Methods to calculate sintering stress of porous materials in equilibrium

Wakai, Fumihiro; Shinoda, Yutaka; Akatsu, Takashi

doi:10.1016/j.actamat.2004.08.021

Cited by 71 publications

(47 citation statements)

References 39 publications

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“…[56][57][58] The pore sizes were taken to be 3.5 nm in the oriented nanoparticle system and 25 nm in the nonoriented nanoparticle system. [56][57][58] The pore sizes were taken to be 3.5 nm in the oriented nanoparticle system and 25 nm in the nonoriented nanoparticle system.…”

Section: Sintering Characteristics Of Oriented Zno Nanoparticlesmentioning

confidence: 99%

Heat treatment of ZnO nanoparticles: new methods to achieve high-purity nanoparticles for high-voltage applications

et al. 2015

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Novel methods based on orienting and coating of ZnO nanoparticles were studied in order to obtain uniform, nano-sized and ultra-pure ZnO grains/particles after heat treatment. A 1 nm zinc-hydroxy-salt complex layer on the nanoparticle surfaces was revealed by thermogravimetry and infrared spectroscopy. This 'phase' gradually decomposed into ZnO during the heat treatment while sintering occurred above 600 C, as revealed by scanning-and transmission-electron microscopy. The c-axis alignment of the nanoparticles provided smaller pores than those associated with non-oriented nanoparticles, presenting the means to obtain high-density ceramics. The orientation resulted in a smaller grain size after heat treatment than that of the nonaligned nanoparticles. Another method that involved three stepssilane coating, heat treatment and silica layer etchingwas used to remove the ionic species from the nanoparticle surface while preserving its hydroxylated surface. These ultra-pure nanoparticles are expected to be key components in the development of HVDC insulation polyethylene nanocomposites.

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Section: Sintering Characteristics Of Oriented Zno Nanoparticlesmentioning

confidence: 99%

Heat treatment of ZnO nanoparticles: new methods to achieve high-purity nanoparticles for high-voltage applications

et al. 2015

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“…Most sintering theory model is based on the simple assumption of particle shape and the mass-transport mechanisms. With the rapid development of the computer simulation technology and the computational material science, modeling and numerical simulation of ceramic sintering process become a novel way to investigate the sintering processes on the micro-scale or macro-scale (Jagota and Dawson, 1990;German and Olevsky, 1998;Bordère, 2002;Wakai et al, 2004Wakai et al, , 2005Mori, 2006). At the same time, it is very significant to simulate microstructure evolution of sintering processes on the meso-scale for the theory development and the evaluation of relationship between the mechanical properties and the microstructure of ceramic materials (Guo, 1998b).…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulation of grain-microstructure evolution in two-phase ceramic tool materials

Fang¹,

Huang²,

Liu³

et al. 2009

Journal of Materials Processing Technology

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“…A variety of materials were investigated and the expected trend of a sintering stress decreasing with decreasing porosity was confirmed. 35 Nevertheless, the interest in the topic is far from decreasing, as several more specific studies on the important role played by sintering stress in a variety of advanced material processing technologies and applications have been indicating. [30][31][32][33][34] Little work has been done in order to refine the proposed models, with the only remarkable exception being the comprehensive work of Wakai, in which three different but equivalent methods of sintering stress individuation have been formulated.…”

Section: Introductionmentioning

confidence: 99%

Sintering Stress of Nonlinear Viscous Materials

Giuntini

Olevsky

2016

J. Am. Ceram. Soc.

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An analytical model for the sintering stress of materials characterized by a nonlinear viscous behavior during densification is proposed. The growing applications in the field of nanosized powders processing (in particular, consolidation of high surface area components used in supercapacitors, rechargeable batteries, gas absorbers) have renewed the interest in this fundamental parameter of sintering science, because of the sintering stress’ characteristic inverse proportionality with respect to the powder particles radius. This increase in the magnitude of the sintering stress is also responsible for power‐law creep being the mechanism that underlies densification even without the application of any additional external load, and therefore for a nonlinear viscous behavior of the solid material. The analytical treatment of problems involving nonlinear viscous materials has traditionally involved complex self‐consistent methods and approximations, unless the local case of an isolated pore embedded in a fully dense skeleton was considered. The paper proposes a simple first‐order iterative method that allows the derivation of both bulk modulus and sintering stress of a material containing an arbitrary amount of pores, as functions of porosity and of the material's nonlinearity parameter, namely strain rate sensitivity. An expression for densification kinetics is also obtained and compared with experimental data.

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Methods to calculate sintering stress of porous materials in equilibrium

Cited by 71 publications

References 39 publications

Heat treatment of ZnO nanoparticles: new methods to achieve high-purity nanoparticles for high-voltage applications

Heat treatment of ZnO nanoparticles: new methods to achieve high-purity nanoparticles for high-voltage applications

Monte Carlo simulation of grain-microstructure evolution in two-phase ceramic tool materials

Sintering Stress of Nonlinear Viscous Materials

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