Effect of carbon content on the microstructure and properties of silicon carbide-based sinters

Rączka, Marian; Górny, G; Stobierski, L.; Rożniatowski, K.

doi:10.1016/s1044-5803(01)00132-2

Cited by 20 publications

(13 citation statements)

References 2 publications

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“…Nevertheless, the drawback of free C is its potential negative influence on mechanical properties such as hardness and toughness [21]. By playing a key role on diffusion processes during sintering, free C located at grain boundaries is also expected to influence the final grain size and density of the pellets [22].…”

Section: Introductionmentioning

confidence: 99%

Effects of carbon and oxygen on the spark plasma sintering additive-free densification and on the mechanical properties of nanostructured SiC ceramics

Lanfant

Leconte

Bonnefont

et al. 2015

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Effects of carbon and oxygen on the spark plasma sintering additive-free densification and on the mechanical properties of nanostructured SiC ceramics

Lanfant

Leconte

Bonnefont

et al. 2015

Journal of the European Ceramic Society

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“…3 The addition of C aids the removal of the B 2 O 3 (c). [1][2][3] This is analogous to what occurs in the SiC system, [4][5][6][7] in which it is thought that one of the factors leading to high-density SiC is the complete removal of the SiO 2 oxide layer at temperatures lower than typical sintering temperatures.…”

Section: Introductionmentioning

confidence: 84%

Modeling of Gas‐Phase Transport and Composition Evolution during the Initial‐Stage Sintering of Boron Carbide with Carbon Additions

Rossi

Matthewson

Kaza

et al. 2010

Journal of the American Ceramic Society

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Densification of B4C during sintering can be aided by removing the native B2O3(condensed) (B2O3(c)) layer present on the starting B4C powder. B2O3 can be removed by adding excess C and holding the powder compact at an intermediate temperature below the normal sintering temperature. This allows time for CO and minor boron gases to diffuse out from the porous compact before the pores close. This process was examined using a computational model based on codiffusion of multiple gas species, which enables prediction of the gas‐ and condensed‐phase composition as a function of time and position in the specimen. The model, described previously elsewhere, was originally applied to the SiC/SiO2 system but has been adapted for the B4C/B2O3 system. The results are used to determine the optimum holding time for complete B2O3(c) removal as a function of key parameters, such as specimen thickness, particle size, temperature, etc. The role of gas‐phase transport in residual C and B4C profiles is also examined.

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“…Second, the oxide coating of metal powders can be removed by the addition of the carbon powders to starting powders, which results in the reaction of carbon and oxide (carbothermic reaction). This method has been used to remove the surface oxide during the pressure‐assisted or pressure‐less sintering of SiC, B 4 C, and ZrB 2. Since the oxide is removed via the gas phase, the gas diffusion is the rate‐limiting step for the complete removal of the oxide phase .…”

Section: Introductionmentioning

confidence: 99%

Oxidation effects on spark plasma sintering of molybdenum nanopowders

et al. 2018

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Surface-oxidized molybdenum nanopowders are compacted by spark plasma sintering (SPS). The oxide impurity behavior is analyzed under various sintering temperatures. The densification mechanism of the nanopowders with a melted oxide phase is identified in situ by regression analysis of the experimental data on the temperature-dependent porosity change and on the SPS multistep pressure dilatometry. To increase the density of the compacted pellets, the nanopowders with the oxide phase are consolidated by SPS using the two in situ oxide removal methods: carbothermic reduction and particle surface cleaning by the electric current flow through the powders. The advantages and disadvantages of these methods in terms of the density, grain size, and mechanical properties of the final products are discussed. K E Y W O R D Sdensification mechanism,

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Effect of carbon content on the microstructure and properties of silicon carbide-based sinters

Cited by 20 publications

References 2 publications

Effects of carbon and oxygen on the spark plasma sintering additive-free densification and on the mechanical properties of nanostructured SiC ceramics

Effects of carbon and oxygen on the spark plasma sintering additive-free densification and on the mechanical properties of nanostructured SiC ceramics

Modeling of Gas‐Phase Transport and Composition Evolution during the Initial‐Stage Sintering of Boron Carbide with Carbon Additions

Oxidation effects on spark plasma sintering of molybdenum nanopowders

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