Initiation of SHS processes

Barzykin, V. V.

doi:10.1351/pac199264070909

Cited by 43 publications

(18 citation statements)

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“…It is interesting to note that the trends reported in Fig. 5a reproduce closely experimental observations reported by Barzykin in the case of the ignition of TiC [4].…”

Section: The Effect Of Thermal Conductivitysupporting

confidence: 87%

“…Barzykin published the only comprehensive review on this topic, summarizing its experimental and theoretical aspects [4]. In general, the early theoretical works were based on a homogeneous pre-mixed flame model [5e7].…”

Section: Modeling the Ignition Process In The Shs Of Transition Metalmentioning

confidence: 99%

“…We indicated before the distinction between temperaturecontrolled and heat flux-controlled ignition conditions [4]. This distinction has been largely used in traditional combustion studies because the use of simplified boundary conditions allows an easier analytical solutions of the systems of Eq (1).…”

Section: Ignition Diagramsmentioning

confidence: 99%

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Modeling the ignition of self-propagating combustion synthesis of transition metal aluminides

et al. 2010

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“…It is interesting to note that the trends reported in Fig. 5a reproduce closely experimental observations reported by Barzykin in the case of the ignition of TiC [4].…”

Section: The Effect Of Thermal Conductivitysupporting

confidence: 87%

Section: Modeling the Ignition Process In The Shs Of Transition Metalmentioning

confidence: 99%

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Modeling the ignition of self-propagating combustion synthesis of transition metal aluminides

et al. 2010

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“…Particle size of the powder was found to have a great influence on propagation wave velocity, for example by increasing the particle size from 0.05 to 3 mm Munir et al observed a velocity drop from 4.5 cm/s to 0.7 cm/s in a mixture of titanium and carbon 40 . A SHS reaction is associated with a combustion process after local initiation which can be induced using different methods such as placing a coil wire 44 , by laser radiation or by spark ignition 45 . Here the spark initiation is provided by ignition of UC.…”

Section: Ignition Of Ucmentioning

confidence: 99%

Oxidation of UC: An in situ high temperature environmental scanning electron microscopy study

Gasparrini

Podor

Horlait

et al. 2017

Journal of Nuclear Materials

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Abstract. In situ HT-ESEM oxidation of sintered UC fragments revealed the morphological changes occurring during the transformation between UC to UO2 and UO2 to U3O8 at 723 to 848 K and in an atmosphere of 10 to 100 Pa O2. Two main oxidation pathways were revealed. Oxidation at 723 K in atmospheres ≤ 25 Pa O2 showed the transformation from UC to UO2+x, as confirmed by post mortem HRTEM analysis. This oxidation pathway was comprised of three steps: (i) an induction period, where only surface UC particles oxidised, (ii) a sample area expansion accompanied by crack formation and propagation, (iii) a stabilisation of the total crack length inferring that crack propagation had stopped. Samples oxidised under 50 Pa O2 at 723 K and at 773 -848 K for 10 to 100 Pa O2 showed an "explosive" oxidation pathway: (i) sample area expansion occurred as soon as oxygen was inserted into the chamber and crack propagation and crack length followed an exponential law; (ii) cracks propagated as a network and the oxide layer fragmented, (iii) an "explosion" occurred causing a popcorn-like transformation, typical for oxidation from UO2 to U3O8. HRTEM characterisation revealed U3O8 preferentially grow in the [001] direction. The explosive growth, triggered by ignition of UC, proceeded as a self-propagating high-temperature synthesis reaction, with a propagation speed of 150-500 ± 50 µm/s.

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“…These materials generally burn through a Self-propagating High-temperature Synthesis (SHS) process whose kinetics are dominated by heat diffusion [2,3], and can be greatly activated by reducing the diffusion distances through nano-scale mixing [4,5]. Many mixtures react with little or no gas production, however, the possibility of supersonic reactive waves has nevertheless been suggested [6], on condition of exothermicity, positive volume expansion, and sufficiently high reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Enhanced reactivity of mechanically-activated nano-scale gasless reactive materials consolidated via the cold-spray technique

Bacciochini¹,

Radulescu²,

Charron-Tousignant³

et al. 2012

AIP Conference Proceedings

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Abstract. The present study presents a novel method to prepare nano-scale energetic materials with high reactivity, vanishing porosity, structural integrity and arbitrary shape. The experiments have focused on the Ni-Al system. To increase the reactivity, an initial mechanical activation was achieved by the ball milling technique. The consolidation of the materials used the supersonic cold gas spray technique, where the particles are accelerated to high speeds and consolidated via plastic deformation upon impact, forming activated nanocomposites in arbitrary shapes with close to zero porosity. This technique permits to retain the microstructures in the powders and prevents any reactions during the consolidation phase. The material reactivity is addressed through the flame propagation velocity, which showed an increase in the flame speed of the cold sprayed samples by up to one order of magnitude compared to their cold pressed counterparts.

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Initiation of SHS processes

Cited by 43 publications

References 0 publications

Modeling the ignition of self-propagating combustion synthesis of transition metal aluminides

Modeling the ignition of self-propagating combustion synthesis of transition metal aluminides

Oxidation of UC: An in situ high temperature environmental scanning electron microscopy study

Enhanced reactivity of mechanically-activated nano-scale gasless reactive materials consolidated via the cold-spray technique

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