Frenkel's theory of sintering

Ristić, M.M.; Milošević, Siniša

doi:10.2298/sos0601007r

Cited by 67 publications

(36 citation statements)

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“…Sintering is a process by which the surface of a material is reduced by mass transport [12,[22][23][24]. In a previous work [22], we showed that two types of mechanisms are responsible for sintering.…”

Section: Sintering Of Aerogelsmentioning

confidence: 99%

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Sintering of aerogels for glass synthesis

Woignier

Prassas

Duffours³

2018

J Sol-Gel Sci Technol

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Silica glasses can be synthesized by sintering silica aerogels at temperatures ranging from 900 to 1200°C, i.e., close to half the temperatures used for glass melting. The heat treatment can be tailored to obtain either fully densified or porous glass. This paper describes the different steps of the transformation of aerogels into glass along with the textural and microstructural transformations. Different types of information are analyzed: variations in dimensional shrinkage and the apparent density as a function of the densification conditions (temperature, duration of the thermal treatment), the associated structural changes, and the changes in the porous characteristics (macro and meso porosity, average pore radius). The kinetics of dimensional shrinkage help characterize the sintering mechanism. Structural data and porous characteristics allowed us to quantify the transformation of internal aggregates and porosity. Graphical AbstractThe viscous flow-sintering model also applies to fractal aerogels. Highlights •The viscous flow sintering model proposed by Scherer is in good agreement with the sintering kinetics of fractal aerogels. •The viscosities of aerogels and the activation energies of the sintering process depends on the OH content. •The size of the aggregates decreases and the particles increase in size, fractal dimension tends to 3. •The smaller pores sinter first, this local densification causes narrowing of the macropores.

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Section: Sintering Of Aerogelsmentioning

confidence: 99%

“…In the intermediate temperature range, both processes exist and overlap. The viscous flow mechanism and the determination of its activation energy were identified based on the Frenkel model [24]. However, because of the approximations concerning its geometry, the Frenkel model should not be used after first stages of sintering.…”

Section: Sintering Of Aerogelsmentioning

confidence: 99%

Sintering of aerogels for glass synthesis

Woignier

Prassas

Duffours³

2018

J Sol-Gel Sci Technol

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“…The theoretical models that describe the initial stage of sintering are based on the coalescence of two tangent spheres. [27][28][29][30][31][32][33] With these models, the problem of complex geometry of powders is reduced to a much simpler one. Two types of sintering mechanisms can be involved in the neck growth as described by the two-spheres sintering model ( Fig.…”

Section: Theorymentioning

confidence: 99%

Kinetics of the Initial Stage of Sintering from Shrinkage Data: Simultaneous Determination of Activation Energy and Kinetic Model from a Single Nonisothermal Experiment

Pérez‐Maqueda

Criado

Real

2002

Journal of the American Ceramic Society

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A new method for the kinetic analysis of the initial stage of sintering for constant-heating-rate data has been proposed. Unlike all of the methods previously reported in the literature, this new method proposed here allows the simultaneous determination of the activation energy and the kinetic model from a single dilatometric curve recorded under a linear-heating-rate program. The proposed method has been tested with simulated sintering curves and experimental results have been obtained for the sintering of a rutile sample.

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“…Typically, flashes of light of a broad emission spectrum and with a peak in the ultraviolet wavelength range are used. The radiation is absorbed by metal particles which results in a sintering process [21][22][23][24] mainly controlled by the intensity of the radiation and its duration [11]. Additionally, metal particle size and shape plays a role for sintering behaviour.…”

Section: Photonic Sinteringmentioning

confidence: 99%