Anode-grid assembly

FIGURE 5.23. ELTECH s MDC cell (a) Brine feed rotameter (b) Head sight glass (c) Cell head (d) Cathode assembly (e) Tbbe sheet (f) Grid plate (g) Cathode tube (h) Grid protector (i) DSA expandable anode. (With permission flom ELTECH Systems Coiporaticxi.)... 

FIGURE 5.29 The internal arrangement of the anode, screen, control grid, and cathode assemblies of a tetrode power tube. 

The density of IC packaging technologies such as ball grid array (BGA) and chip scale packages continues to increase. In turn, this requires greater intercoimection density in the printed circuits onto which they are assembled. The need for increased density in the PCB impacts each of the components of the base material as well as the way in which they are manufactured. To achieve high levels of interconnection, component pitch densities result in smaller and more closely spaced plated through holes and circuit features. As the space between these holes and features decreases, the potential for conductive anodic filament (CAE) failures increases substantially. 

In 1970, J. E. Wynn (in Koscher et al. 2003) described a fuel cell that contains three electrodes, an anode, a cathode and a grid electrode (Fig. 13). The anode consisted of an unsintered Ag/PdO catalyst in a carbon/ polytetrafluoroethylene (PTFE) bonded structure. The cathode consisted of a platinized carbon/PTFE bonded structure (15% Pt by wt.). A mixture of 9 M KOH and 6 M methanol was used as the anolyte and 9 M KOH solution was used as the catholyte. The anolyte was separated from the catholyte by an anion exchange membrane. The third electrode, a platinum catalyzed nickel grid, was placed in-between the membrane and the cathode. The grid electrode was electrically connected to thecatbode through a small resistance. The three-electrode cell assembly was used to reduce the unwanted methanol oxidation at cathode. Any methanol that... 

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