بهينه‌سازي فرايند كروي‌سازي پلاسمايي براي ساخت پودرهاي فلزي مناسب براي روش‌هاي ساخت افزايشي

In recent years, special attention has been paid to the additive manufacturing technology of advanced engineering parts. One of the main types of these processes is the powder bed fusion methods, in which various metal powders are used. The powders used in these methods must have certain characteristics such as morphology, particle size, particle size distribution an‎d percentage of sphericity. Radiofrequency plasma spheroidization is a useful an‎d practical process in which plasma is used to synthesize, process, purify an‎d spheroidize a wide range of metal powders. It has been found that powder particles with spherical geometry are of particular importance for the creation of denser powder layers, which leads to more desirable properties with fewer defects in additively manufactured parts. The radio frequency plasma spheroidization process has a good ability to optimize the geometry, particle size an‎d particle size distribution of various metal powder particles. In the current study, the effect of various variables of the radio frequency plasma spheroidization process on the properties of 316L stainless steel powder has been investigated. The process variables including powder feed rate, core gas flow rate, carrier gas flow rate, shielding gas flow rate an‎d power supply power have been investigated separately. Also, using numerical simulation of this process, the changes in temperature gradient an‎d plasma shape, fluid velocity in the chamber an‎d magnetic flux under different process conditions were predicted an‎d measured to determine the optimal conditions of the variables for the existing radio frequency system. In the end, it was determined that the best range for the process variables of the existing system was a central gas flow rate of 5 to 15 liters per minute, a carrier gas flow rate of 1 to 2.5 liters per minute, a shielding gas flow rate of 0 to 5 liters per minute, an‎d a power of 20 to 26 kW.

احمد كرمانپور , احمد رضائيان

مهران نحوي , قاسم عظيمي روئين