Computation of sintering stress and bulk viscosity from microtomographic images in viscous sintering of glass particles

Okuma, Gaku; Kadowaki, Daiki; Hondo, Tsuyoshi; Sato, Akihiro; Tanaka, Satoshi; Wakai, Fumihiro

doi:10.1111/jace.14609

Cited by 20 publications

(18 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The macroscopic quantities such as sintering stress 21 – 23 and bulk viscosity 20 , 24 can be determined rigorously for some idealized microstructures in equilibrium. However, for real porous structures which are nonequilibrium, non-periodic, and nonuniform, it is still a challenge to estimate macroscopic quantities from microstructures observed by X-ray microtomography 25 – 27 . It is recognized that the most appropriate method for determining sintering stress should be selected depending on sintering stage 27 .…”

Section: Introductionmentioning

confidence: 99%

Interface topology for distinguishing stages of sintering

Okuma

Kadowaki

Hondo

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

Sintering is a common process during which nanoparticles and microparticles are bonded, leading to the shrinkage of interstitial pore space. Understanding morphological evolution during sintering is a challenge, because pore structures are elusive and very complex. A topological model of sintering is presented here, providing insight for understanding 3-D microstructures observed by X-ray microtomography. We find that the topological evolution is described by Euler characteristics as a function of relative density. The result is general, and applicable not only to viscous sintering of glasses but also to sintering of crystalline particles. It provides criteria to distinguish the stages of sintering, and the foundations to identify the range of applicability of the methods for determining the thermodynamic driving force of sintering.

show abstract

Section: Introductionmentioning

confidence: 99%

Interface topology for distinguishing stages of sintering

Okuma

Kadowaki

Hondo

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…By employing a simple first‐order iterative procedure, the derived formula can be a valuable extension of the continuum theory of sintering. Wakai et al have analyzed the sintering force of two sphere particles by employing the incompressible Stokes equation. They found that the sintering force can be evaluated from the neck growth rate.…”

Section: Introductionmentioning

confidence: 99%

A thermodynamically consistent phase‐field model for viscous sintering

Yang

Kirshtein

et al. 2018

J Am Ceram Soc

View full text Add to dashboard Cite

A thermodynamically consistent phase-field model for viscous sintering is proposed. It is based on an energetic variational formulation that allows the governing equations to be analytically derived from a defined energy law. The conservation of mass is satisfied through the incompressibility assumption and the assumption that mass density is uniform initially within the particle compact while the balance of linear momentum is formulated from an energy dissipation law. The morphological changes of particles are described by the temporal and spatial evolution of a phase-field variable governed by a modified Cahn-Hilliard equation, and the motion of viscous mass flow is controlled by the Stokes equation incorporating the surface tension effect. The application of the phase-field model is illustrated by examining the effect of particle shape, initial contact angle and rearrangement effects on viscous sintering.

show abstract

“…Model of the initial stage of sintering. (a) Interaction of two particles12) , (b) A particle surrounded by eight neighbors13) .…”

mentioning

confidence: 99%

“…(a) Intermediate stage, (b) Final stage11) . Properties obtained by X-ray microtomography13) . (a) Relative density, (b) Specific surface area, (c) Average of curvature.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Macroscopic Mechanical Properties from 3-D Visualization of Microstructure in Sintering

Okuma

Kanchika

Tanaka

et al. 2017

J. Jpn. Soc. Powder Powder Metallurgy

Self Cite

View full text Add to dashboard Cite

From the macroscopic point of view, shrinkage during sintering can be treated as a linear creep of a porous body under the thermodynamic driving force, i.e., the sintering stress. The final shape of the product and the internal stress which arise during sintering will be predicted by the simulation, if the sintering stress and the bulk viscosity are given as functions of relative density. These macroscopic properties in heterogeneous materials are defined as the average over the representative volume element (RVE). Using X-ray microtomography, it is possible to follow the 3-D microstructure evolution during sintering. Here, we developed methods to estimate macroscopic properties from 3D visualization of microstructures in the scale of RVE observed by X-ray microtomography.

show abstract

Computation of sintering stress and bulk viscosity from microtomographic images in viscous sintering of glass particles

Cited by 20 publications

References 35 publications

Interface topology for distinguishing stages of sintering

Interface topology for distinguishing stages of sintering

A thermodynamically consistent phase‐field model for viscous sintering

Evaluation of Macroscopic Mechanical Properties from 3-D Visualization of Microstructure in Sintering

Contact Info

Product

Resources

About