Dilatometry analysis of the sintering process of nanostructured gadolinia-doped ceria

Batista, Rafael M.; Muccillo, E.N.S.

doi:10.1007/s10973-016-5674-5

Cited by 10 publications

(8 citation statements)

References 18 publications

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“…Ceramics from ZrO 2 -RE 2 O 3 system attracts scientific attention, particularly in terms of synthesis and sintering of nano-powders [1,2]. Rare earth zirconates are promising group of ceramic materials with very high application potential including, e.g., ceramic insulation layers in thermal barrier coatings (TBC) systems.…”

Section: Introductionmentioning

confidence: 99%

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

Jucha

Moskal

Mikuśkiewicz

et al. 2016

J Therm Anal Calorim

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The synthesis of ceramic materials based on europia-zirconia system and obtained by solid-state reaction in high-temperature vacuum press was investigated. Firstly, phase composition and calorimetric behavior of feedstock powders was investigated. The second part of the paper concerns the synthesis process of non-stoichiometric mixtures of feedstock powders prepared by four different methods of mixing. The influence of the homogenization method on the calorimetric behavior and phase composition of obtained sinters was studied. Finally, the influence of the additional high-temperature annealing was also investigated. From the obtained results, it can be concluded that the mixing procedure had a very strong influence on the morphology of obtained sinters. This is due to the structural inhomogeneity, as indicated by differences in phase composition. The synthesis process has a gradual character, and the obtaining of materials with different level of homogeneity allowed the determination of the order of subsequent intermediate phase formation.

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Section: Introductionmentioning

confidence: 99%

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

Jucha

Moskal

Mikuśkiewicz

et al. 2016

J Therm Anal Calorim

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“…Table summarizes the density of as‐pressed and as‐annealed GDC samples. It is noted that the density of the samples conventionally sintered at 800°C for 5 hours were higher than in the prior work . The density of the samples with HNO 3 /H 2 O 2 solution was larger than the ones without the mixture.…”

Section: Resultsmentioning

confidence: 56%

“…It is noted that the density of the samples conventionally sintered at 800°C for 5 hours were higher than in the prior work. 41 The density of the samples with HNO 3 / H 2 O 2 solution was larger than the ones without the mixture. The density of the sample annealed using two-step profile in this work was similar to the density of GDC with Ga 2 O 3 -addition in prior work despite the temperature of the dwell step being lower than the prior work.…”

Section: Methodsmentioning

confidence: 91%

Solvent‐deficient method lowers grain‐boundary resistivity of doped ceria

2019

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Nanoparticles of gadolinium‐doped cerium oxide (GDC) were synthesized using solvent‐deficient method and their sinterability and electrical properties were investigated using the powder and cold sintering process. The GDC powder was uniaxially pressed into cylindrically‐shaped pellets with a mixture of nitric acid and hydrogen peroxide at 200°C to encourage particle arrangement during forming process. These bulk samples were annealed using two different temperature profiles: at 800°C for 5 hours and at 1300°C for 1 minute—800°C for 5 hours. The samples produced using HNO3/H2O2 mixture showed higher relative density than ones without it. Ionic conductivity of the sample sintered through the two‐step profile was obtained from electrochemical impedance spectroscopy. Although the grain conductivity for the samples (8.0 × 10−3 S cm−1 at 500°C, and 3.3 × 10−2 S cm−1 at 700°C) is on par with a conventionally sintered sample, the measured total conductivity (3.9 × 10−3 S cm−1 at 500°C, and 2.5 × 10−2 S cm−1 at 700°C) is about 10 times higher than the conventionally sintered one and is comparable to the values seen in the previous studies for GDC which employed higher sintering temperature, pointing to the effectively lower grain‐boundary impedance. This result could be attributed to no significant phase segregation along grain boundaries due to the low‐temperature processing.

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“…Density variation on the dilatometer, during the sintering of each composite, was calculated assuming the isotropic shrinkage and that there is no change of mass during the process. The apparent density ( D a ) was calculated by the Equation () 27,28 :

D_{normala} = \frac{D_{g}}{{(1 - \frac{Δ L}{L_{o}})}^{3}},

where Δ L is the linear displacement and L o is the initial length. The theoretical density (TD) was calculated by the mixing rule, and relative densities (%TD) of the composite were computed.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and mechanical properties of Al₂O₃/ZrO₂ composites by two‐step sintering

Ojaimi

Ferreira

Chinelatto

et al. 2020

Int J Applied Ceramic Tech

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Composites of Al2O3/ZrO2 (containing 25, 50, and 75 vol% ZrO2) were prepared by mixing Al2O3 and ZrO2 suspensions. The microstructural control via two‐step sintering (TSS) was the main objective of this work. For this purpose, different sintering curves were constructed, aiming to achieve the best temperature combination for the sintering steps that provides higher density and finer microstructure. The results were compared with single‐step sintering (SSS). Furthermore, microhardness and fracture toughness were measured for the best TSS specimens under each composition. The results showed that the high densities were obtained, and the reduction of grain size was greater than 40% for two‐step sintered specimens, compared to SSS ones. Consequently, microhardness values increased. However, fracture toughness values remained unchanged.

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Dilatometry analysis of the sintering process of nanostructured gadolinia-doped ceria

Cited by 10 publications

References 18 publications

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

Solvent‐deficient method lowers grain‐boundary resistivity of doped ceria

Microstructure and mechanical properties of Al₂O₃/ZrO₂ composites by two‐step sintering

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Dilatometry analysis of the sintering process of nanostructured gadolinia-doped ceria

Cited by 10 publications

References 18 publications

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

Solvent‐deficient method lowers grain‐boundary resistivity of doped ceria

Microstructure and mechanical properties of Al2O3/ZrO2 composites by two‐step sintering

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Microstructure and mechanical properties of Al₂O₃/ZrO₂ composites by two‐step sintering