Low-temperature synthesis of biomorphic cellular SiC ceramics from wood by using a Na flux

Yamane, Hisanori; Kawamura, Fumihiro; Yamada, Takahiro

doi:10.2109/jcersj2.116.163

Cited by 15 publications

(10 citation statements)

References 17 publications

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“…No phase diagram has been reported for the Na-Si binary system. However, as discussed in the previous reports, 17,18) some amount of Si is considered to be dissolved in a Na melt.…”

Section: Low-temperature Synthesis Of Sic Porous Granules With a Na Fluxmentioning

confidence: 98%

“…Recently, we found that -type cubic SiC could be prepared from a Si and fullerene powder mixture or a Si and amorphous carbon (carbon black) powder mixture by the Na flux method at 900-1000 K. 16,17) Furthermore, woods from balsa and Japanese cypress were transformed into carbonaceous preforms by pyrolysis and subsequently converted into cellular SiC ceramics by heating with Na and Si at 973 K. 18) Cellular structures similar to those of the preforms were observed for the resulting porous SiC ceramics. However, these SiC pellets and cellular SiC could not have the adequate strength and stiffness because of their low density.…”

Section: Introductionmentioning

confidence: 99%

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Low-Temperature Synthesis and Mechanical Properties of SiC Porous Granules from Activated Charcoal with a Na Flux

et al. 2008

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SiC porous granules were synthesized from activated granular charcoal and Si powder at 973 K by using a Na flux. The SiC granules maintained the shape of the charcoal with a dimension of about 5 mm in diameter and 7-10 mm in length. X-ray diffraction showed the structure of the formed SiC to be cubic -type. Agglomerates of a few dozen nm of SiC grains and an electron diffraction ring pattern of -SiC were observed with a transmission electron microscope. A micropore size distribution of < 4 nm and mesopores in the range of 20-40 nm were shown by a nitrogen adsorption technique. The SiC granules had a specific surface area of 3:4 AE 1:0 m 2 /g and a pore volume of 0:006 AE 0:002 cm 3 /g. The fracture stress of the SiC porous granules was evaluated to be 47 MPa by a compressive test at room temperature. The Vickers hardness of the granule surface was 13:1 AE 1:0 GPa.

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“…No phase diagram has been reported for the Na-Si binary system. However, as discussed in the previous reports, 17,18) some amount of Si is considered to be dissolved in a Na melt.…”

Section: Low-temperature Synthesis Of Sic Porous Granules With a Na Fluxmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis and Mechanical Properties of SiC Porous Granules from Activated Charcoal with a Na Flux

et al. 2008

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“…After formation of SiC with Na vapor and Na evaporation from the sample, residual carbon was removed as CO2 by heating the product in air. Figure 12 shows a photograph and a scanning electron micrograph of the β-SiC bulk prepared by heating carbonized balsa wood with Si and Na at 973 K for 24 h. 46) The as-prepared sample was covered with Na which was removed by reaction with alcohol. The structure and texture of the original carbonized wood were well maintained.…”

Section: Jcs-japanmentioning

confidence: 99%

Synthesis of nitrides and silicon carbide using sodium

Yamane

2009

J. Ceram. Soc. Japan

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Studies on the synthesis of nitrides, nitride-related compounds and silicon carbide by using Na as a flux and reaction enhanced medium are reviewed. Using a Na melt, ternary and quaternary nitrides and nitride-related compounds containing Ba and Sr were prepared at around 1000 K and N2 pressure below about 10 MPa. Crystal growth of a binary nitride GaN by heating Ga and N2 with Na was also found during the studies of the multinary compounds. AlN powder was prepared above the Al melting temperature of 932 K. Single crystals of CrN and Mn2N were obtained by heating Cr and Mn with a Na-Ga flux and a Na-In flux, respectively. β-type SiC powder and porous bulks were prepared by reaction of Si and fullerene with Na or Si and amorphous carbon with Na at 1000 K. The role of Na in the formation of the nitrides and silicon carbide is herein discussed.

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“…1) In 2006, synthesis of new ternary carbides was attempted by using a Na flux. During this study, it was revealed that the Na flux was effective for the low-temperature synthesis of SiC 2) 4) ahead of the preparation of a new ternary carbide, Ba 3 Si 4 C 2 .…”

Section: Introductionmentioning

confidence: 99%

Low-temperature synthesis of Si and Si-based compounds using Na

Morito

2014

J. Ceram. Soc. Japan

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Low-temperature solution growth of Si crystals using Na was demonstrated based on the NaSi binary phase diagram. Single crystals, films, porous bulk samples, and helical microtubes of Si crystals were prepared from a NaSi solution by Na evaporation. Dissolution and crystallization of Si in a Na melt reduced the impurity content in the Si crystals. Low-temperature synthesis and morphology control of porous SiC ceramics using Na were also performed and a new ternary compound, Na 8 B 74.5 Si 17.5 , was synthesized.

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Low-temperature synthesis of biomorphic cellular SiC ceramics from wood by using a Na flux

Cited by 15 publications

References 17 publications

Low-Temperature Synthesis and Mechanical Properties of SiC Porous Granules from Activated Charcoal with a Na Flux

Low-Temperature Synthesis and Mechanical Properties of SiC Porous Granules from Activated Charcoal with a Na Flux

Synthesis of nitrides and silicon carbide using sodium

Low-temperature synthesis of Si and Si-based compounds using Na

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