to but higher thermal stability than SiO 2f /SiO 2 composites. Aluminosilicate (AS) fibers display the same mechanical and dielectric properties as, but higher thermal stability than, silica fibers . Thus, AS fiber‐reinforced silica matrix (AS f /SiO 2 ) composites can overcome the problems of SiO 2f /SiO 2 composites.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of an oxide fiber‐reinforced silica matrix composite

Gao

Zhang

Chen

et al. 2017

Int J Applied Ceramic Tech

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Oxide (Nextel™ 440) fiber‐reinforced silica composites, with the density and porosity of 1.97 g/cm3 and 21.8%, were prepared through sol‐gel. Their average flexure strength, elastic modulus, shear strength, and fracture toughness at room temperature were 119.7 MPa, 25.6 GPa, 10.8 MPa, and 4.0 MPa·m1/2, respectively. The composites showed typical toughened fracture behavior, and distinct pullout fibers were observed at the fracture surface. Their mechanical properties were performant up to 1000°C, with the maximum flexural strength of 132.2 MPa at 900°C. Moreover, the composites showed good thermal stability, even after thermal aging and thermal shock at elevated temperatures.

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Microstructure and room temperature mechanical properties of mullite fibers after heat-treatment at elevated temperatures

Cited by 49 publications

References 24 publications

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

Effect of Y2O3 addition on the phase composition and crystal growth behavior of YSZ nanocrystals prepared via coprecipitation process

Preparation and properties of an oxide fiber‐reinforced silica matrix composite

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