Processing Characteristics Using Phosphorous Dielectric on Wire Electrical Discharge Machining of Polycrystalline Silicon

In this study, wire electrical discharge machining (WEDM) was implemented to process polycrystalline silicon ingot, and the influences on processing characteristics were examined. There are two different dielectrics, pure water and pure water with sodium pyrophosphate powder, that were experimented to compare their effects on cutting speed: kerf loss and surface roughness. In the experiment, sodium pyrophosphate powder has shown that it has enhanced process efficiency and has improved surface smoothness. From the results, it has been found that by using phosphorous dielectric, the cutting speed increased 2.4 times than pure water. Meanwhile, by using phosphorous dielectric, it caused high temperature and brought about the electrolysis effect, which improved its surface roughness enhanced 16% compared with pure water. This also decreased kerf loss and boosted up the material utilized. Through WEDM, high-temperature characteristic forces the phosphorous element of the dielectric to infiltrate on the cutting...