Synthesis of Al2O3 Nanosized Powder by Pulsed Wire Discharge Using Gas Puff

Al2O3 nanosized powders were successfully synthesized by pulsed wire discharge (PWD) with gas puff. The experimental results have shown that, by using gas puff in O2 background pressure at 130 Pa, the deposited energy in the aluminum wire reached the same as vaporization energy of this wire. On the other hand, without gas puff, the deposited energy in the wire was the same as melting energy of this wire. The results of X-ray diffraction indicated that the synthesized powder with gas puff system consists of γ-Al2O3. The median diameter of γ-Al2O3 nanosized powder with gas puff was 4.9 nm. It indicated that the synthesis of Al2O3 at low pressure became to be possible by using gas puff combined with the PWD system.