Microholes processes

Most electrochemical studies at the micro-ITIES were focused on ion transfer processes. Simple ion transfer reactions at the micropipette are characterized by an asymmetrical diffusion field. The transfer of ions out of the pipette (ejection) is controlled by essentially linear diffusion inside its narrow shaft, whereas the transfer into the pipette (injection) produces a spherical diffusion field in the external solution. In contrast, the diffusion field at a microhole-supported ITIES is approximately symmetrical. Thus, the theoretical descriptions for these two types of micro-ITIES are somewhat different. 

The tool-electrode feeding rate has to be selected properly. Feed rates faster than the mean material removal rate of the process will result in breaking either the workpiece or the tool-electrode. On the other hand, very slow feed rates will increase drilling times and may result in large heat affected zones around the microhole. So far only a few studies have been carried out on the optimal feeding rate. Typical values reported in the literature are, depending on the tool-electrode... 

Figure 10.22 shows a microhole with array of internal grooves fabricated by EMM. Here, EMM process are sequentially divided into drilling and grooving. The first step of the process is to drill a microhole in the workpiece. Then, the microtool electrode is moved to desired position of the microhole and eccentrically rotated to fabricate the microgroove. The distance between the axis of... 

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