The energy required to ignite micropyretic synthesis. Part II: unstable Ti + 2B reaction
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In the previous study, the influences of micropyretic parameters on the ignition energy for lower exothermic heat and lower activation energy of stable Ni–Al reaction have been studied. In this study, we studied the effect of ignition energy on the unstable Ti + 2B micropyretic reaction, which has higher exothermic heat and higher activation energy. Three-dimensional maps are generated to illustrate the influences of micropyretic synthesis parameters on the required ignition energy. In addition, the comparisons in the ignition energy for the micropyretic reactions with Ni + Al and Ti + 2B are studied. The numerical calculation indicates that the changes in the ignition energy caused by the thermal conductivity for the micropyretic reaction with Ti + 2B is smaller as compared with for the micropyretic reaction with Ni + Al. However, the required ignition power is found to significantly change with the thermal conductivity for the NiAl micropyretic reaction when a higher pre-exponential factor is taken in the calculation. In addition, the difference in the required ignition energy caused by the thermal conductivity is noted to be larger for the Ni–Al micropyretic reaction with a lower pre-exponential factor.
KeywordsHeat Capacity Heat Loss Combustion Front Ignition Time Zone Length
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.
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