A thermal analysis on self-propagating high temperature synthesis in joining technology

Fiedler, Thomas; Belova, Irina V.; Broxtermann, S.; Murch, Graeme E.

doi:10.1016/j.commatsci.2011.08.015

Cited by 26 publications

(8 citation statements)

References 14 publications

(17 reference statements)

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“…The classical theory for ignition involves heat generated locally by a chemical reaction and heat propagation through the sample. We ignore the effect of reactive gas depletion or the evolution of the system parameters during the reaction.…”

Section: The Modelmentioning

confidence: 99%

The critical condition for thermal explosion in an isoperibolic system

2017

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Knowing the conditions for a system to undergo thermal explosion is of utmost importance for many applications. A critical condition that accounts for reactant consumption and covers most practical situations, including low activation energy reactions is presented. Our solution applies to cylindrical reactors of any radius to height ratio. In the case of films, it is shown that thermal explosion is virtually impossible. A new criterion to define the boundary of thermal run- away based on heat balance is introduced. This new definition of criticality allows us to check the accuracy of the non- stationary model to describe the critical condition. The nonstationary model is the base of most approache

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Section: The Modelmentioning

confidence: 99%

The critical condition for thermal explosion in an isoperibolic system

2017

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“…Actually, the SHS reaction could be easily ignited using a lighter (Figure S4), and the samples need not been preheated. The phenomenon of the SHS process shown in Figure S4b also demonstrates that the SHS reaction belongs to point-heating and not synchro-heating. − Moreover, at such high temperatures as that produced by SHS, the incendive trace impurities such as resin and graphite can be burnt efficiently in air, resulting in the removal of these impurities while avoiding contamination. , …”

Section: Resultsmentioning

confidence: 93%

Reclamation and Harmless Treatment of Waste Cathode Ray Tube Phosphors: Novel and Sustainable Design

Yin

Tian

et al. 2018

ACS Sustainable Chem. Eng.

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In this paper, we propose a novel and sustainable process for recycling rare earths (REs) and zinc (Zn) simultaneously from waste cathode ray tube (CRT) phosphors. First, 95% of the impurities such as glass cullets and aluminum foils are removed by simple screening. Then, a selfpropagating, high-temperature synthesis reaction following a water-leaching process is performed to recycle Zn selectively. The REs are recycled by a combined process of oxidative leaching and ionic-liquid-based extraction. They are then regenerated to form a new Y 2 O 3 :Eu 3+ phosphor. By following this green recycling design, the recovery efficiencies of REs and Zn reach 99.5% and 99%, respectively. The negative bivalent sulfur in ZnS and Y 2 O 3 :Eu 3+ is converted completely to SO 4 2− , which efficiently avoids the secondary pollution. It should also be pointed out that the main recovery processes are all carried out at room temperature, and the "three wastes" emissions are minimized throughout the process. This work is expected to open new avenues for highly efficient, energy-saving, and pollutionreducing recovery processes for waste CRT phosphors.

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“…The model is based on the classical theory for ignition and front propagation in solid samples [11,21,30,[32][33][34][35]. The heat balance is the result of two opposite effects: heat generation by chemical reaction and heat removal through thermal conduction.…”

Section: The Modelmentioning

confidence: 99%

The critical conditions for thermal explosion in a system heated at a constant rate

Sánchez-Rodríguez

Farjas

Roura

2017

Combustion and Flame

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We have analyzed the condition needed for thermal explosion to occur in a solid sample when the tem- perature of the vessel walls is raised at a constant rate. We have developed a dimensionless model that allows its direct comparison with an isoperibolic system (constant vessel wall temperature). We have obtained an analytical expression for the critical condition as a function of the system parameters. Our solution takes into account reactant consumption and covers different geometries: thin film, finite and infinite cylinder. The critical condition has been validated with numerical simulations and experiments. We show that, compared to the isoperibolic system, thermal explosion is a little bit more difficult to achieve under constant heating conditions. Besides, we show that thermal explosion on submicrometric films is nearly impossibl

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A thermal analysis on self-propagating high temperature synthesis in joining technology

Cited by 26 publications

References 14 publications

The critical condition for thermal explosion in an isoperibolic system

The critical condition for thermal explosion in an isoperibolic system

Reclamation and Harmless Treatment of Waste Cathode Ray Tube Phosphors: Novel and Sustainable Design

The critical conditions for thermal explosion in a system heated at a constant rate

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