타이타늄 터닝 스크랩의 전처리 및 Ca-Mg 복합 탈산을 활용한 저산소 분말 제조 Preparation of low-oxygen titanium powder using Ca-Mg combination deoxidation from pretreated titanium turning scrap원문보기
Titanium is widely used in aerospace and medical implants due to its high specific strength and excellent corrosion resistance. Accordingly, the generation of titanium scrap after mechanical processing or use is also increasing. These titanium scraps are exported to foreign countries at a low price ...
Titanium is widely used in aerospace and medical implants due to its high specific strength and excellent corrosion resistance. Accordingly, the generation of titanium scrap after mechanical processing or use is also increasing. These titanium scraps are exported to foreign countries at a low price and are being imported again as titanium ingots at high prices. In addition, the demand for metal powder according to the recent development of the additive manufacturing method is increasing. Therefore, in this study, hydrogenation-dehydrogenation comparison experiment was conducted between titanium turning scrap and titanium ingot for recycling of titanium alloy scrap. The titanium turning scrap was pretreated to remove impurities, and the pretreated scrap was used to cast an ingot through arc melting. The cast titanium ingot and compressed titanium turning scrap were charged into a hydrogenation furnace, and the hydrogenation effect according to hydrogen pressure was compared. The hydrogenated titanium turning scrap and ingot were pulverized to prepare powder, and dehydrogenation was performed in a vacuum heat treatment furnace. The powder thus prepared was pickled and washed with water, and then the titanium powder was dried in a vacuum chamber. The dried powder was subjected to XRD, SEM, and oxygen/nitrogen analysis to compare hydrogenation-dehydrogenation behavior. To manufacture titanium scrap into powder, a hydrogenation-dehydrogenation (HDH) process is used to increase the oxygen content of titanium. To solve this, calcium is used, but there is a disadvantage that the deoxidation temperature is relatively high. Therefore, in this study, magnesium was mixed with calcium and deoxidation was carried out at a low temperature. The titanium scrap was hydrogenated and pulverized to prepare titanium hydrogenated powder, and the powder was deoxidized at a temperature of 600°C to 800°C through steam deoxidation in a vacuum atmosphere using a composite deoxidizer mixed with calcium and magnesium. In addition, the hydrogenation powder and the dehydrogenation powder were deoxidized, and the final oxygen content was comparatively analyzed by deoxidation with the powder before and after dehydrogenation.
Titanium is widely used in aerospace and medical implants due to its high specific strength and excellent corrosion resistance. Accordingly, the generation of titanium scrap after mechanical processing or use is also increasing. These titanium scraps are exported to foreign countries at a low price and are being imported again as titanium ingots at high prices. In addition, the demand for metal powder according to the recent development of the additive manufacturing method is increasing. Therefore, in this study, hydrogenation-dehydrogenation comparison experiment was conducted between titanium turning scrap and titanium ingot for recycling of titanium alloy scrap. The titanium turning scrap was pretreated to remove impurities, and the pretreated scrap was used to cast an ingot through arc melting. The cast titanium ingot and compressed titanium turning scrap were charged into a hydrogenation furnace, and the hydrogenation effect according to hydrogen pressure was compared. The hydrogenated titanium turning scrap and ingot were pulverized to prepare powder, and dehydrogenation was performed in a vacuum heat treatment furnace. The powder thus prepared was pickled and washed with water, and then the titanium powder was dried in a vacuum chamber. The dried powder was subjected to XRD, SEM, and oxygen/nitrogen analysis to compare hydrogenation-dehydrogenation behavior. To manufacture titanium scrap into powder, a hydrogenation-dehydrogenation (HDH) process is used to increase the oxygen content of titanium. To solve this, calcium is used, but there is a disadvantage that the deoxidation temperature is relatively high. Therefore, in this study, magnesium was mixed with calcium and deoxidation was carried out at a low temperature. The titanium scrap was hydrogenated and pulverized to prepare titanium hydrogenated powder, and the powder was deoxidized at a temperature of 600°C to 800°C through steam deoxidation in a vacuum atmosphere using a composite deoxidizer mixed with calcium and magnesium. In addition, the hydrogenation powder and the dehydrogenation powder were deoxidized, and the final oxygen content was comparatively analyzed by deoxidation with the powder before and after dehydrogenation.
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