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Investigation of binderless WC-TiC-Cr3C2 hard materials prepared by spark plasma sintering (SPS)

Untersuchungen von FAST/SPS gesinterten, binderlosen WC-TiC-Cr3C2 Materialien
: Qiao, Z.; Räthel, J.; Berger, L.-M.; Herrmann, M.


International journal of refractory metals and hard materials 38 (2013), pp.7-14
ISSN: 0263-4368
Journal Article
Fraunhofer IKTS ()
Fraunhofer IWS ()
binderless cemented carbide; FAST densification; mechanical property; microstructure; spark plasma sintering; field assisted sintering technology; tungsten carbide; titanium carbide; chromium carbide; sintering; hardness

Binderless TiC-WC-Cr3C2 hard materials with different compositions were prepared by FAST (field-assisted sintering technique) and by SPS from mixtures of TiC, WC and Cr3C2. The effect of the microstructure on the properties was evaluated in as-densified materials and materials heat treated at 1900 °C. The mechanical properties were determined and the microstructures were characterised using X-ray diffraction and scanning electron microscopy. A cubic (Ti, W, Cr)C phase was found to form during sintering. Hardness values of up to 23 GPa were observed. For the TiC-rich materials annealing did not have a significant effect on the hardness, but in the case of the WC-rich materials it resulted in a reduction in the hardness due to pore formation.