Mechanisms of pulsating combustion during synthesis of advanced materials

Mukasyan, Alexander S.; Рогачев, А. С.; Varma, Arvind

doi:10.1002/aic.690451214

Cited by 23 publications

(13 citation statements)

References 16 publications

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“…2 shows that the motion of thermal propagation front at the CCSO can be structurally and thermally unstable at long times. Unlike in the gasless combustion as demonstrated in [16,17], not only auto oscillations, 1D pulsation and spin maybe observed, however, the complicated 3D finger front instability as described in [18,19] can be developed with time. Fig.…”

Section: Simulation Results and Discussionmentioning

confidence: 69%

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Simulation of front motion in a reacting condensed two phase mixture

Марков

Filimonov

Martirosyan³

2012

Journal of Computational Physics

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Section: Simulation Results and Discussionmentioning

confidence: 69%

“…Like in gasless combustion obtained in [16,17] the micro scale instability of CCSO is developed at high Pe T numbers. Therefore under such conditions temperature and concentration isolines are of stepwise type with discontinuous derivatives.…”

Section: Simulation Results and Discussionmentioning

confidence: 98%

Simulation of front motion in a reacting condensed two phase mixture

Марков

Filimonov

Martirosyan³

2012

Journal of Computational Physics

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“…13 However, values reported in the literature cover a wide range between 129.6 28 and 230 kJ mol −1 . 29 Because model prediction is indeed extremely sensitive to the H TiC 0 value used, its choice is of fundamental importance to correctly reproduce the experimental trend of maximum combustion temperatures.…”

Section: Comparison Between Model Results and Experimental Datamentioning

confidence: 99%

Combustion synthesis of metal carbides: Part II. Numerical simulation and comparison with experimental data

et al. 2005

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Based on the general theoretical model proposed in Part I of this work [J. Mater. Res. 20, 1257(2005], a series of numerical simulations related to the self-propagating high-temperature synthesis in the Ti-C system is presented. A detailed and quantitative description of the various physical and chemical processes that take place during combustion synthesis processes is provided in Part II of this work. In particular, the proposed mathematical description of the system has been discussed by highlighting the relation between system macroscopic behavior obtained experimentally with the modeled phenomena taking place at the microscopic scale. Model reliability is tested by comparison with suitable experimental data being nucleation parameters adopted for the fitting procedure. The complex picture emerging as a result of the model sophistication indicates that the rate of conversion is essentially determined by the rate of nucleation and growth. In addition, comparison between model results and experimental data seems to confirm the occurrence of heterogeneous nucleation in product crystallization.

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“…20) Indeed, the explanation of reactions mechanism for Ti-B-Co system is difficult and challenging, and it has not been determined or not reported yet.…”

Section: Introductionmentioning

confidence: 99%

“…6,[14][15][16][17][18] However, despite many advantages of the SHS such as applicability to synthesis of unique compounds or composites, it is difficult to control this process and to study the mechanism of reaction. 19,20) Such process is characterized by extremely high heating rates (up to 10 6 K/s), high temperature (up to 3 200 K for TiB2) and short time of reaction completion (usually less than 1 s, sometimes even 10 -3 -10 -2 s). The mechanism and kinetics of SHS as well as the combus-© 2012 ISIJ tion wave propagation rate depend on many physicochemical features of a reacting mixture in any particular case.…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution, Microstructure and Hardness of TiB2-based Co-containing Composite by SHS under Pseudo-isostatic Pressure

2012

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TiB2-based cermets with various Co contents were fabricated from elemental powders "in situ" by means of the Self-propagating High-temperature Synthesis, SHS, and Pseudo-Hot Isostatic Pressing, P-HIP method. The sample pressed into a cylindrical compact was ignited in a steel can by an external heating element coiling the can. After SHS initiation, which was detected by rapid temperature increase, the samples were quickly pressed pseudo-isostatically under a pressure of 192 MPa and held for 5 min. Samples with predominant concentration of TiB2, which varied from 70 to 85 vol.% with the addition of 5 vol% of Ti, were investigated in this study. Appreciable differences in terms of microstructure, density and hardness were observed depending on the composition. The average TiB2 grain size increased while porosity decreased with rising concentration of TiB2. The material synthesized with increased to 85% concentration of superhard TiB2 grains and minimized concentration of Co exhibited greatest densification, highest hardness of about 2 400 HV, and the most homogenous microstructure. The reaction mechanism was reportedly proposed, based on temperature monitoring during combustion and previously reported references.

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Mechanisms of pulsating combustion during synthesis of advanced materials

Cited by 23 publications

References 16 publications

Simulation of front motion in a reacting condensed two phase mixture

Simulation of front motion in a reacting condensed two phase mixture

Combustion synthesis of metal carbides: Part II. Numerical simulation and comparison with experimental data

Phase Evolution, Microstructure and Hardness of TiB2-based Co-containing Composite by SHS under Pseudo-isostatic Pressure

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