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COMBUSTION REACTIONS OF SOME “METAL-METAL OXIDE” SYSTEMS UNDER CONDITIONS OF ZERO AND APPLIED MAGNETIC FIELDS: TRXRD EXPERIMENTS
https://doi.org/ 10.15518/isjaee. 2014.20.004
Abstract
The effect of an external magnetic field of 0.2 T on the self-propagating high temperature syntheses (SHS) of a mixture of first row transition metals (Ni and Ti) and their oxides with and without addition of internal solid oxidizer (sodium perchlorate - NaClO4) was studied by time resolved X-ray diffraction using the Rietveld refinement for determination of phase percentages. The driving force for the reactions is the oxidation of the appropriate metal powder. Reactions typically reached temperatures in excess of 11500C with a timescale for the complete conversion of reactant to products of 20 s. This enabled accurate monitoring of the combustion process in particular propagation velocity, maximum temperature, cooling rates, synthesis wave width, and pathway. Several interesting phenomena, such as combustion wave segmentation were detected in some systems. All the final products were characterized by X-ray powder diffraction (XRD), energy dispersive X-ray analysis (EDXA) and scanning electron microscopy (SEM).
Keywords
металл-оксидные системы,
приложенное магнитное поле,
самораспространяющийся высокотемпературный синтез (СВС),
распространение волны горения,
динамические рентгеновские эксперименты с временным разрешением (TRXRD),
возникающие при горении полости,
сегментация,
metal-oxide systems,
applied magnetic field,
self-propagating high-temperature synthesis (SHS),
combustion wave propagation,
time-resolved X-ray diffraction (TRXRD),
combustion holes,
segmentation
About the Authors
Rajeevan Sivasubramanaiam
University College London
Russian Federation
Russian Federation
Gavin Vaughan
European Synchrotron Radiation Facility (ESRF)
Russian Federation
Russian Federation
Maxim V. Kuznetsov
All-Russian Scientific-Research Institute for Problems of Civil Defense and Emergencies (Federal Center of Science and hi-Tech)
Russian Federation
Russian Federation
Ivan P. Parkin
University College London
Russian Federation
Russian Federation
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Review
For citations:
Sivasubramanaiam R., Vaughan G., Kuznetsov M.V., Parkin I.P. COMBUSTION REACTIONS OF SOME “METAL-METAL OXIDE” SYSTEMS UNDER CONDITIONS OF ZERO AND APPLIED MAGNETIC FIELDS: TRXRD EXPERIMENTS. Alternative Energy and Ecology (ISJAEE). 2014;(20):47-61. (In Russ.) https://doi.org/ 10.15518/isjaee. 2014.20.004
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