Journal
MATERIALS
Volume 14, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/ma14154258
Keywords
tungsten carbides; cobalt; nanopowder; synthesis; granulation; spheroidization; DC thermal plasma
Categories
Funding
- Russian Science Foundation [19-73-00275]
- Russian Science Foundation [19-73-00275] Funding Source: Russian Science Foundation
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The possibility of obtaining composite micropowders of the W-C-Co system with a spherical particle shape having a submicron/nanoscale internal structure was experimentally confirmed. The method involved plasma-chemical synthesis to produce nanopowders, followed by spray drying to obtain dense microgranules, and finally plasma treatment to achieve spherical micropowders without internal cavities. Experiment results showed that the plasma treatment process parameters significantly influenced the dispersity, phase, and chemical composition of the spherical micropowders.
The possibility of obtaining composite micropowders of the W-C-Co system with a spherical particle shape having a submicron/nanoscale internal structure was experimentally confirmed. In the course of work carried out, W-C-Co system nanopowders with the average particle size of approximately 50 nm were produced by plasma-chemical synthesis. This method resulted in the uniform distribution of W, Co and C among the nanoparticles of the powder in the nanometer scale range. Dense microgranules with an average size of 40 microns were obtained from the nanopowders by spray drying. The spherical micropowders with an average particle size of 20 microns were received as a result of plasma treatment of 25.36 microns microgranule fraction. The spherical particles obtained in the experiments had a predominantly dense microstructure and had no internal cavities. The influence of plasma treatment process parameters on dispersity, phase, and chemical composition of spherical micropowders and powder particles microstructure has been established.
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