Thermal stability and strain sensitivity of nanostructured aluminum titanate (Al2TiO5)

Keyvani, Negar; Azarniya, Abolfazl; Hosseini, Hamid Reza Madaah; Abedi, Mohammad; Moskovskikh, Dmitry

doi:10.1016/j.matchemphys.2018.10.060

Cited by 36 publications

(13 citation statements)

References 28 publications

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“…According to the previous discussion, the complete reaction from initial titania and alumina to AT can be guaranteed with a sintering temperature higher than 1450 • C. The detected TiO 2 phase in these 1550 • C sintered A-AT composites could be formed due to a partial decomposition of the AT phase during cooling. It is well known that pure synthetized AT is thermally unstable in the temperature range of 800-1280 • C. It tends to decompose, through a eutectoid reaction, into α-Al 2 O 3 and TiO 2 (rutile) during cooling from sintering treatments [13,39]. This brings disadvantage for the material, such as reduced thermal shock resistance.…”

Section: Phase Composition and Microstructurementioning

confidence: 99%

Effect of Al2TiO5 Content and Sintering Temperature on the Microstructure and Residual Stress of Al2O3–Al2TiO5 Ceramic Composites

et al. 2021

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A series of Al2O3–Al2TiO5 ceramic composites with different Al2TiO5 contents (10 and 40 vol.%) fabricated at different sintering temperatures (1450 and 1550 °C) was studied in the present work. The microstructure, crystallite structure, and through-thickness residual stress of these composites were investigated by scanning electron microscopy, X-ray diffraction, time-of-flight neutron diffraction, and Rietveld analysis. Lattice parameter variations and individual peak shifts were analyzed to calculate the mean phase stresses in the Al2O3 matrix and Al2TiO5 particulates as well as the peak-specific residual stresses for different hkl reflections of each phase. The results showed that the microstructure of the composites was affected by the Al2TiO5 content and sintering temperature. Moreover, as the Al2TiO5 grain size increased, microcracking occurred, resulting in decreased flexure strength. The sintering temperatures at 1450 and 1550 °C ensured the complete formation of Al2TiO5 during the reaction sintering and the subsequent cooling of Al2O3–Al2TiO5 composites. Some decomposition of AT occurred at the sintering temperature of 1550 °C. The mean phase residual stresses in Al2TiO5 particulates are tensile, and those in the Al2O3 matrix are compressive, with virtually flat through-thickness residual stress profiles in bulk samples. Owing to the thermal expansion anisotropy in the individual phase, the sign and magnitude of peak-specific residual stress values highly depend on individual hkl reflection. Both mean phase and peak-specific residual stresses were found to be dependent on the Al2TiO5 content and sintering temperature of Al2O3–Al2TiO5 composites, since the different developed microstructures can produce stress-relief microcracks. The present work is beneficial for developing Al2O3–Al2TiO5 composites with controlled microstructure and residual stress, which are crucial for achieving the desired thermal and mechanical properties.

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Section: Phase Composition and Microstructurementioning

confidence: 99%

Effect of Al2TiO5 Content and Sintering Temperature on the Microstructure and Residual Stress of Al2O3–Al2TiO5 Ceramic Composites

et al. 2021

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“…They also found that the thermal instability of Al 2 TiO 5 -based ceramics reached its maximum level at around 1100°C. This thermal instability is responsible for the decomposition of Al 2 TiO 5 into Al 2 O 3 and TiO 2 [22].…”

Section: Phase Composition and Grain Sizementioning

confidence: 99%

Formation, Phase Stability, and Characterization of Unstabilized Aluminum Titanate (Al2TiO5) Ceramics

Hassan

Naga

Awaad

et al. 2021

Preprint

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In the present study, Al2TiO5 was prepared via the sol–gel technique then sintered at 1000°C to 1300°C for 1 h. The thermal stability of the formed ceramic bodies was explored. The densification parameters, microstructure, and phase composition of the sintered Al2TiO5 ceramic were examined, and the mechanical properties and thermal coefficient were characterized. The phase composition study revealed the presence of alumina and TiO2 residuals up to 1100°C. Phase stability was observed in Al2TiO5 bodies sintered up to 1300°C. The vitrification behavior of the bodies was improved by increasing the sintering temperature. The thermal expansion coefficient of the sintered samples sintered at 1300°C was enhanced by the formation of rod-like Al2TiO5 grains. Increases in the bending strength (from 22.40 to 28.90 MPa) and hardness (HV0.1; from 1467 to 1873) were observed when the treatment temperature was increased from 1000°C to 1300°C.

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“…5) contains the peaks at 2ª = 18.9, 26.6, 28.1, 33.7, 38.0, 42.0, 42.6, 47.7, 50.7, 54.1, 57.0, 58.3, 62.4, 67.9, and 72.1°assigned to ATO phase. 15) Moreover, a minor peak at 2ª = 25.2°was identified to anatase TiO 2 . 16) The crystalline size of ATO calculated by Scherrer equation 17) at 2ª = 26.6°was approximately 33.6 nm.…”

Section: Characteristics Of Ato-700-3mentioning

confidence: 99%

A Low Temperature Fabrication and Photoactivity of Al<sub>2</sub>TiO<sub>5</sub> in Cinnamic Acid Degradation

Trung

Tri

et al. 2019

Mater. Trans.

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Aluminum titanate was fabricated by sol-gel method using aluminium nitrate, titanium isopropoxide as precursors and citric acid as a complexing reagent. Effects of calcination temperature, citric acid content and calcination duration on the formation of Al 2 TiO 5 (ATO) phase were investigated by X-ray diffraction. The results showed that the ATO-rich mixture with traces of anatase TiO 2 was obtained at low calcination temperature (700°C). The properties of obtained ATO were characterized by various methods such as FTIR, N 2 isotherm adsorption, DRS, SEM, TEM, and TGA. The point of zero charge of sample was also determined by salt addition method. Owning band gap energy of 3.42 eV the nanostructured ATO could be activated by UV light to become photocatalyst. Indeed, at favorable reaction conditions, detected from the experiment, the obtained ATO gave the photodegradation efficiency of cinnamic acid (CA) approximately 90% after 6 h. ATO also showed high stability and easily separated from solution, consequently after 9 times of reusing the CA degradation extent lightly decreased about 20%.

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Thermal stability and strain sensitivity of nanostructured aluminum titanate (Al2TiO5)

Cited by 36 publications

References 28 publications

Effect of Al2TiO5 Content and Sintering Temperature on the Microstructure and Residual Stress of Al2O3–Al2TiO5 Ceramic Composites

Effect of Al2TiO5 Content and Sintering Temperature on the Microstructure and Residual Stress of Al2O3–Al2TiO5 Ceramic Composites

Formation, Phase Stability, and Characterization of Unstabilized Aluminum Titanate (Al2TiO5) Ceramics

A Low Temperature Fabrication and Photoactivity of Al<sub>2</sub>TiO<sub>5</sub> in Cinnamic Acid Degradation

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