Sublimation of carbon grains in a plasma flow generated by an RF induction plasmatron

Власов, В. И.; Zalogin, G. N.; Kusov, A. L.

doi:10.1134/s1063784207010057

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…A decrease in the pressure or an increase in the plasma velocity due to the use of a nozzle with a smaller outlet cross section prevents CNT formation. This is related to both a decrease in the concentration of carbon atoms because of a shorter time of residence of particles in a plasma flow and a decrease in the time it takes for the intermediate products required for CNT growth to form [3]. Experiments on a mixture of methane and argon showed that CNTs did not form in the absence of a catalyst even under proper conditions.…”

Section: Discussionmentioning

confidence: 89%

“…The advantages of setups with rf heating of a gas as compared to setups of other types were considered in [3].…”

Section: Synthesis Of Carbonmentioning

confidence: 99%

“…The first positive results on CNT synthesis with the use of a high power (1 MW) rf induction plas matron (rf plasmatron) were described in [2]. The authors of [3] solved the problem of evaporation of a carbon powder in the plasma flow of an rf plasmatron by a direct statistical simulation and proposed a calcu lation theoretical corroboration of the application of this method. This method and the related equipment were patented [4].…”

Section: Introductionmentioning

confidence: 97%

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Synthesis of carbon nanostructures in an RF induction plasmatron

et al. 2015

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The method and results of synthesizing carbon nanotubes and onion like structures by the subli mation of a mixture of a carbon powder with a catalyst (Y 2 (CO 3 ) 3 ) in the plasma flow of an inert gas (argon) generated in an rf plasmatron are described. Carbon vapors are condensed into fullerene containing soot onto various materials (Al, Cu, Ti, stainless steel) placed in the working chamber of an experimental setup. The composition of the synthesized soot is analyzed by modern highly informative methods (Raman spec troscopy, transmission electron microscopy, X ray diffraction). Single wall carbon nanotubes of a small diameter (1.2 nm) and onion like structures 10-20 nm in size are formed in experiments. In a reference experiment on a mixture of argon and methane, a material, which consists of a mixture of amorphous carbon, nanosized graphite, and graphite with a crystallite size of several microns, is synthesized. The effect of the substrate material, the gas pressure, and the plasma flow velocity on the formation of carbon nanotubes is studied.

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Section: Discussionmentioning

confidence: 89%

“…The advantages of setups with rf heating of a gas as compared to setups of other types were considered in [3].…”

Section: Synthesis Of Carbonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Synthesis of carbon nanostructures in an RF induction plasmatron

et al. 2015

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“…Необходимость разработки высокоэффективных плазмохимических технологий синтеза углеродных наноструктур [1][2][3], получения особо чистых веществ [4] и наночастиц [5,6], включающих стадию испарения твердых углеродных, металлических и керамических порошков с применением индукционной плазмы, на протяжении многих лет вызывает значительный интерес к расчетнотеоретическому изучению процессов в высокочастотных индукционных (ВЧИ) плазмотронов [7,8].…”

Section: Introductionunclassified

О Выборе Параметров Высокочастотного Индукционного Плазмотрона И Дисперсного Потока Испаряемых Кварцевых Частиц

Miao¹,

Гришин²

2020

Журнал Технической Физики

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Numerical simulation of the heating and evaporation processes of quartz particles in a technical induction plasma torch of argon plasma was performed in the framework of a two-phase collisionless monodisperse model. The particle supply conditions within a full and partial penetration through the frontal ring-type vortex into discharge zone were determined. The dependences of the evaporation degree and specific energy cost for evaporation on the main operation parameters of the particle processes, primarily the coupled power of plasma torch, as well as the particle size, feed rate and entry angle into the discharge zone were established. The recommendations on the choice of the optimal operation parameters of the plasma torch and the flow parameters of quartz particles were given. It was shown that the technical induction plasma torch with a coupled power of about 5 kW can provide a complete evaporation of the quartz particles with sizes up to 50 – 70 μm and mass flow rate of up to (8 – 10) ‧10-5 kg/s under a specific energy cost at 50 MJ/kg

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