Development of a master sintering curve for ThO2

Kutty, T.R.G.; Khan, K.B.; Hegde, P.V.; Banerjee, Joydipta; Sengupta, Arijit; Majumdar, S.; Kamath, H.S.

doi:10.1016/j.jnucmat.2004.02.007

Cited by 55 publications

(27 citation statements)

References 32 publications

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“…One can then assumet hat it corresponds both to the densification of the pellet and to grain growth processes which are enhanced due to the nanosized charactero ft he starting powder.A lso, one can note that between 1200 and 1500 8C, the densification of Ce-based solid solutionsp roceeded faster than for thoria-based materials, which can be assigned to the higher sintering temperature generally reported for ThO 2 (i.e. in the 1500-1600 8Cr ange) [41] compared to CeO 2 (around 1400 8C). [42] However,t he densification of both samples was not completed at 1600 8C, meaning that highert emperature of heat treatment and/or longerh olding time are required to obtain highly dense samples.…”

Section: Sinteringcapabilitymentioning

confidence: 85%

Synthesis and Direct Sintering of Nanosized (M^IV,M^III)O_2‐x Hydrated Oxides as Electrolyte Ceramics

et al. 2017

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Highly reactive and nanosized Th1‐xYxO2‐x/2 or Ce0.8Ln0.2O1.9 mixed oxides were prepared through the initial precipitation of hydroxide precursors which were further dried under vacuum. Whatever the chemical system investigated, the characterization of the powdered samples evidenced a rapid aging process leading to hydrated oxides. The thermal behavior of these samples was further investigated and first showed a two‐step dehydration process, with the successive departure of adsorbed and constitutive water, both yielding a drastic drop of the powders’ reactivity (i.e. decrease of the specific surface area). Sintering experiments were then undertaken by starting directly from raw powders and revealed very rapid densification kinetics. Highly densified pellets (above 95 %TD) with a fine grain microstructure were obtained after only 1 hour of heat treatment at 1600 °C. This easy and versatile process of precipitation, that can be followed by direct densification of the powders, then appears as a promising option for the elaboration of homogenous ceramic electrolytes.

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Section: Sinteringcapabilitymentioning

confidence: 85%

Synthesis and Direct Sintering of Nanosized (M^IV,M^III)O_2‐x Hydrated Oxides as Electrolyte Ceramics

et al. 2017

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“…The combined stage sintering models relates the linear shrinkage rate of a compact at any given instant to the grain boundary and volume diffusion coefficients, the surface tension and certain aspects of the instantaneous microstructure of the compact. According to the literature [5] the linear shrinkage rate is related to the densification rate. Consequently, the MSC can be generated from the measured densities as a function of H parameter defined by the equation [5]:…”

Section: Introductionmentioning

confidence: 99%

“…According to the literature [5] the linear shrinkage rate is related to the densification rate. Consequently, the MSC can be generated from the measured densities as a function of H parameter defined by the equation [5]:…”

Section: Introductionmentioning

confidence: 99%

“…Then, data from each heating rate are plotted simultaneously as density versus log H and fitted with a proper function usually a sigmoid. If a large v reduced 2 value is obtained, then the activation energy may be inappropriate and the fitting must be repeated with more suitable activation energy (E) value that minimizes v reduced 2 [5]. In the present study, master sintering curves have been calculated for gadolinia-doped ceria nanopowders produced by a soft chemical method.…”

Section: Introductionmentioning

confidence: 99%

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Master sintering curve for Gd-doped CeO2 solid electrolytes

Florio

Esposito

Traversa

et al. 2009

J Therm Anal Calorim

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The sintering behavior of gadolinia-doped ceria powders was studied by the master sintering curve (MSC). Dilatometric analyses of powders produced by a soft chemical method were performed to provide the experimental data set for the construction of the MSC. The assumed model provided good fittings of the MSC and the activation energy for the sintering of Ce 1-x Gd x O 3-d , with x = 0, 0.05, 0.1, and 0.2 were found to be in the 218-325 KJ/mol range, depending on the dopant content. The results supported that both the nanometric size of the particles and the difference in ionic radii between Gd 3? and Ce 4? affects the sintering of Gd-doped CeO 2 .

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“…Sintering kinetics has been studied from the early 1940s quite extensively in the field of powder metallurgy, [15][16][17][18][19][20][21][22][23][24][25] whereas those of iron ore [26,27] have been relatively less. It can be noted that unlike conventional powder processing where the objective is to achieve close to complete densification, in iron ore sintering, the objective is to achieve sintering enough to provide sufficient strength during handling and subsequent operation in iron making furnaces.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Sintering Kinetics of Magnetite Pellet Using Optical Dilatometer

Kumar

Viswanathan

Ahmed

et al. 2015

Metall Mater Trans B

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During induration of magnetite pellets, oxidation of magnetite followed by sintering of the oxidized magnetite (hematite) is desirable. Sintering of magnetite which hampers the oxidation of magnetite is aimed to be kept as low as possible. In succession to our earlier study on sintering behavior of oxidized magnetite (hematite), this paper focusses on the sintering behavior of magnetite phase in isolation with an objective to estimate their kinetic parameters. The pellets prepared from the concentrate of LKAB's mine, which majorly contains (>95 pct) magnetite, are used for the sintering studies. Optical Dilatometer is used to capture the sintering behavior of the magnetite pellet and determine their isothermal kinetics by deducing the three parameters, namely-activation energy (Q), pre-exponential factor (K¢), and time exponent (n) with the help of power law and Arrhenius equation. It is interesting to find that the time exponent (n) is decreasing with the increase in sintering temperature. It is also interesting to note that the activation energy for sintering of magnetite pellet shows no single value. From the present investigation, two activation energies-477 kJ/mole [1173 K to 1373 K (900°C to 1100°C)] and 148 kJ/mole [1373 K to 1623 K (1100°C to 1350°C)]-were deduced for sintering of magnetite, suggesting two different mechanisms operating at lower and other at higher temperatures. The estimated kinetic parameters were used to predict the non-isothermal sintering behavior of magnetite using the sintering kinetic model. Predicted results were validated using experimental data.

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Development of a master sintering curve for ThO2

Cited by 55 publications

References 32 publications

Synthesis and Direct Sintering of Nanosized (M^IV,M^III)O_2‐x Hydrated Oxides as Electrolyte Ceramics

Synthesis and Direct Sintering of Nanosized (M^IV,M^III)O_2‐x Hydrated Oxides as Electrolyte Ceramics

Master sintering curve for Gd-doped CeO2 solid electrolytes

Estimation of Sintering Kinetics of Magnetite Pellet Using Optical Dilatometer

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Development of a master sintering curve for ThO2

Cited by 55 publications

References 32 publications

Synthesis and Direct Sintering of Nanosized (MIV,MIII)O2‐x Hydrated Oxides as Electrolyte Ceramics

Synthesis and Direct Sintering of Nanosized (MIV,MIII)O2‐x Hydrated Oxides as Electrolyte Ceramics

Master sintering curve for Gd-doped CeO2 solid electrolytes

Estimation of Sintering Kinetics of Magnetite Pellet Using Optical Dilatometer

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Synthesis and Direct Sintering of Nanosized (M^IV,M^III)O_2‐x Hydrated Oxides as Electrolyte Ceramics

Synthesis and Direct Sintering of Nanosized (M^IV,M^III)O_2‐x Hydrated Oxides as Electrolyte Ceramics