Carbothermal Synthesis of Al‐O‐N Coatings Increasing Strength of SiC Fibers

Chen, Linlin; Gogotsi, Yury

doi:10.1111/j.1744-7402.2004.tb00156.x

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Carbon‐coated SiC whiskers can be used for reinforcement of ceramic matrix composites. The carbon coating can also be transformed into BN, 20 AlN, 32 or other coatings to create oxidation‐resistant interfaces for high‐temperature composites. Forests of graphite‐coated SiC whiskers or whiskers completely transformed into graphite may find applications as field emitters similar to carbon nanotubes.…”

Section: Discussionmentioning

confidence: 99%

Formation of Carbide‐Derived Carbon on β‐Silicon Carbide Whiskers

Cambaz

Yushin

Gogotsi

et al. 2005

Journal of the American Ceramic Society

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Carbon was synthesized on b-SiC whiskers by extraction of Si atoms from SiC. In this study, three different elevated temperature extraction methods were used to remove Si atoms from SiC: treatments in either Cl 2 or HCl and vacuum decomposition. In all chlorination experiments and vacuum treatment at 17001C, carbon preserved the original shape of SiC whiskers. At higher temperatures (20001C), vacuum decomposition led to a distortion in the shape of the whiskers. High-resolution transmission electron microscopy and Raman spectroscopy showed that the structure of carbide-derived carbon depends on the Si extraction method and the process parameters. Chlorination of SiC resulted in the formation of mostly amorphous nanoporous carbon. High-temperature treatment of SiC in HCl environment produced fullerene-like structures, while high-temperature vacuum decomposition resulted in the formation of graphite. Transmission electron microscopy studies of the carbon coating thickness produced in Cl 2 at various chlorination times revealed linear reaction kinetics at 7001C. Raman studies showed that the carbon structure became more ordered with increasing chlorination temperature. The results obtained demonstrate that by using the silicon extraction technique, one can precisely control the thickness and morphology of the carbon coating. II. Materials and Experimental ProcedureExperiments were performed on cubic silicon carbide (b-SiC) whiskers with an average diameter of 200 nm and an aspect ratio 509 J ournal

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Section: Discussionmentioning

confidence: 99%

Formation of Carbide‐Derived Carbon on β‐Silicon Carbide Whiskers

Cambaz

Yushin

Gogotsi

et al. 2005

Journal of the American Ceramic Society

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Carbide‐Derived Carbons – From Porous Networks to Nanotubes and Graphene

Presser

Heon

Gogotsi

2011

Adv Funct Materials

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610

492

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from carbides has attracted special attention lately. [ 3,4 ] Carbide-derived carbons (CDCs) encompass a large group of carbons ranging from extremely disordered to highly ordered structures ( Figure 1 ). The carbon structure that results from removal of the metal or metalloid atom(s) from the carbide depends on the synthesis method (halogenation, hydrothermal treatment, vacuum decomposition, etc.), applied temperature, pressure, and choice of carbide precursor.The growing interest in this fi eld is refl ected by a rapidly increasing number of publications and patents. A signifi cant progress in CDC research has been seen in several fi elds. Various carbide precursors have been systematically studied. Studies on binary carbides with different grain sizes show the possibility of low-temperature carbon formation for nanopowders. Also, a better understanding of graphene formation during high-temperature vacuum decomposition of silicon carbide has been achieved since SiC single crystals are now available in large sizes with extremely low defect concentrations and an almost atomically fl at surface fi nish. [ 8 ] CDC applications as electrode materials in electric double layer capacitors have attracted much attention lately. [ 9 ] The unique properties of porous CDC obtained by halogenation, such as a high specifi c surface area and tunable pore size with a narrow size distribution, make it an ideal material for sorbents or supercapacitor electrodes. CDCs have been derived from many precursors (SiC, TiC, Mo 2 C, VC, etc.) using a variety of treatment conditions that lead to a broad range of useful properties. Furthermore, graphene, [ 10 ] nanotubes, [ 11 ] and even nanodiamond [ 12 ] can be produced from carbide precursors. Their applications naturally differ from those of porous CDC.The last comprehensive journal review on this subject was published about fi fteen years ago in Russian; [ 13 ] book chapters published later [ 3,4 , 14 ] are less accessible and require updating due to rapid progress in the fi eld over the past few years. The most recent review of CDC [ 14 ] covers only energy-related applications. Therefore, a comprehensive review on the fi eld is long overdue. The goal of this article is to show how a variety of carbon structures can be produced from carbides, to explain how those structures can be controlled on the nanometer and subnanometer scale, and to describe CDC properties that are benefi cial for a number of applications. Carbide-Derived Carbons -From Porous Networks to Nanotubes and GrapheneCarbide-derived carbons (CDCs) are a large family of carbon materials derived from carbide precursors that are transformed into pure carbon via physical (e.g., thermal decomposition) or chemical (e.g., halogenation) processes. Structurally, CDC ranges from amorphous carbon to graphite, carbon nanotubes or graphene. For halogenated carbides, a high level of control over the resulting amorphous porous carbon structure is possible by changing the synthesis conditions and carbide precursor. The large number of...

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Al–O–N and Al–O–B–N thin films applied on Si–O–C fibers

Delcamp

Maillé

Martin

et al. 2010

Composites Science and Technology

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Protective coatings (Al-ON and Al-O-B-N) on Si-O-C fibers (Tyranno ZMI) were applied in order to enhance oxidation resistance under severe thermo-mechanical conditions in the 400-600°C temperature range. The coating process consisted in three steps: (i) the transformation of the Si-O-C fiber surface into microporous carbon; (ii) the impregnation of these carbon microporous layers by an aluminium trichloride (AlCl 3) solution and then, (iii) a final heat-treatment under ammonia. Processing parameters were studied in order to select the best conditions. Using these conditions, obtained results have shown that coatings were present around each fiber, with a controlled thickness, and that the mechanical properties of the fibers were preserved. Although, these coatings did not entirely stop the oxygen ingress, it has been shown that they strongly reduced the oxidation of the fiber.

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Carbothermal Synthesis of Al‐O‐N Coatings Increasing Strength of SiC Fibers

Cited by 6 publications

References 28 publications

Formation of Carbide‐Derived Carbon on β‐Silicon Carbide Whiskers

Formation of Carbide‐Derived Carbon on β‐Silicon Carbide Whiskers

Carbide‐Derived Carbons – From Porous Networks to Nanotubes and Graphene

Al–O–N and Al–O–B–N thin films applied on Si–O–C fibers

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