Growth of beta-silicon carbide whiskers by the VLS process

Milewski, J.; Gac, Frank D.; Petrovic, J. J.; Skaggs, S. R.

doi:10.1007/bf01026309

Cited by 288 publications

(95 citation statements)

References 5 publications

(1 reference statement)

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“…BCNF1-7-7/2800 and BCNF2-6-7/2800, have been prepared from different BCNFs containing equal Si/Ni ratio ( Table 4). Provided that the influence of the characteristics of as-produced BCNFs on their graphitization was not remarkable (Tables 1-3), this difference can only be attributed to the amount of Si in the BCNFs available to form silicide phases that were found to finally promote the production of graphite [34,35]. In this context, the nanographitic materials with the highest graphitic degree have been obtained from the Unlike the XRD parameters, practically no variations of the materials I D /I t Raman ratio were observed by progressively increasing the metal content in the BCNFs (Table 4).…”

Section: Influence Of Bcnfs Compositionmentioning

confidence: 99%

Graphitic nanomaterials from biogas-derived carbon nanofibers

Cuesta

Cameán

Ramos

et al. 2016

Fuel Processing Technology

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Carbon nanofibers with different microstructure and elemental composition that were produced in the catalytic decomposition of synthetic biogas mixtures, in a rotary-bed reactor using nickel and nickel-cobalt catalysts at 600 ºC and 700 ºC, were heat treated in the temperature interval 2600-2800 ºC to explore their ability to graphitize. The influence of treatment temperature as well as carbon nanofibers composition, particularly metallic species, on the structural and textural properties of the materials prepared is discussed. Graphitic nanomaterials with great development of the three-dimensional structure (d 002 ~ 0.3360 nm, L c ~ 48 nm, L a ~ > 100 nm) and low porosity (S BET ~ 20 m 2 g -1 ) have been achieved. Because of the catalytic effect of silicon in the presence of inherent nickel and cobalt metals, more structurally ordered materials were obtained from the carbon nanofibers by adding silica. Based on the results of this work, the utilization of biogasderived carbon nanofibers for the production of synthetic nanographite to be used in different applications, such as electrode material in energy storage devices in which both high degree of graphitic order and small surface area are required, appears feasible.

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Section: Influence Of Bcnfs Compositionmentioning

confidence: 99%

Graphitic nanomaterials from biogas-derived carbon nanofibers

Cuesta

Cameán

Ramos

et al. 2016

Fuel Processing Technology

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“…However, the VLS mechanism proposed by Milewski et al 13) to explain the SiC whisker growth might provide us a valuable hint for this concern. In the VLS process, V is claimed to stand for ''vapour feed gas'', L for ''liquid catalyst'' and S for ''solid crystalline whisker growth''.…”

Section: 1mentioning

confidence: 99%

“…Thus, it is not quite surprising that the detected WC whiskers grew preferentially over the grain boundary by the VLS mechanism, 13) although conclusive mechanism must be decided by further systematic investigation.…”

Section: Wc Whisker Growth Site Preferencementioning

confidence: 99%

“…In the VLS process, V is claimed to stand for ''vapour feed gas'', L for ''liquid catalyst'' and S for ''solid crystalline whisker growth''. Milewski et al 13) claimed that the presence of a liquid catalyst is the key factor for the VLS process to allow the concerned crystalline whisker growth at the liquid-vapour interface. Trace impurity of low melting temperature metals like Al and Fe appear to function as the liquid catalyst in the VLS process by allowing supersaturation of carbon in it.…”

Section: 1mentioning

confidence: 99%

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Nano-Meter Size WC Whiskers Grown over a Compacted Pellet of Graphite/Tungsten Powder Mixture Heated with an Ultra-Fast Heating Rate by a Concentrated Solar Beam

et al. 2007

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In equilibrium binary W-C system, mono-carbide WC is acknowledged as the stable phase under presence of excess free carbon up to temperature 2700 C whereas sub-carbide W 2 C would form between 1250 C and 2700 C under the carbon-deficiency condition. In unique setup of solar furnace at PROMES-CNRS in Odeillo (France), temperature of specimen is raised from the ambient temperature to target temperature up to 2000 C within fractions of a second. In the recent experimental attempts of W 2 C phase synthesis using this unique experimental facility starting from compacted pellet consisted of graphite and tungsten powders at ratios smaller than 0.50, we detected growth of nano-meter size WC whisker at the top surface directly exposed to the concentrated solar beam. The presence of WC was confirmed also by X-ray diffraction (XRD) of the top surface but, when the specimen as a whole was subjected to powder XRD analysis, WC became indiscernible being masked by principal W 2 C phase. Mechanism of formation of the detected WC nano-whisker over sub-stoichiometric C/W pellet during ultra-fast heating by concentrated solar beam is discussed.

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“…This reaction should readily occur in the silica black samples, which contain intimately mixed silica and carbon. SiO formation may be followed by whisker growth, according to Reaction (3),1), 3) SiO(g)+2C(s)=SiCw+CO(g) (3) In Reactions (2) and (3), C(s) comes from the black ore (Exps. 1-3), the graphite powders (Exps.…”

mentioning

confidence: 99%