Abstract
The electrodischarge compaction (EDC) experiment by Davies and Al-Hassani for nickel powders has been re-analyzed, and additional EDC experiments were carried out using deliberately oxidized nickel powders to understand the mechanism of the oxide disruption and neck formation during passage of a high voltage and high density current. Detailed analysis of power-discharge time curves obtained by Davies and Al-Hassani and also by the present authors was performed together with microstructural observation of the neck interface. It is proposed that the EDC process consists of four stages: stage I, electronic breakdown of oxide films and heat accumulation at the metal- oxide interface; stage II, physical breakdown of oxide film due to sublimation of the metal under the oxide film; stage III, neck formation; stage IV, neck growth and dissipation of energy through the conductive mass.
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