Production of Al2O3‐Stabilized Tetragonal ZrO2 Nanoparticles for Thermal Barrier Coating

Karthik, A.; Manivasakan, Palanisamy; Arunmetha, S.; Yuvakkumar, R.; Rajendran, V.

doi:10.1111/ijac.12032

Cited by 23 publications

(14 citation statements)

References 52 publications

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“…The absorption bands above the spectral region of 1000 cm −1 were not observed for any of the chemical treatment conditions of the Al 2 O 3 / ZrO 2 nanocomposites. The absence of the absorption bands in the spectral regions around 3656 cm −1 (stretching vibration of OH physically adsorbed to Al +3 ), at 3447 cm −1 (stretching vibrations of OH groups), around 1638 cm −1 (bending vibrations of H 2 O molecules), around 1070 cm −1 (bending vibration of Al-OH groups) and at~1764/ 1634/~1385 cm −1 (bending vibration of Zr-OH groups) may be explained by the removal of surface water from the Al 2 O 3 /ZrO 2 nanocomposites, resulting in a fully anhydrous crystalline structure [22,23]. The peaks at 640 and 580 cm −1 observed may be attributed to Al-O bending vibrations, whereas the peaks at 621, 475 and 445 cm −1 observed in the same spectra may be assigned to Zr-O.…”

Section: Surface Characterization Of the Al 2 O 3 /5 Vol%zro 2 Nanocomentioning

confidence: 99%

Influence of different chemical treatments on the surface of Al2O3/ZrO2 nanocomposites during biomimetic coating

Santos

Ferreira

Osiro

et al. 2017

Ceramics International

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The objective of this study is to evaluate the influence of different chemical surface treatments (H 3 PO 4 , HNO 3 , and NaOH) in the formation of calcium phosphate phases on the surface of Al 2 O 3 /ZrO 2 (5 vol%) nanocomposite. For this purpose, Al 2 O 3 /ZrO 2 samples were shaped, calcined at 400°C, sintered at 1500°C, subjected to different chemical treatments, and biomimetically coated from 14 to 21 days. Surface characterization was performed by scanning electron microscopy, atomic force microscopy, confocal microscopy, X-ray diffraction, and infrared spectroscopy. It was observed that the preliminary chemical treatment favored the formation of particular calcium phosphate phases of interest, such as α-TCP (alpha-tricalcium phosphate), β-TCP (betatricalcium phosphate), and HA (hydroxyapatite). The differences among the percentages of the phases formed affected the homogeneity of calcium phosphate distribution within the nanocomposites as well as the roughness of the formed layer, effectively contributing to adhesion, proliferation, and desired cell biofixation on bone implant.

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Section: Surface Characterization Of the Al 2 O 3 /5 Vol%zro 2 Nanocomentioning

confidence: 99%

Influence of different chemical treatments on the surface of Al2O3/ZrO2 nanocomposites during biomimetic coating

Santos

Ferreira

Osiro

et al. 2017

Ceramics International

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“…Sintering at 1400 • C resulted in a complete transformation of the monoclinic to tetragonal phase for series IV. Note that the presence of a tetragonal variety of ZrO 2 increases the temperature stability of the material in operating conditions, e.g., as thermal barrier materials [44]. As early as the late 1970s and early 1980s, several researchers showed in their work that, for both solid materials and coatings, materials containing the tetragonal variety of ZrO 2 exhibit greater mechanical strength, particularly against fracture, than those containing the monoclinic or regular variety [45][46][47].…”

Section: Resultsmentioning

confidence: 99%

Sintering Behavior, Thermal Expansion, and Environmental Impacts Accompanying Materials of the Al2O3/ZrO2 System Fabricated via Slip Casting

et al. 2021

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This work focuses on research on obtaining and characterizing Al2O3/ZrO2 materials formed via slip casting method. The main emphasis in the research was placed on environmental aspects and those related to the practical use of ceramic materials. The goal was to analyze the environmental loads associated with the manufacturing of Al2O3/ZrO2 composites, as well as to determine the coefficient of thermal expansion of the obtained materials, classified as technical ceramics. This parameter is crucial in terms of their practical applications in high-temperature working conditions, e.g., as parts of industrial machines. The study reports on the four series of Al2O3/ZrO2 materials differing in the volume content of ZrO2. The sintering process was preceded by thermogravimetric measurements. The fabricated and sintered materials were characterized by dilatometric study, scanning electron microscopy, X-ray diffraction, and stereological analysis. Further, life cycle assessment was supplied. Based on dilatometric tests, it was observed that Al2O3/ZrO2 composites show a higher coefficient of thermal expansion than that resulting from the content of individual phases. The results of the life cycle analysis showed that the environmental loads (carbon footprint) resulting from the acquisition and processing of raw materials necessary for the production of sinters from Al2O3 and ZrO2 are comparable to those associated with the production of plastic products such as polypropylene or polyvinyl chloride.

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“…This indicates that the CTFO as polycrystalline nanomaterial has merely faced transition in this temperature [48,[50][51][52]. Some reports have shown that CaTiO 3 has assorted kinds of phase transition at intermediate temperatures (from 536 to 1348°C) with useful crystal structures and super lattice inhibitions [53,54].…”

Section: Powder Characterisationmentioning

confidence: 96%

Effect of temperature on the electrical properties of nanocrystalline CaTi1−x Fe x O3−Δ perovskite

Mathu¹,

Nehru²,

Vinoth³

et al. 2015

J Mater Sci: Mater Electron

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Calcium titanate nanopowder doped with high content (1 M%) of iron was synthesized using simple sol-gel method. The four obtained samples were post-sintered at 100, 500, 900, and 1250°C to get soft agglomerates of nanocrystalline perovskites, which were deagglomerated by wet milling process using ethanol as a medium. The general stoichiometric formula for iron-doped CaTiO 3 was symbolized as CaTi 1-x Fe x O 3-d . The crystallographic structure of perovskites was found to be orthorhombic for all the four samples. The real and imaginary parts of the impedance values of sintered samples as a function of frequency were obtained using complex impedance spectroscopy. All the instrumental parameters were calibrated before initiating the measurements. The frequency range was set between 0.01 Hz and 1 MHz, and AC bias voltage was maintained at 50 mV. The objective of this work was to find the economical relevance of pioneering materials for electronic applications such as hydrogen production in fuel cells, solar plant, ferroelectric memory devices, microwave resonators, and sensible membranes as they are cheap and readily available, and can be prepared using controllable synthesis in a commercial laboratory.

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Production of Al₂O₃‐Stabilized Tetragonal ZrO₂ Nanoparticles for Thermal Barrier Coating

Cited by 23 publications

References 52 publications

Influence of different chemical treatments on the surface of Al2O3/ZrO2 nanocomposites during biomimetic coating

Influence of different chemical treatments on the surface of Al2O3/ZrO2 nanocomposites during biomimetic coating

Sintering Behavior, Thermal Expansion, and Environmental Impacts Accompanying Materials of the Al2O3/ZrO2 System Fabricated via Slip Casting

Effect of temperature on the electrical properties of nanocrystalline CaTi1−x Fe x O3−Δ perovskite

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