Research of Nano-powder Made from New-type Plasma Arc Evaporation System
A laboratory-made equipment was developed and fabricated in this study to produce nanopowder. According to the published papers and patents a new equipment is designed and tested in our department. This equipment uses plasma arc as a heating source. In this heating source, all of the metal and ceramics materials can be vaporized. This equipment is also effective, inexpensive and suitable to a laboratory scale. The collected powders from different positions in the aluminum foil and cold-trap of the chamber were analyzed using SEM and XRD. The characteristic and stability of this equipment was also evaluated. The experiment result shows that the average particle diameter of TiO2 powder is about 20nm. The powder obtained from aluminum foil is 10~20 times the average particle diameter of that obtained from cold-trap. The size of the average particle diameter of powder is related to the position where powder obtained. The far from the vapor source, the larger the average particle diameter of powder. Due to more irradiation, powder with larger particle diameter can be obtained in the upper part of the chamber. In this experimental system, the Rutile phase have more ratios in the powder of TiO2. This shows the powder have changed its phase during fabricating process because of the influence of irradiation heat. Compared with powder of TiO2 obtained from abroad, this experimental system can produce powder with a particle diameter of less than 10 nm. Therefore, this equipment have a good potential to a future study.