Application of microwave discharge for the synthesis of TiB2 and BN nano- and microcrystals in a mixture of Ti-B powders in a nitrogen atmosphere

Batanov, G. M.; Berezhetskaya, N. K.; Borzosekov, V. D.; Исхакова, Л. Д.; Колик, Л. В.; Konchekov, E. M.; Летунов, А. А.; Malakhov, D. V.; Milovich, F. O.; Obraztsova, Ekaterina A.; Petrov, A. E.; Sarksyan, K. A.; Скворцова, Н. Н.; Степахин, В. Д.; Kharchev, N. K.

doi:10.1134/s1063780x13100024

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…A specially designed plasma-chemical reactor (Figure 1, left) [8] was placed between two mirrors of the quasi-optical tract of the complex. Microwave breakdown in the reactor was initiated in air in the mixture of metal and dielectric powders placed on a quartz substrate with free upper surface (Figure 1, right).…”

Section: Synthesis In Gyrotron-initiated Discharge In Metal-dielectrimentioning

confidence: 99%

“…It was constructed in 2012 for plasma generation and heating in the L-2M stellarator. The plasma-chemical experiments were carried out in a specially constructed reactor [8] using gyrotron with a power up to 0.55 MW, frequency of 75 GHz, and microwave pulse duration between 0.1 and 15 ms. An actual gyrotron power was measured with a calorimeter [9]. The discharge was initiated in Ti + B, Mo + B, W + B, Mo + W + B, Mo + BN, Ti + KBF 4 , and Mg + CB 4 mixtures in the air and nitrogen atmospheres [8,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The plasma-chemical experiments were carried out in a specially constructed reactor [8] using gyrotron with a power up to 0.55 MW, frequency of 75 GHz, and microwave pulse duration between 0.1 and 15 ms. An actual gyrotron power was measured with a calorimeter [9]. The discharge was initiated in Ti + B, Mo + B, W + B, Mo + W + B, Mo + BN, Ti + KBF 4 , and Mg + CB 4 mixtures in the air and nitrogen atmospheres [8,10,11]. It was found that the surface temperature of the powder mixture in the breakdown phase for these discharges was 2000 to 5000 K, while the temperature in the plasma-gas layer reached 10000 K [11].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of oxide and nitride ceramics in high-power gyrotron discharge

Ахмадуллина

Скворцова

Obraztsova

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. Synthesis of oxides, nitrides, and oxynitrides of silicon and aluminium by a pulsed microwave discharge in the mixtures of metal and dielectric powders is described. The microwave pulses were generated by high-power gyrotron (frequency 75 GHz, power up to 550 kW, pulse duration from 0.1 to 15ms). SiO 2 + β-Si 3 N 4 (1:1 by molar) and α-Al 2 O 3 + AlN (2:1 by molar) mixtures with Mg (1 and 5wt%) were treated in air with microwave pulses with power of 250÷400 kW and duration of 2÷8 ms. It was found that the discharge cannot be initiated for both mixtures in absence of Mg at any pulse power and duration. When 1% of Mg was added, the discharge was observed for both mixtures under 8 ms pulses of 400 kW; however, the amounts of materials produced were not enough for analysis. With 5% of Mg the discharge was observed for both mixtures under 8 ms pulses of 350 kW, and products of the plasma-chemical processes in the Al 2 O 3 + AlN mixture were analyzed.

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Section: Synthesis In Gyrotron-initiated Discharge In Metal-dielectrimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of oxide and nitride ceramics in high-power gyrotron discharge

Ахмадуллина

Скворцова

Obraztsova

et al. 2017

J. Phys.: Conf. Ser.

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“…Наши предыдущие работы [6][7][8] были посвящены высокотемпературному синтезу веществ при взаимодействии порошков металл-диэлектрик с импульсным излучением гиротрона. Условия синтеза были схожи с FSP, мы наблюдали достаточно плотный для низкотемпературной плазмы (плотность электронов n e > 10 14 cm −3 ) слой с газовой температурой более 3000 K, с которым на протяжении более 1 ms взаимодействовали разлетающиеся частицы порошка.…”

Section: Introductionunclassified

Горение Частиц При Взаимодействии Излучения Гиротрона Со Смесью Порошков Металл/Диэлектрик

Заклецкий,

Гусейн-Заде,

Малахов

et al. 2023

Журнал Технической Физики

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As a result of interaction under normal conditions in an air atmosphere of a microwave pulse of a gyrotron with a mixture of Al/Al2O3 powders, ceramic particles of morphology microprocesses are synthesized. A variant of a multi-stage process for the development of physical and chemical processes in a reactor, taking into account ignition. After the end of the microwave pulse, a cloud is observed consisting of hot aluminum oxide particles and burning aluminum particles. A certain influence of the combustion process of aluminum particles on the products of plasma-chemical synthesis. The paper also determines the average velocity of particles from the powder mixture, the burning time of aluminum particles, the surface temperature of the particles of the powder mixture, and the temperature of the gaseous medium in the upper part of the plasma-chemical reactor.

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“…B–B is covalently bonded, and B–Ti is bounded by ion bonds [ 15 , 16 ]. The lattice parameters of TiB 2 are as follows: a = b = 3.029, c = 3.228, α = β = π/2, and γ = π/3 [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure of Nanocrystalline TiB2 Films Prepared by Chemical Vapor Deposition

Huang

Sun

et al. 2017

Materials

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Nanocrystalline titanium diboride (TiB2) ceramics films were prepared on a high purity graphite substrate via chemical vapor deposition (CVD). The substrate was synthesized by a gas mixture of TiCl4, BCl3, and H2 under 1000 °C and 10 Pa. Properties and microstructures of TiB2 films were also examined. The as-deposited TiB2 films had a nano-sized grain structure and the grain size was around 60 nm, which was determined by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. Further research found that a gas flow ratio of TiCl4/BCl3 had an influence on the film properties and microstructures. The analyzed results illustrated that the grain size of the TiB2 film obtained with a TiCl4/BCl3 gas flow ratio of 1, was larger than the grain size of the as-prepared TiB2 film prepared with a stoichiometric TiCl4/BCl3 gas flow ratio of 0.5. In addition, the films deposited faster at excessive TiCl4. However, under the condition of different TiCl4/BCl3 gas flow ratios, all of the as-prepared TiB2 films have a preferential orientation growth in the (100) direction.

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Application of microwave discharge for the synthesis of TiB2 and BN nano- and microcrystals in a mixture of Ti-B powders in a nitrogen atmosphere

Cited by 15 publications

References 9 publications

Synthesis of oxide and nitride ceramics in high-power gyrotron discharge

Synthesis of oxide and nitride ceramics in high-power gyrotron discharge

Горение Частиц При Взаимодействии Излучения Гиротрона Со Смесью Порошков Металл/Диэлектрик

The Microstructure of Nanocrystalline TiB2 Films Prepared by Chemical Vapor Deposition

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