A Sol-Gel Route to B4C

Kroke, Edwin; Völger, Karl W.; Klonczynski, Alexander; Riedel, Ralf

doi:10.1002/1521-3773(20010504)40:9<1698::aid-anie16980>3.0.co;2-z

Cited by 33 publications

(14 citation statements)

References 24 publications

(11 reference statements)

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“…These findings indicate that the amorphous Si-C-N ceramics are candidate materials for high temperature applications. Recently, a sol-gel process based on reactions of bis trimethylsilylcarbodiimide with chlorosilanes 17,18 or B-trichloroborazene 19,20 was discovered. This process is one of very few examples for non-oxide sol-gel processes.…”

Section: 12mentioning

confidence: 99%

新規な非酸化物系ゾルゲル法によるメソポーラスアモルファス Si-C-N 膜の合成と評価

Völger

Hauser

Kroke

et al. 2006

J. Ceram. Soc. Japan

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Note péÉÅá~ä fëëìÉ Äó dìÉëí bÇáíçêëW lêÖ~åáÅ-íç-fåçêÖ~åáÅ`çåîÉêëáçå mêçÅÉëë Ñçê mçäóãÉê-aÉêáîÉÇ`Éê~ãáÅë póåíÜÉëáë~åÇ`Ü~ê~ÅíÉêáò~íáçå çÑ kçîÉä kçålñáÇÉ pçä-dÉä aÉêáîÉÇ jÉëçéçêçìë^ãçêéÜçìë pá-`-k jÉãÄê~åÉë A novel sol-gel-derived preceramic polymer, namely polyorganosilylcarbodiimide, was synthesized for fabrication of thermally stable amorphous Si-C-N membranes. The gelation process as well as the viscosity of the polyorganosilylcarbodiimide was adjusted for spin coating by reacting a mixture of alkyl and dialkyl chlorosilane monomers with bistrimethylsilylcarbodiimide. The polymeric precursor film was successfully fabricated on a porous substrate by solvent-free spin coating, subsequently converted into a mesoporous amorphous Si-C-N thin film by pyrolysis at 1000c C in Ar. SEM observation as well as N 2 sorption isotherm analysis exhibited the formation of meso-pore channels within the amorphous thin layer. These results indicate that the novel polyorganosilylcarbodiimide developed in this study is suitable for fabricating meso-porous amorphous membranes in the ternary Si-C-N system and with high thermal and chemical stability.

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Section: 12mentioning

confidence: 99%

新規な非酸化物系ゾルゲル法によるメソポーラスアモルファス Si-C-N 膜の合成と評価

Völger

Hauser

Kroke

et al. 2006

J. Ceram. Soc. Japan

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“…A crystalline composition of B 4 CN 4 is reported to occur on direct nitridation of B 4 C with nitrogen in the 1600 to 2250°C range [20,21]. Amorphous B 4 CN 4 was obtained by the pyrolyzation of a xerogel consist of B-trichloroborazene and bis(trimethylsilyl)carbodiimide [22,23]. Attempts have been made to prepare high surface area BCN by heating mesoporous carbon with B 2 O 3 at high temperatures in a nitrogen environment [24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, and Properties of Mesoporous B/C/N Microspheres

Raidongia

Hembram

Waghmare

et al. 2009

Zeitschrift anorg allge chemie

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Reaction of low surface area carbon with a mixture of urea and boric acid at 930°C yields a composition close to BC 4 N with a graphitic structure. BC 4 N was characterized by electron energy loss spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, Raman spectroscopy, and X-ray diffraction. BC 4 N is a porous ceramic with a surface area of 428 m 2 ·g -1 , and shows a CO 2 uptake of 40 wt-%. The layered structure of BC 4 N involves a random

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“…BCl 3 ) or B-trichloroborazene can be reacted with R 3 SiÀN¼C¼NÀSiR 3 to form non-oxide gels [60]. In a final step, the gels are transformed to glasses and ceramics by a thermal treatment up to 1000-1300 C [59].…”

Section: The Sol-gel Processmentioning

confidence: 99%