925 SILVER ALLOY FOR JEWELRY MANUFACTURING USING ADDITIVE MANUFACTURING, PART 1: OXIDE ON METAL POWDER SURFACE

Abstract

The purpose of the article is to investigate the oxides formed during gas atomization using 925 silver powder generated by gas atomization using a closed-coupled nozzle, influenced by a number of process parameters and the effect of process parameters on the characteristics of 925 sterling silver powder produced by various superheated gas atomization of the alloy melted at superheat temperatures of 1060, 1160, and 1260°C. The melt gas flow rate varied between 400, 500, and 600 l/min. The alloy powder size analysis was performed using X-ray fluorescence (XRF) particle characterization, and the powder morphology was analyzed using scanning electron microscope. The results of the experiment showed XRF containing 95.11% silver and 4.89% copper. Microscopic examination results nitrogen gas flow rates of 400, 500, and 600 L/min and temperatures used in parameters 1060, 1160, and 1260 °C under the experimental conditions, the temperature of 925 silver is the temperature used in parameters 1,060 °C nitrogen gas flow rates 600 l/min on the oxide surface during gas atomization and after production at different gas pressures and temperatures there are minimal complex shapes on the surface of the alloy powder.