Nanosized Powder Synthesis by Pulsed Wire Discharge in High-Speed Gas Flow

抄録

Copper nanosized powders were successfully synthesized by pulsed wire discharge (PWD) in high-speed gas flow. The maximum pressure of the gas blowing from the gas puff apparatus developed for PWD was 22 kPa at plenum pressure of 0.4 MPa. The experimental results have shown that, by using gas puff at background pressure of 130 Pa, the electrical energy deposition into the wire reached 40 J, which is almost the same as that obtained at pressure of 5 kPa without gas puff. However, the average particle size decreased from 39 nm (at steady pressure of 5 kPa) to 16 nm (at background pressure of 130 Pa with gas puff). Therefore, it has been proved that the gas puff has significant effect in the reduction of average particle size.