Fabrication of Dense Nanostructured Silicon Carbide Ceramics through Two‐Step Sintering

Lee, Young-Il; Kim, Young‐Wook; Mitomo, Mamoru; Kim, Do-Hyeon

doi:10.1111/j.1151-2916.2003.tb03560.x

Cited by 145 publications

(69 citation statements)

References 8 publications

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“…So far TSS is applied for 3 mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) [ [25] (K x Na 1−x ) NbO 3 (KNN) ceramic [12,[55][56][57], SiC [58][59][60] and Si3N4 [2] and used for several applications. This section outlined the changes in properties of various ceramics sintered using different TSS profiles.…”

Section: Effect Of Tss With High First-step Temperature On Propertiesmentioning

confidence: 99%

“…Therefore, it is practically impossible to obtain nanostructured ceramics by conventional single-step liquid-phase sintering. TSS was successfully applied in liquid-phase-sintered SiC ceramics, and a fully dense nanostructured SiC ceramic with a grain size of ~40 nm has been obtained [58,59] in argon atmosphere. Magnani et al [60,70] also successfully sintered doped SiC via TSS with enhanced mechanical properties.…”

Section: Sintering Of Si-based Ceramicsmentioning

confidence: 99%

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Two-Step Sintering of Ceramics

Sutharsini¹,

Murugathas²,

RameshSingh³

2018

Sintering of Functional Materials

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Sintering is a critical phase in the production of ceramic bodies. By controlling the density and microstructure formation, sintering now emerged as a processing technology of ceramic materials. Tailoring the structural, mechanical, electrical, magnetic and optical properties is widening the application of ceramics in various fields. Recently, many advanced sintering methods have reported to fabricate ceramic materials with controlled properties. Two-stage sintering (TSS) is one of the simple and cost-effective methods to obtain near-theoretical density materials with controlled grain growth without adding any dopants. Many recent works have reported the use of TSS as a processing method to fabricate nanoceramics for various applications. With this background, this chapter reviews the advantages of TSS in ceramic preparation based on properties and materials and explores the future directions.

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Section: Effect Of Tss With High First-step Temperature On Propertiesmentioning

confidence: 99%

Section: Sintering Of Si-based Ceramicsmentioning

confidence: 99%

Two-Step Sintering of Ceramics

Sutharsini¹,

Murugathas²,

RameshSingh³

2018

Sintering of Functional Materials

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“…For example, the hot isostatic pressing, 4 spark plasma sintering SPS , 8 two-step sintering, 9 and hot-forging 10 techniques have been utilized for fabricating nanocrystalline SiC ceramics.…”

Section: -7mentioning

confidence: 99%

Sinterability of Nano-Sized Silicon Carbide Powders

Kim

Lee

Mitomo

2006

J. Ceram. Soc. Japan

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The sinterability of three kinds of commercially available nano-sized SiC powders and a treated nano-sized SiC powder was investigated using Al 2 O 3 -Y 2 O 3 -CaO as a sintering additive. The commercially available, as-received nano-sized SiC powders were difficult to sinter to a relative density of 95! by conventional hot pressing. The effects of the free carbon and SiO 2 impurities in the starting powders on the sinterability of the nano-sized SiC powders were identical to those on the submicron SiC powders. However, both the extremely high free carbon content and low green density of the commercially available nano-sized SiC powders were responsible for their poor sinterability. The reduction of the free carbon content by oxidation and the control of the SiO 2 content by acid treatment were beneficial for enhancing the sinterability of the nano-sized SiC powder during liquid-phase sintering.

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“…15,16 Analysis of sintering data requires a sound physical model. Although theoretical models usually use idealized geometric assumptions which may not hold in real materials, 8,10,11,[17][18][19][20][21][22][23][24][25][26] a general dimensional argument originated by Herring 27,28 states that the normalized rate of densification, via grain boundary diffusion, can be expressed as…”

mentioning

confidence: 99%

Two‐Step Sintering of Ceramics with Constant Grain‐Size, I. Y₂O₃

Wang

Chen

2005

Journal of the American Ceramic Society

343

207

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Isothermal and constant-grain-size sintering have been carried out to full density in Y 2 O 3 with and without dopants, at as low as 40% of the homologous temperature. The normalized densification rate follows Herring's scaling law with a universal geometric factor that depends only on density. The frozen grain structure, however, prevents pore relocation commonly assumed in the conventional sintering models, which fail to describe our data. Suppression of grain growth but not densification is consistent with a grain boundary network pinned by triple-point junctions, which have a higher activation energy for migration than grain boundaries. Long transients in sintering and grain growth have provided further evidence of relaxation and threshold processes at the grain boundary/triple point. Isothermal and constant-grain-size sintering have been carried out to full density in Y 2 O 3 with and without dopants, at as low as 40% of the homologous temperature. The normalized densification rate follows Herring's scaling law with a universal geometric factor that depends only on density. The frozen grain structure, however, prevents pore relocation commonly assumed in the conventional sintering models, which fail to describe our data. Suppression of grain growth but not densification is consistent with a grain boundary network pinned by triple-point junctions, which have a higher activation energy for migration than grain boundaries. Long transients in sintering and grain growth have provided further evidence of relaxation and threshold processes at the grain boundary/triple point.

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Fabrication of Dense Nanostructured Silicon Carbide Ceramics through Two‐Step Sintering

Abstract: SiC powder compacts were prepared with Al2O3, Y2O3, and CaO powders. By two‐step sintering, fully dense nanostructured SiC ceramics with a grain sizes of ∼40 nm were obtained. The grain size–density trajectories are compared with those of conventional sintering processes.

Cited by 145 publications

References 8 publications

Two-Step Sintering of Ceramics

Two-Step Sintering of Ceramics

Sinterability of Nano-Sized Silicon Carbide Powders

Two‐Step Sintering of Ceramics with Constant Grain‐Size, I. Y₂O₃

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Fabrication of Dense Nanostructured Silicon Carbide Ceramics through Two‐Step Sintering

Abstract: SiC powder compacts were prepared with Al2O3, Y2O3, and CaO powders. By two‐step sintering, fully dense nanostructured SiC ceramics with a grain sizes of ∼40 nm were obtained. The grain size–density trajectories are compared with those of conventional sintering processes.

Cited by 145 publications

References 8 publications

Two-Step Sintering of Ceramics

Two-Step Sintering of Ceramics

Sinterability of Nano-Sized Silicon Carbide Powders

Two‐Step Sintering of Ceramics with Constant Grain‐Size, I. Y2O3

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Product

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Two‐Step Sintering of Ceramics with Constant Grain‐Size, I. Y₂O₃