Inhibition of grain growth in liquid-phase sintered SiC ceramics by AlN additive and spark plasma sintering

Hotta, Mikinori; Hojo, Junichi

doi:10.1016/j.jeurceramsoc.2010.04.006

Cited by 47 publications

(17 citation statements)

References 32 publications

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“…There are other works on the topic where nonoxide and oxide sintering additives were combined; for example, studies on SPSed SiC at 1900°C with Y 2 O 3 –AlN additives (up to 10 vol%), which produced fully dense materials with a mean grain size of 150 nm and maximum flexural strength of 1100 MPa …”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…In general, the aim of microstructure control is to achieve higher density, finer grains and more uniform structures. In most cases the enhanced mechanical properties of ceramics can be achieved by fine and uniform grains [4,5]; thus, the control of grain growth is an important issue in the fabrication of high performance ceramics. Especially, for nanometer ceramics, the nano-sized particles often undergo rapid grain growth during sintering and lose nano-scale characteristics because the grains grow to greater than 100 nm [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of zirconia ceramics consolidated by a novel oscillatory pressure sintering

Xie

Xue

2015

Ceramics International

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“…The mechanical properties of ceramics are largely dependent on the microstructure. The liquid phase sintered ceramics have high fracture toughness compared with the solid-phase sintered SiC, because the elongated grains can form during liquid phase sintering [7]. 4.…”

Section: To 1950mentioning

confidence: 99%

“…The liquid-phase sintered SiC ceramics have high fracture toughness compared with solid phase sintered SiC, because the elongated grains can form during liquid-phase sintering [7]. However, a major problem associated with sintering of silicon carbide in the presence of oxide additives is the reaction between the silicon carbide and the oxides.…”

Section: Introductionmentioning

confidence: 99%

The Spark Plasma Sintering of Silicon Carbide Ceramics Using Alumina

et al. 2014

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SiC ceramics were fabricated by spark plasma sintering technique with the use of Al2O3 additive. The sintering process was carried out at three dierent temperatures in the range of 17001800• C applying two dierent pressures 40 and 80 MPa under vacuum atmosphere. The eect of additive, dierent temperatures and pressures on densication behaviour, density, Vickers hardness, fracture toughness, and microstructure were examined. The hardness and fracture toughness of the samples were evaluated by the Vickers indentation technique. Microstructure of spark plasma sintered SiC samples were characterized by using scanning electron microscopy technique. The highest value of fracture toughness 5.9 ± 0.2 MPa m 1/2 was achieved with the addition of 5 vol.% Al2O3.

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Inhibition of grain growth in liquid-phase sintered SiC ceramics by AlN additive and spark plasma sintering

Cited by 47 publications

References 32 publications

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

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

Microstructure and mechanical properties of zirconia ceramics consolidated by a novel oscillatory pressure sintering

The Spark Plasma Sintering of Silicon Carbide Ceramics Using Alumina

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