Field-assisted combustion synthesis

Details Field-assisted combustion synthesis Field-assisted combustion synthesis

1993-03-08

1995-01-10

Gorgos, Kathryn

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

75 101, 264 22, 264 27, 204 59R, C25F 500

Patent

active

053804090

ABSTRACT:
A method of combustion synthesis is provided wherein a relatively low field or voltage is applied to a precursor material prior to ignition. The field is at a voltage level effective to energize the material such that a combustion wave is propagated in a controlled manner through the material and without substantial Joule heating prior to ignition of the material, but below voltage levels necessary to initiate combustion. The precursor material, typically comprising a mixture of components which contain stoichiometric amounts of the elements in the desired final product in powder form, is compressed to form a compact having a desired relative density. This compact is subjected to an electric field or voltage at a suitable energy level to achieve the desired energizing of the material. The thus-treated compact is then ignited at a suitable location by, e.g., radiative energy applied from an ignition means. Once ignition occurs, the applied electric field serves to sustain the propagation of the combustion wave in a positive manner.

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