The Study of Ignition Parameters for Energy Efficient Processing of High Temperature Non-Oxide Ceramics by the Micropyretic Synthesis Route

The influence of ignition parameters for energy efficient processing of high temperature non-oxide ceramics by the micropyretic synthesis route is studied numerically in this article. The simulation results show that a lower ignition power leads to longer ignition time to initiate reactions. An increase in the ignition time also increases the length of pre-heating zone before propagating, which further changes the initiate propagation velocity and oscillatory frequency of the temperature variations. Such changes in the initiate propagation velocity and temperature variations result in inhomogeneous structures at the ignition spot. The simulation also indicates that using a higher power to ignite the micropyretic reactions can lower the ignition time and further prevent the inhomogeneous structures from being formed at the ignition spot. However, more heat loss is noted to occur due to a high temperature gradient and the energy required to ignite the reaction. The numerical calculation indicates that there is a 20 % increase in the required energy and a 90% decrease in the required time to ignite the specimen when the ignition power is increased from 87.5 kJ/(g・s) to 962.5 kJ/(g ・s). In addition, the effect of the individual material property on ignition is also investigated.

[1]  M. Pantoya,et al.  Nano-scale reactants in the self-propagating high-temperature synthesis of nickel aluminide , 2004 .

[2]  H. P. Li The numerical simulation of the porosity effect on the unstable propagation during micropyretic synthesis , 2004 .

[3]  D. Clark,et al.  Ignition behavior and characteristics of microwave-combustion synthesized Al2O3–TiC powders , 2004 .

[4]  Hung‐Pin Li Numerical study of the second ignition for combustion synthesizing Ni-Al compounds , 2003 .

[5]  H. P. Li The numerical simulation of the heterogeneous composition effect on the combustion synthesis of TiB2 compound , 2003 .

[6]  U. Tamburini,et al.  Ignition mechanism in combustion synthesis of Ti–Al and Ti–Ni systems , 2003 .

[7]  Haibin Yang,et al.  Fabrication of intermetallic NiAl by self-propagating high-temperature synthesis reaction using aluminium nanopowder under high pressure , 2002 .

[8]  Z. Guo,et al.  Study on laser ignition of Ni-33.3at%Al powder compacts , 2000 .

[9]  J. A. Sekhar,et al.  Micropyretic synthesis of NiAl containing Ti and B , 2000 .

[10]  Stephen C. Hwang,et al.  Combustion Wave Microstructure in Gas-Solid Reaction Systems:Experiments and Theory , 1997 .

[11]  H. P. Li,et al.  The influence of the reactant size on the micropyretic synthesis of NiAl intermetallic compounds , 1995 .

[12]  J. A. Sekhar,et al.  Dynamic modeling of the interaction of gas and solid phases in multistep reactive micropyretic synthesis , 1995 .

[13]  W. Lee,et al.  Ignition phenomena and reaction mechanisms of the self-propagating high-temperature synthesis reaction in the Ti+C system , 1995, Journal of Materials Science.

[14]  J. A. Sekhar,et al.  Analytical modeling of the propagation of a thermal reaction front in condensed systems , 1994 .

[15]  J. A. Sekhar,et al.  Influence of multi-dimensional oscillating combustion fronts on thermal profiles , 1993 .

[16]  H. P. Li,et al.  Rapid solidification by unstable combustion synthesis , 1993 .

[17]  S. B. Bhaduri,et al.  Metal-ceramic composites based on the Ti-B-Cu porosity system , 1992 .

[18]  A. K. Bhattacharya,et al.  Numerical modeling of solidification combustion synthesis , 1992 .

[19]  Giacomo Cao,et al.  Self-propagating solid-solid noncatalytic reactions in finite pellets , 1990 .

[20]  Z. A. Munir,et al.  Self-propagating exothermic reactions: the synthesis of high-temperature materials by combustion , 1989 .

[21]  A. Merzhanov,et al.  Theory of combustion waves in homogeneous media , 1988 .

[22]  Jan Degrève,et al.  Modeling of exothermic solid-solid noncatalytic reactions , 1987 .

[23]  J. B. Holt,et al.  The combustion synthesis of refractory nitrides , 1987 .

[24]  V. M. Shkiro,et al.  Structure of fluctuations occurring in the burning of tantalum-carbon mixtures , 1978 .

[25]  Yu. S. Naiborodenko,et al.  Gasless combustion of metal powder mixtures , 1975 .

[26]  A. Merzhanov,et al.  The present state of the thermal ignition theory: An invited review , 1971 .

[27]  Yu. S. Naiborodenko,et al.  Reactions at phase boundaries and their effects on the sintering process , 1970 .

[28]  A. Merzhanov The theory of stable homogeneous combustion of condensed substances , 1969 .

[29]  J. Walton,et al.  Cermets From Thermite Reactions , 1959 .

[30]  F. Booth The theory of self-propagating exothermic reactions in solid systems , 1953 .

[31]  B. Lewis,et al.  Theory of Flame Propagation. , 1934 .