Sintering behaviors of micron-sized ceramic rod features

Ju, Hong-Fei; Ning, Kaijie; Lu, Kathy

doi:10.1016/j.actamat.2017.11.015

Cited by 9 publications

(16 citation statements)

References 36 publications

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“…For the micrometer ceramic features in this work, the traditional model cannot be directly used because of the increased surface. It is also easy to understand that the N g / N b ratio will decrease ( N g / N b < 36), which has been demonstrated in our previoius work based on a 2D Voronoi diagram simulation . In Figure , the relationship between grain size and relative density are plotted for the bulk and features of ZnO and ZrO 2 based on Equations (2), (5) and .…”

Section: Discussionsupporting

confidence: 54%

“…For the bulk ZnO and ZrO 2 samples, the sintering mechanisms, including both densification and grain growth, can be investigated from a newly developed relationship between grain size and relative density . Previous studies have revealed that ZnO and ZrO 2 bulk densify based on grain‐boundary diffusion. There are four different grain growth mechanisms when the densification is grain‐boundary dominant, including grain boundary migration, surface diffusion, volume diffusion, evaporation‐condensation, and gas diffusion .…”

Section: Discussionmentioning

confidence: 99%

“…The activation energy for ZrO 2 is about twice that for ZnO (500 kJ mol −1 for ZrO 2 and ~220 kJ mol −1 for ZnO). Even though both ZnO and ZrO 2 sintering has been stated as grain‐boundary diffusion enhanced densification, a coherent analysis of densification and grain growth in combination (considering the coupling effect from both) has not been available. This is especially needed for micrometer‐sized features.…”

Section: Introductionmentioning

confidence: 99%

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Effects of ceramic types on evolution of micrometer‐sized features during sintering

Ning

2018

J Am Ceram Soc

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In this work, ZnO and ZrO 2 ridges with 2 lm size are created based on a centrifugeaided micromolding approach and then sintered with different time. Characterization of feature morphology, fidelity, grain size, relative density, and linear shrinkage has been conducted. The densification mechanisms for both ZnO and ZrO 2 are controlled by grain-boundary diffusion, but their grain growth mechanisms are dominated by gas diffusion and surface diffusion respectively. The sintering behavior for the bulk can be described with a N g /N b factor at 36, while for the features, a smaller N g /N b factor (15 for ZnO and 8 for ZrO 2 ) is needed. Attributed to their sintering mechanism difference, the grains in the ZnO features have a faster growth rate than those in the bulk, while the grains in the ZrO 2 features have a similar growth rate to those in the bulk. ZnO has a much faster grain growth behavior, leading to ridge fidelity loss and severe ridge destruction, while ZrO 2 has a much slower grain growth rate, resulting in high ridge fidelity and strong resistance to ridge destruction. K E Y W O R D Sdestruction, micrometer-sized, ridge feature, sintering mechanism, ZnO, ZrO 2

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of ceramic types on evolution of micrometer‐sized features during sintering

Ning

2018

J Am Ceram Soc

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“…The sintering of nanowire-reinforced ceramics was studied for single-phase oxide ceramic models. Hong-Fei Ju et al [46] sintered ZnO rods and reported the sintering activation effect of structures with a high aspect ratio, which was previously discovered in silico for oxide nanowires [22]. The rods and the bulk of the ZnO ceramics demonstrated different behaviors in shrinkage, grain growth, and densification [46].…”

mentioning

confidence: 96%

“…Sintering techniques involving a transient liquid phase are widely used in ceramic manufacturing [45]; therefore, the investigation of the influence of SiC nanowires on the melt formation and overall sintering mechanisms in heterogeneous non-oxide compositions is both scientifically novel and practically applicable. The understanding and control of sintering behavior are pivotal for the engineering of ceramics with desirable properties [23,[31][32][33]46].…”

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confidence: 99%

Effect of In Situ Grown SiC Nanowires on the Pressureless Sintering of Heterophase Ceramics TaSi2-TaC-SiC

et al. 2020

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To ascertain the influence of SiC nanowires on sintering kinetics of heterophase ceramics, two composite powders (TaSi2-TaC-SiC and TaSi2-TaC-SiC-SiCnanowire) are fabricated by mechanically activated combustion synthesis of Ta-Si-C and Ta-Si-C-(C2F4) reactive mixtures. Remarkable compressibility is achieved for the TaSi2-TaC-SiC-SiCnanowire composition (green density up to 84% as compared with 45.2% achieved for TaSi2-SiC-TaC) which is attributed to the lubricating effect of residual adsorbed fluorinated carbon (most likely C4F8). The outcomes of pressureless sintering of TaSi2-TaC-SiC and TaSi2-TaC-SiC-SiCnanowire compositions are vastly different; the former experiences no significant densification or grain growth and does not attain structural integrity, whereas the latter achieves relative density up to 93% and hardness up to 11 GPa. The SiC nanowires are not retained in consolidated ceramics, but instead, act as a sintering aid and promote densification and grain growth. Sintering mechanisms of TaSi2-TaC-SiC and TaSi2-TaC-SiC-SiCnanowire powders are analyzed using thermodynamic and ab initio grand potential calculations, as well as the analysis of grain size versus relative density relations. In the case of solid-state sintering, the densification and grain growth in heterophase non-oxide ceramics are governed by the same mechanisms as previously investigated single-phase oxides. The presence of SiC nanowires enhances grain-boundary related diffusion processes due to the high specific surface and aspect ratio of the nanowires. At 1500 °C, where the formation of the transient Si-based liquid phase is thermodynamically viable, only the SiC nanowire-containing composition demonstrated the intense grain coarsening and densification associated with liquid-assisted sintering. This effect can be attributed both to the presence of SiC nanowires and purification of residual oxide impurities due to C2F4-activated combustion synthesis employed for the in situ formation of SiC nanowires.

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Nanoscale Sintering

Ning

2021

Metal Oxide Nanoparticles

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Sintering behaviors of micron-sized ceramic rod features

Cited by 9 publications

References 36 publications

Effects of ceramic types on evolution of micrometer‐sized features during sintering

Effects of ceramic types on evolution of micrometer‐sized features during sintering

Effect of In Situ Grown SiC Nanowires on the Pressureless Sintering of Heterophase Ceramics TaSi2-TaC-SiC

Nanoscale Sintering

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