Abstract
Eleven materials, including eight ceramics, were electric discharge machined using two different conditions. The surface topographies were examined qualitatively, and profiles were recorded. Four conventional roughness parameters were calculated, in addition to two parameters derived from fractal plots: slope and threshold. These parameters are analyzed for covariance, coefficient of variation and their abilities to differentiate materials and machining conditions. The conventional roughness parameters all correlate reasonably well with each other, as do Rz and Rpm with the slope of the fractal plot, indicating that they contain superfluous information. None of the parameters examined are able to differentiate the two machining conditions. All the parameters, with the exception of the Rpm:Rz ratio, are able to differentiate the materials, significant at greater than 97.5%. confidence. The slope of the fractal plot appears to be an indication of complexity of the topographies, and of the amount of TiC or TiN phase in some ceramic-ceramic composites.
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