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Preparation of W-C-Co Composite Micropowder with Spherical Shaped Particles Using Plasma Technologies.

Andrey Samokhin1, Nikolay Alekseev1, Aleksey Astashov1

  • 1Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences, 49, Leninskiy prosp., 119334 Moscow, Russia.

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Summary

Researchers successfully created spherical W-C-Co composite micropowders with nanoscale structures using plasma-chemical synthesis and spray drying. These dense, submicron powders offer uniform composition for advanced material applications.

Keywords:
DC thermal plasmacobaltgranulationnanopowderspheroidizationsynthesistungsten carbides

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Powder Metallurgy

Background:

  • Tungsten-Carbon-Cobalt (W-C-Co) composites are crucial for hard materials.
  • Achieving uniform nanoscale structures in W-C-Co powders presents significant challenges.
  • Spherical particle morphology is desirable for improved powder flow and packing density.

Purpose of the Study:

  • To experimentally confirm the feasibility of producing W-C-Co composite micropowders with spherical morphology and submicron/nanoscale internal structure.
  • To investigate the effects of plasma treatment on the properties of W-C-Co powders.
  • To establish relationships between process parameters and powder characteristics.

Main Methods:

  • Plasma-chemical synthesis for producing W-C-Co nanopowders (average size ~50 nm).
  • Spray drying of nanopowders to form dense microgranules (average size ~40 microns).
  • Plasma treatment of microgranules to achieve spherical micropowders (average size ~20 microns).

Main Results:

  • Successfully synthesized W-C-Co nanopowders with uniform W, Co, and C distribution.
  • Produced dense, spherical W-C-Co micropowders (~20 microns) with a submicron/nanoscale internal structure.
  • Established the influence of plasma treatment parameters on powder dispersity, phase composition, chemical composition, and microstructure.

Conclusions:

  • The study confirms the possibility of obtaining W-C-Co composite micropowders with desired spherical shape and internal nanoscale structure.
  • The developed method yields dense spherical particles without internal cavities.
  • Optimized plasma treatment is key to controlling the properties of the final W-C-Co micropowders.