Field Assisted Sintering Technique Compaction of Ultrafine-Grained Binderless WC Hard Metals

• Authors: M. Dopita , A. Salomon , D. Chmelik , B. Reichelt , D. Rafaja
• Languages of publication: EN

Abstracts

EN

Tungsten carbide (WC) powder having a crystallite size around 55 nm and the Brunauer-Emmett-Teller specific surface area 2.75 m^2/g was sintered using the field assisted sintering/spark plasma sintering technique. Sintered samples were investigated using different analytical methods providing detailed information on the microstructure and mechanical properties of materials. Density and porosity of specimens were determined using the Archimedes principle and optical and scanning electron micrographs. The X-ray diffraction investigations provided the information on the crystal real structure and crystallite sizes. The electron backscatter diffraction measurements yielded the details about the grain size, frequency, and distributions of grain boundaries. Finally, the essential mechanical properties of sintered samples were obtained from the hardness and fracture toughness measurements. The influences of individual sintering conditions: sintering temperature and sintering time especially, on the microstructure and mechanical properties of sintered specimens were derived. Fully compact samples having the Vickers hardness HV10 around 29 GPa and fracture toughness K_{Ic} approximately 7.2 MPa m^{1/2} were sintered from temperatures of 1800C and holding times 1 min. Specimens sintered at lower temperatures showed lower density which resulted in a significant drop in the sample hardness.

Keywords

EN

81.05.Je; 81.05.Mh; 81.07.-b; 81.20.-n; 81.20.Ev; 62.20.Qp; 62.20.mm

Discipline

• 62.20.mm: Fracture
• 62.20.Qp: Friction, tribology, and hardness(see also 46.55.+d Tribology and mechanical contacts in continuum mechanics of solids; for materials treatment effects on friction related properties, see 81.40.Pq)
• 81.20.-n: Methods of materials synthesis and materials processing(see also 61.72.U- Doping and impurity implantation; for crystal growth, see 81.10.-h; for film growth, deposition and epitaxy, see 81.15.-z)
• 81.05.Mh: Cermets, ceramic and refractory composites
• 81.07.-b: Nanoscale materials and structures: fabrication and characterization(for structure of nanoscale materials, see 61.46.-w; for nanostructured materials in electrochemistry, see 82.45.Yz; see also 62.23.-c Structural classes of nanoscale systems in mechanical properties of condensed matter)
• 81.05.Je: Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)(for ceramics in electrochemistry, see 82.45.Yz)
• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 639-642

Dates

published

2012-09

Contributors

author

M. Dopita

• Institute of Materials Science, Technical University of Freiberg, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany

author

A. Salomon

• Institute of Materials Science, Technical University of Freiberg, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany

author

D. Chmelik

• Institute of Materials Science, Technical University of Freiberg, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany

author

B. Reichelt

• Institute of Materials Science, Technical University of Freiberg, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany

author

D. Rafaja

• Institute of Materials Science, Technical University of Freiberg, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany

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Identifiers

DOI

10.12693/APhysPolA.122.639