Ceramic composites shaped by electrical discharge machining were examined by several analytical techniques, including scanning electron microscopy, XPS, elemental distribution maps, and hardness testing, to determine changes due to EDM and to compare these surfaces to those obtained by other machining methods. Preferential oxidation was observed for some composites, while others showed no chemical changes. Correlations for material removal rate, surface roughness, and diameter to depth ratio for the crater were developed.
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Gadalla et al. (1990) studied this question.
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