Thermal properties of homogenous lanthanum hexaaluminate/alumina composite ceramics

Negahdari, Zahra; Willert‐Porada, Monika; Scherm, Florian

doi:10.1016/j.jeurceramsoc.2010.07.026

Cited by 23 publications

(12 citation statements)

References 21 publications

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“…Densification and phase composition Further increase in LA6 content to more than 25 wt% decreases the relative density of the samples. The in situ formation of the LA6 rodlike particles may be the main reason that retarded the densification of the LA6 composites [21] as the geometry of the particles having rodlike shape does not consolidate the particles packing [11]. …”

Section: Resultsmentioning

confidence: 99%

In-situ sintering reaction of Al2O3–LaAl11O18–ZrO2 composite

Naga

Hassan

El-Maghraby

et al. 2016

International Journal of Refractory Metals and Hard Materials

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Section: Resultsmentioning

confidence: 99%

In-situ sintering reaction of Al2O3–LaAl11O18–ZrO2 composite

Naga

Hassan

El-Maghraby

et al. 2016

International Journal of Refractory Metals and Hard Materials

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“…These diffraction peaks belong to a pure single phase of hexaaluminate LaMgAl l1 O 19 (JCPDS 26-0873). The peaks were more intense at 1200 and 1300 o C, which clearly attributed to well-crystallized particles of LaMgAl l1 O 19 compound [9][10][11][12]. …”

Section: Xrd Analysismentioning

confidence: 94%

“…) is to some extent higher than that of YSZ (0.6-2.3Wm −1 K −1 ), however its low Young's modulus, low sinterability, superior structural, thermochemical stability up to 1400 o C, stable pore structure, and lower oxygen diffusivity, draw attentions to investigate (LaMgA ll 1O 19 ) as a candidate material for TBCs [9][10][11][12].The aim of this study is to use tartaric acid gel method, in order to achieve fully crystallized LaMgAl 11 O 19 oxide at relatively low temperature.…”

Section: Introductionmentioning

confidence: 99%

A Novel Technique for Synthesis A Thermal Barrier Coating Material of Lanthanum -Magnesium Hexaaluminate (LaMgAlllO19)

Mohsen¹

2014

IJIRSET

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ABSTRACT:As the advances in some industrial applications are leading to higher operating temperatures; materials of metallic coatings that withstand harsh environments at high temperature are developing. One of the most promising compounds, which can be used as a material for thermal barrier coatings (TBCs) is lanthanum magnesium hexaaluminate (LaMgAl l1 O 19 ).The objective of this study, was to synthesize LaMgAl ll O 19 through a technique of tartaric acid precursor. Effect of different annealing temperature on the microstructure has been studied and reported in the presented research. The annealing temperature was controlled from 900-1300 o C. Kinetic calculations confirmed by the experimental data from the thermal analyses were used to assess the nature of the resultant compound. Interpretation of FT-IR and XRD spectra combined with SEM-EDX observations have identified that a pure single phase was successfully obtained at 1100 o C.

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“…Among them lanthanum aluminates have attracted wide-spread attention in different frontier areas of research due to their outstanding potential in superconductors [2], radiation dosimetry [3], memory devices [4], semiconductor [5], thermal barrier coating [6] and heterogeneous catalysis [7]. In addition, when a mixed metal oxide attains mesoporosity with appreciable good surface area, it can play key role in many industrial applications [8].…”

Section: Introductionmentioning

confidence: 99%

Liquid Phase Benzylation of O-Xylene on Nano Mesoporous Lanthanum Aluminates

Moothedan¹

2018

IJRASET

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Nano lanthanum aluminates synthesized by sol-gel method were used for the liquid phase benzylation of o-xylene (oXyl) with benzyl chloride (BC) in a batch reactor at atmospheric pressure. Lanthanum aluminates were characterized in depth by Differential thermo gravimetric analysis (DTG), Differential scanning calorimetric analysis (DSC), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 sorpometry, transmission electron microscopy (TEM), temperatureprogrammed desorption using CO2/NH3 (CO2-TPD/NH3-TPD) and temperature-programmed reduction using H2 (H2-TPR) in order to relate its performances to the chemical and textural characteristics. Nano La10Al4O21 was detected for lower aluminum precursor concentration and stable nano mesoporous LaAlO3 becomes the major phase as the concentration increases. The band gap of LaAlO3 and La10Al4O21 was estimated from ultraviolet-visible (UV-Vis) spectrophotometry. Ac conductivity and dielectric measurement of lanthanum aluminates were also performed. The effect of catalyst concentration, reaction temperature, reaction time and o-Xyl/BC molar ratio on benzylation of o-Xyl was studied over stable nano mesoporous LaAlO3 and was extended to nano La10Al4O21 at the optimized conditions. LaAlO3 showed 92% and La10Al4O21 showed 51% BC conversion at the following reaction conditions (catalyst to BC (w/w) = 0.1, o-Xyl/BC molar ratio =1:1, 433K, 2h, 1 atm). The acidity and mesoporous structure of LaAlO3 appeared to be responsible for its good performance. Increase in catalyst concentration, reaction temperature and reaction time enhances the conversion of BC, whereas it decreases with the increase in o-Xyl/BC molar ratio. The Friedel-Crafts (FC) benzylation reaction mechanism involves the formation of an electrophile (C6H5CH2 + ) over an acidic lanthanum aluminate catalyst which attacks the O-Xyl ring resulting in the formation of 3,4 -dimethyl diphenyl methane.

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Thermal properties of homogenous lanthanum hexaaluminate/alumina composite ceramics

Cited by 23 publications

References 21 publications

In-situ sintering reaction of Al2O3–LaAl11O18–ZrO2 composite

In-situ sintering reaction of Al2O3–LaAl11O18–ZrO2 composite

A Novel Technique for Synthesis A Thermal Barrier Coating Material of Lanthanum -Magnesium Hexaaluminate (LaMgAlllO19)

Liquid Phase Benzylation of O-Xylene on Nano Mesoporous Lanthanum Aluminates

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