Electric field effect on texture formation of mullite in spark plasma sintered SiC with Al2O3–SiO2 additive

Shinoda, Yutaka; Suzuki, Yoshikazu; Yoshida, Katsumi

doi:10.1016/j.scriptamat.2014.12.011

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…The orientation is likely to be constant once the porcelain was sintered for 15 minutes at 1100°C with no further reorientation in the SPSed 1200°C samples. Similar result reported by Shinoda et al 43 showed that the mullite orientation (c-axis of mullite) in Al 2 O 3 -SiO 2 -SiC composites sintered using SPS is oriented perpendicular to the compressive plane. Thus, it can be concluded that the applied pressure in the SPS significantly influences mullite orientation.…”

Section: Mullite Formation In Porcelains Under the Sps Conditionssupporting

confidence: 87%

Impact of spark plasma sintering (SPS) on mullite formation in porcelains

et al. 2017

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The effect of the spark plasma sintering (SPS) process on mullite formation in porcelains was studied using X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. SPS affected the kinetics and morphology of formed mullite. After sintering at 1100°C, unlike conventional sintering, SPS promoted the formation of mullite due to the combination of vacuum and applied pressure. Mullite crystal growth was altered by the atmosphere (vacuum), dwell time (0‐15 minutes), and temperature (1000‐1200°C). The applied pressure caused the mullite needles to orient perpendicular to the direction of the applied load. Depending on SPS dwell time, the mullite formed after sintering at 1100°C also had different crystal structure (tetragonal for short dwell time of 0‐5 minutes and orthorhombic for a long dwell time of 10‐15 minutes). Dissolution of mullite was observed at 1100°C by extending the dwell time by up to 15 minutes and the dissolved mullite reprecipitated on the small needles (~40 nm) and coarsened via Oswald ripening resulting in larger mullite needles (~60 nm).

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Section: Mullite Formation In Porcelains Under the Sps Conditionssupporting

confidence: 87%

Impact of spark plasma sintering (SPS) on mullite formation in porcelains

et al. 2017

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“…In addition, these results are consistent to comparative sintering studies between FAST/SPS and hot pressing, where no significant impact was found neither on densification nor on grain growth behavior for insulating [71], semiconducting [39] or ion conducting materials [72]. Shinoda et al [73] showed that crystalline texture occurs during liquid phase sintering of SiN 3 only if specimen is not electrically insulated. Here, precipitation of nuclei with preferred orientation occurs due to presence of electric field.…”

Section: Development Of Crystalline Texturesupporting

confidence: 82%

FAST/SPS sintering of nanocrystalline zinc oxide—Part II: Abnormal grain growth, texture and grain anisotropy

Dargatz

González‐Julián

Bram

et al. 2016

Journal of the European Ceramic Society

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“…First, it is worth noting that the monolithic mullite ceramic prepared via TVS has a high Vickers hardness of 12 GPa (1 kgf), which is similar to that of the bulk sample (12.3 GPa, 0.1 kgf) sintered directly from mullite powder by SPS at 1700 °C, reflecting again the unparalleled advantage in sintering temperature by using the TVS method. 53 However, the hardness of the composites decreases mildly to ∼10 GPa and shows no obvious correlation with the rGO content. This phenomenon can be understood from two view points.…”

Section: Emi Shielding Performancementioning

confidence: 95%

Electrically Conductive and Mechanically Strong Graphene/Mullite Ceramic Composites for High-Performance Electromagnetic Interference Shielding

Fan

Zhou

et al. 2018

ACS Appl. Mater. Interfaces

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Ceramic composites with good electrical conductivity and high strength that can provide electromagnetic interference (EMI) shielding are highly desirable for the applications in harsh environment. In this study, lightweight, highly conductive, and strong mullite composites incorporated with reduced graphene oxide (rGO) are successfully fabricated by spark plasma sintering at merely 1200 °C using the core−shell structured γ-Al 2 O 3 @SiO 2 powder as a precursor. The transient viscous sintering induced by the γ-Al 2 O 3 @SiO 2 precursor not only prohibits the reaction between mullite and rGO by greatly reducing the sintering temperature, but also induces a highly anisotropic structure in the rGO/mullite composite, leading to an extremely high in-plane electrical conductivity (696 S m −1 for only 0.89 vol % of rGO) and magnitude lower cross-plane electrical conductivity in the composites. As a result, very large loss tangent and EMI shielding effectiveness (>32 dB) can be achieved in the whole K band with extremely low rGO loading (less than 1 vol %), which is beneficial to maintain a good mechanical performance in ceramic matrix composites. Accordingly, the rGO/mullite composites show greatly improved strength and toughness when the rGO content is not high, which enables them to be applied as highly efficient EMI shielding materials while providing excellent mechanical performance.

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Electric field effect on texture formation of mullite in spark plasma sintered SiC with Al2O3–SiO2 additive

Cited by 7 publications

References 19 publications

Impact of spark plasma sintering (SPS) on mullite formation in porcelains

Impact of spark plasma sintering (SPS) on mullite formation in porcelains

FAST/SPS sintering of nanocrystalline zinc oxide—Part II: Abnormal grain growth, texture and grain anisotropy

Electrically Conductive and Mechanically Strong Graphene/Mullite Ceramic Composites for High-Performance Electromagnetic Interference Shielding

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