Numerical analysis for micropyretic synthesis of NiAl intermetallic compound View Full Text


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Article Info

DATE

1995-09

AUTHORS

H. P. Li, J. A. Sekhar

ABSTRACT

A numerical investigation of the micropyretic synthesis response parameters of the Ni-Al stoichiometric compound was undertaken. The influence of the enthalpy of the combustion reaction,Q, activation ienergy,E, amount of diluent, pre-exponential factor,K0, and initial temperatureT0, on the combustion velocity, temperature, and mode was studied. The porosity of the unreacted compact, which is related to the initial compaction pressure, was considered in the calculation. It was found that the change in porosity significantly affects the thermal conductivity and the length of the pre-heat zone as also do the temperature patterns and propagation velocities. The combustion front was noted to be extinguished if the temperature in the reaction zone became lower than the melting point of the aluminium phase. This result was obtained simply by considering the changes in the thermal conductivity after the melting of aluminium without having to invoke any changes in the rate of reaction after the melting. A comparison of the numerical data with the experimental and analytical results was also made. More... »

PAGES

4628-4636

References to SciGraph publications

  • 1991-01. Thermodynamic predictions for the formation of ceramic-metal composite by self-propagating high-temperature synthesis in JOURNAL OF MATERIALS SCIENCE LETTERS
  • 1993-12. Influence of multi-dimensional oscillating combustion fronts on thermal profiles in JOURNAL OF MATERIALS SCIENCE
  • 1975-05. Gasless combustion of metal powder mixtures in COMBUSTION, EXPLOSION, AND SHOCK WAVES
  • 1991-12. Microstructural aspects of fabricating bodies by self-propagating synthesis in JOURNAL OF MATERIALS SCIENCE
  • 1971-01. Propagation of a pulsating exothermic reaction front in the condensed phase in COMBUSTION, EXPLOSION, AND SHOCK WAVES
  • 1992-01. Numerical modeling of solidification combustion synthesis in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1993-10. Rapid solidification by unstable combustion synthesis in JOURNAL OF MATERIALS RESEARCH
  • 1993-03. An investigation of the effect of porosity and diluents on micropyretic synthesis in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    http://scigraph.springernature.com/pub.10.1007/bf01153072

    DOI

    http://dx.doi.org/10.1007/bf01153072

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