Crystallization studies in mullite and mullite–YSZ beads

Garcia, Ephrahim; Mesquita‐Guimarães, J.; Miranzo, P.; Osendi, M.I.

doi:10.1016/j.jeurceramsoc.2010.04.018

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…2 Due to its incongruent melting and to the rapid cooling, bulk crystallization in the beads did not occur. 12 Extensive mullite crystallization was observed only after heating, either in the TT SASM beads or in the SPS specimens (Fig. 1c).…”

Section: Resultsmentioning

confidence: 94%

“…1c), indicating the formation of the so-called pseudotetragonal mullite. 21 For the 1300 • C SPS specimens, peaks split apart evidencing the formation of the orthorhombic mullite, and similarly for the TT SAMS beads, heat treated at 1300 • C. An estimation of residual amorphous phase in the mullite specimens was obtained from the crystallinity ratio (CR N ), defined as the ratio between the area under the XRD peaks and the area under the whole pattern, normalized to the 1300 • C fully crystallized specimens, 12 giving around 10 wt% of amorphous phase in the case of the 950 • C specimens ( Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…12 It was proved that flame spraying of mullite powders led to beads with very low crystallinity ratio (0.11-0.19, depending on the starting mullite powders) that became completely crystalline when treated at 1300 • C. In that work, the formation of the pseudo-tetragonal mullite was observed for beads treated at 1000 • C.…”

Section: Introductionmentioning

confidence: 86%

See 2 more Smart Citations

Porous mullite templated from hard mullite beads

Garcia¹,

Osendi²,

Miranzo³

2011

Journal of the European Ceramic Society

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Porous mullite templated from hard mullite beads

Garcia¹,

Osendi²,

Miranzo³

2011

Journal of the European Ceramic Society

Self Cite

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“…Mullite, identified by the formula 3Al 2 O 3 •2SiO 2 but existing over a small composition range [13], has been considered as a high-strength phase to enhance reinforce YSZ ceramic [14].Calculation shows that 19.5g Al 2 O 3 for mullite complete formation requires about 7.6g SiO 2 . It is impossible that…”

Section: Results and Analysismentioning

confidence: 99%

Improved Fracture Strength of 5YSZ/Al2O3 Composite Matrix by Addition of SiO2 for Planar Automotive Oxygen Sensor

et al. 2018

KEM

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As the ceramic substrate materials in automobile oxygen sensor, 5YSZ/Al2O3matrix composite ceramic with different amount of silica are prepared by ball-milling,tape casting and sintering.They are investigated for their microstructure and mechanical properties.The microstructure of the sample is analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDX).Fracture strength is measured by ring-on-ring method. It is found that adding 1 wt.% SiO2into 5YSZ/Al2O3matrix can improve the strength of composite ceramics.

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“…All samples displayed characteristic diffraction peaks at 2𝜃 of 26.3°, 35.5°, 41.0°, 49.6°, 54.0°, 57.7°, and 60.9°, indicating the presence of the mullite phase and high stability of SACAs before and after the fire-reborn process. [46][47][48] Even after being exposed to combustion at 1300 °C, the crystal structure of FR-SACAs remained unchanged, demonstrating their excellent thermal stability.…”

Section: Physical Properties Of Sacasmentioning

confidence: 99%

Flexible and Transformable Ceramic Aerogels via a Fire‐Reborn Strategy for Thermal Superinsulation in Extreme Conditions

Cheng,

Ma,

et al. 2023

Adv Funct Materials

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Effective thermal superinsulation in extremely high temperatures (EHT) is crucial for aerospace, industrial, and civilization activities. However, current strategies relying on ceramic materials face limitations due to their high thermal conductivity and brittleness in specific conditions. In this study, a feasible and scalable method for synthesizing a flexible, lightweight, and transformable fire‐reborn silica‐alumina hybrid ceramic aerogel (FR‐SACA) is presented, which is achieved by rearranging silica aerogel microparticles and Al2O3 ceramic fibers using a self‐sacrifice polymer, resulting in a bio‐inspired bird nest structured FR‐SACA. The SACA exhibits exceptional properties, including an ultra‐low density of 0.01 g cm−3, a low thermal conductivity of 0.029 W m−1 K−1, and a reversible compression of up to 80%. Notably, a 20 mm‐thick FR‐SACA demonstrates a remarkable temperature reduction of 1179.6 °C when exposed directly to a 1300 °C flame, suggesting its potential as a thermal superinsulation material in EHT environments. Furthermore, the transformability of SACA enables in situ fabrication on surfaces with diverse heteromorphic structures, such as flat, bent, and angled shapes, thereby providing thermal superinsulation for various constructions. The Phoenix Nirvana process opens up new possibilities for synthesizing ceramic aerogels with desirable flexibility and adaptive properties, facilitating effective thermal management under extreme conditions.

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Crystallization studies in mullite and mullite–YSZ beads

Cited by 10 publications

References 20 publications

Porous mullite templated from hard mullite beads

Porous mullite templated from hard mullite beads

Improved Fracture Strength of 5YSZ/Al<sub>2</sub>O<sub>3</sub> Composite Matrix by Addition of SiO<sub>2</sub> for Planar Automotive Oxygen Sensor

Flexible and Transformable Ceramic Aerogels via a Fire‐Reborn Strategy for Thermal Superinsulation in Extreme Conditions

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