Gaz atomizasyonu ile metal tozu üretimi

ABSTRACT PRODUCTION OF METAL POWDERS BY GAS ATOMIZATION YILMAZ, Necip Fazıl M.S. in Mechanical Engineering Supervisor: Assist. Prof. Dr. Cengiz DO?AN June, 1996, 80 pages In this study, a gas atomization unit for metal powder production has been modified. Instead of tundish and melting of metal, a melting unit working with an electric arc has been used. This unit consists of high current, low voltage power source, compressed air, nozzle and electrode feeding mechanism. In the experimental set-up two different metal wires which are driven by feed drive mechanism, are melted by means of an electric arc developed between the ends of the wires. A nozzle directs the compressed air to the arc and atomise the molten metal. Produced powders are quenched in the water before the solidification to obtain complex shapes. Direct current power source used in the experiment, automatically adjusts the current according to selected voltage. In the experiments, steel, brass and aluminium wires with different diameters were atomized. Characteristics of the produced metal powders are investigated in terms of size and the microscopic structure. Mean powder sizes for steel, brass and aluminium are 121 urn, 88 ym and 88 urn respectively. Key Words: Metal arc spraying, atomization III