Select tantalum ingots with a tantalum content of more than 99.995% and hydrogenate and crush the tantalum ingots. The hydrogenated tantalum shavings were subjected to ball milling and crushing. The materials after ball milling and crushing were passed through a 400-mesh sieve, and the tantalum powder under the 400-mesh sieve was taken to obtain 20kg of tantalum particles of -400 mesh. Then the tantalum particles were loaded into the reaction bomb, heated under evacuated conditions, held at 750℃ for approximately 120 minutes, followed by cooling, removal from the furnace, and passing through 100 sieving to obtain 19.87kg of dehydrogenated tantalum powder. The dehydrogenated tantalum powder was loaded into the jet mill for jet shaping. During this process, the working pressure was 6.5kg, and the working frequencies of the first and second stages were 40Hz and 40Hz respectively. After shaping for 15 hours, 14.62kg of the first stage tantalum powder and 3.20kg of the second stage tantalum powder were obtained. The first-grade tantalum powder after air flow shaping was pickled with a mixed acid of HNO3 and HF (the volume ratio of HNO3, HF and water is 4:1:20) to remove metal impurities. After drying and sieving, 13.46kg of pickled tantalum powder was obtained. Then, the pickled tantalum powder is heat-treated under vacuum conditions of 10-1Pa, held at 1100℃ for 60 minutes, and finally cooled, passivated and taken out of the furnace. After heat treatment, the tantalum powder was mixed with 1.3% of the magnesium powder by weight of tantalum powder. Then, it was heated to 750℃ under the protection of inert gas and held for 2 hours. After that, the magnesium was removed by vacuuming for 3 hours. Finally, it was cooled down, passivated, and taken out of the furnace. The excess magnesium and magnesium oxide were washed with nitric acid. Then, it was washed with deionized water until neutral. The tantalum powder was dried and sieved. 12.74kg of tantalum powder was obtained.
Tantalum-tungsten alloy spherical powder, by using 3D printing technology, can be processed into personalized and small-batch irregular-shaped parts, improving material utilization and reducing manufacturing costs.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that specific embodiments of the present invention can still be modified or some technical features can be equivalently replaced. Without departing from the spirit of the technical solution of the present invention, all of them should be covered within the scope of the technical solution for which protection is sought by the present invention.
