Field assisted sintering of SiC using extreme heating rates

Gephart, Sean; Singh, Jogender; Kulkarni, A. K.

doi:10.1007/s10853-011-5283-4

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…Although this thermal effect was considered for densification of the green compact only, its effect on limiting particle coarsening during the densification should not be underestimated. In this respect, high heating rates during SPS led to finer grain size in the fully dense ceramics [48,49].…”

Section: Introductionmentioning

confidence: 97%

Grain growth during spark plasma and flash sintering of ceramic nanoparticles: a review

et al. 2017

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Spark plasma and flash sintering process characteristics together with their corresponding sintering and densification mechanisms and field effects were briefly reviewed. The enhanced and inhibited grain growth obtained using these field-assisted densification techniques were reported for different ceramic nanoparticle systems and related to their respective densification mechanisms. When the densification is aided by plastic deformation, the kinetics of grain growth depends on the particles' rotation/sliding rate and is controlled by lattice and pipe diffusion. When the densification is aided by spark, plasma, and the particles' surface softening, grain growth kinetics is controlled by viscous diffusion and interface reactions. Grain growth in both cases is hierarchical by grain rotation, grain cluster formation and sliding, as long as the plastic deformation proceeds or as long as plasma exists. Densification by diffusion in a solid state via defects leads to normal grain growth, which takes over at the final stage of sintering. Various field effects, as well as the effect of external pressure on the grain growth behaviour were also addressed.

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Section: Introductionmentioning

confidence: 97%

Grain growth during spark plasma and flash sintering of ceramic nanoparticles: a review

et al. 2017

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“…Diverse results are also reported for SiC densification in the presence of nonoxide additives . Zhou et al .…”

Section: Introductionmentioning

confidence: 99%

Effects of Current Confinement on the Spark Plasma Sintering of Silicon Carbide Ceramics

et al. 2015

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Despite numerous works have recently reported the densification of silicon carbide (SiC) ceramics using the Spark Plasma Sintering (SPS) technique, the effect of the localized electric current flow near the specimen over the liquid phase sintering process of SiC ceramics and on their microstructural features has not been completely addressed. In the present work, two different SPS setups affecting current flow are selected, one based on the ordinary die/punch setup configuration, and the other employing a BN electrically insulating coating on the inner wall of the die to force the electric current to locally flow through the inner graphite foil in contact with the ceramic compact. The effective electrical resistance and the energy consumed during the SPS runs for both setups, as well as the sintering behavior, microstructure, and mechanical properties of the SPSed materials are analyzed. The BN die coating considerably increases the effective resistance of the system, decreases the power consumption, and accelerates the SiC densification. Besides, ceramic specimens experience significantly higher real temperatures than the set values and, accordingly, coarser microstructures and tougher materials than those for the ordinary setting are produced. The thermoelectrical properties of SiC materials are proposed as fundamental in their SPS process, especially when electrical current is forced through the inner part of the SPS setting around the specimen.

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“…Therefore, by utilizing a higher heating rate where the non densifying mechanisms prevail, densification takes place by volume diffusion and grain boundary, this allow the possibility of having a fine grain retention. However, this could be a challenge for other samples, due to their elevated activation energy for grain growth than that of densification, in this process the heating rate lacks the expected positive effects [12]. Nevertheless, the studies on the effect of heating rate on grain growth and densification of materials prepared by the SPS technique have given rise to several conflicting outcomes [13].…”

Section: Introductionmentioning

confidence: 99%

Spark plasma sintering of CNT-NiAl nanocomposites – Process parameter, densification mechanism, and grain analysis

et al. 2021

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The densification process and grain analysis of consolidated NiAl-CNT composites at 1000 °C, and at varied heating rates from 50 °C/min to 150 °C/min was investigated. The results revealed the effect of heating rate on the densification behaviour of the samples. The displacement of the composites decreased from 3.39 mm to 2.63 mm with increasing heating rate, while the porosity increased by 69% at rapid heating rate. The grain analysis of the sintered samples through the electron backscattered (EBSD) technique indicates the evolution of bigger grains as the heating rate proceeds higher. Furthermore, the mean grain size of the consolidated composites increased from 3.93 μm, to 8.05 μm due to the concentration of defects. Interestingly, there was no texture or predominance of any color evolution in the sintered materials.

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Field assisted sintering of SiC using extreme heating rates

Cited by 12 publications

References 25 publications

Grain growth during spark plasma and flash sintering of ceramic nanoparticles: a review

Grain growth during spark plasma and flash sintering of ceramic nanoparticles: a review

Effects of Current Confinement on the Spark Plasma Sintering of Silicon Carbide Ceramics

Spark plasma sintering of CNT-NiAl nanocomposites – Process parameter, densification mechanism, and grain analysis

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