Preparation of spheroidized W-Cu pseudo-alloy micropowder with sub-micrometer particle structure using plasma technology
The possibility to obtain composite micropowders of the W-Cu system with spherical particles having sub-microscale/nanoscale internal structure was confirmed and studied using the complex multistage approach.Composite W-Cu nanoparticles with core-shell structure(W cores and Cu shells)were produced in plasmochemical synthesis in the first stage.Further spray-drying of the aqueous suspension of the W-Cu nanopowder with sucrose enabled the formation of 25-63 μm microgranules with a yield of 50％.The last step was the treatment of the nanopowder microgranules by a thermal plasma jet,which ensured the production of dense spherical W-Cu particles.The final powder had a spheroidization degree of 90％-95％,a bulk density of up to 8.1 g/cm3 and a flowability of 12 s/50 g.The contents of impurities in the resulting spherical micropowder were 0.7 wt.％O,0.02-0.2 wt.％C and 0.03-0.05 wt.％H.
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