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Microstructure and Properties of Binderless μWC Obtained Using the Electroconsolidation Method.

Edvin Hevorkian1, Waldemar Samociuk1, Miroslaw Rucki2

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Binderless tungsten carbide (WC) consolidated via electroconsolidation shows improved hardness. This advanced material exhibits promising plastic properties for contact stress applications despite lower fracture toughness compared to nanopowder WC.

Keywords:
ceramic matrix compositecompositeselectroconsolidationnanocompositenanopowdersinteringtungsten carbide

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Area of Science:

  • Materials Science
  • Powder Metallurgy
  • Nanotechnology

Background:

  • Binderless tungsten carbide (WC) possesses superior properties but faces consolidation challenges.
  • Applications are limited by difficulties in processing initial WC powders.

Purpose of the Study:

  • Investigate the microstructure and mechanical properties of binderless WC.
  • Compare binderless WC sintered from 100-200 nm powder with WC sintered from 70 nm nanopowder (nWC).

Main Methods:

  • Electroconsolidation technique used for sintering.
  • Microstructural analysis and mechanical property testing (hardness, fracture toughness).

Main Results:

  • Binderless WC (μWC) achieved a hardness of 30.06 ± 0.09 GPa, 14% higher than nWC.
  • μWC exhibited lower fracture toughness (KIC = 6.59 ± 0.46 MPa·m1/2) compared to nWC.
  • Improved microstructure homogeneity in μWC, lacking large agglomerates found in nWC.

Conclusions:

  • Binderless WC demonstrates enhanced hardness and homogeneity.
  • The material shows applicability under contact stress conditions due to favorable plastic properties.
  • Further research can optimize WC processing for enhanced mechanical performance.