Abstract
The progression of chemical reactions is determined by both thermodynamics and kinetics factors. Micropyretic/combustion reaction is a cascade of many chain chemical reactions and thermodynamics and kinetics of the ignition reaction are expected to greatly affect the overall reaction outcome. Furthermore, the stability of the sequential reaction and its progression are correspondingly changed once micropyretic parameters are changed. Improper ignition of micropyretic reaction provides either excessive or insufficient external energy, thus causes over-heating or extinguishing of the combustion front during propagation and therefore the heterogeneous structures. To achieve the homogeneous micropyretic reaction, it is thought possible to control ignition energy. A numerical study on the correlation of thermodynamics and kinetics factors of ignition on the stable Ni + Al reaction and the required ignition energy is reported in this study. The influences of activation energy (E), enthalpy of the micropyretic reaction (Q), pre-exponential factor (K o), thermal conductivity (K), heat capacity (C p), and thermal activity of the reactants and product, on the temperature/heat loss at the ignition spot and the length of pre-heating zone are respectively studied. It is found that the activation energy and heat capacity have the most significant effects on the ignition energy. The required ignition energy is increased by 44.0% and 23.9%, respectively, when the activation energy and the heat capacity are both increased by 40.0%
Similar content being viewed by others
References
Lakshmikantha MG, Bhattacharys A, Sekhar JA (1992) Metall Trans A 23A:23
Lakshmikantha MG, Sekhar JA (1993) Metall Trans A 24:617
Subramanian V, Lakshmikantha MG, Sekhar JA (1995) J Mater Res 10:1235
Munir ZA, Anselmi-Tamburini U (1989) Mater Sci Rep 3:277
Merzhanov AG, Khaikin BI (1988) Prog Energ Combust Sci 14:1
Li HP (2002) J Mater Res 17:3213
Li HP (2003) Acta Mater 51:3213
Li HP (2003) Metall Mater Trans A 34(9):1969
Li HP (2004) Scripta Mater 50(7):999
Li HP (2005) Chem Eng Sci 4:925
Li HP (2005) Acta Mater 53:2405
Lee WC, Chung SL (1995) J Mater Sci 30:1487
Shen P, Guo ZX, Hu JD, Lian JS, Sun BY (2000) Scripta Mater 43:893
Bertolino N, Monagheddu M, Tacca A, Giuliani P, Zanotti C, Tamburini UA (2003) Intermetallics 11:41
Deidda C, Delogu F, Maglia F, Anselmi-Tamburini U, Cocco G (2004) Mater Sci Eng A 375–377:800
He C, Stangle GC (1998) J Mater Res 13(1):135
Dong S, Hou P, Cheng H, Yang H, Zou G (2002) J Phys-Condens Mat 14(44):11023
Hunt EM, Plantier KB, Pantoya ML (2004) Acta Mater 52(11):3183
Brain I, Knacke O, Kubaschewski O (1973) Thermochemical properties of inorganic substances. Springer-Verlag, New York
Lide DR (1990) CRC handbook of chemistry, physics. CRC, Boca Raton
Brandes EA, Brook GB (1992) Smithells metals reference book. Butterworth-Heinemann Ltd
Naiborodenko YS, Itin VI (1975) Combust Explos Shock Waves 11(3):293
Acknowledgements
The supports from National Center for High-Performance Computing (account number: u48hpl00) and National Science Council (Grant number: NSC95-2221-E-228-002) in Taiwan are acknowledged.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Li, H.P. The energy required to ignite micropyretic synthesis. Part I: stable Ni + Al reaction. J Mater Sci 43, 1688–1695 (2008). https://doi.org/10.1007/s10853-007-2370-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-007-2370-7