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Experimental study of the influence of different carbon content on the shrinkage kinetics and structure evolution of ultralow-cobalt hard alloys during spark plasma sintering
- Source :
- IOP Conference Series: Materials Science and Engineering. 1008:012049
- Publication Year :
- 2020
- Publisher :
- IOP Publishing, 2020.
-
Abstract
- The features of the compaction of plasma-chemical WC - (0.3; 0.6; 1) %Co nanopowders with the addition of 0.3 and 0.5% graphite during high-speed spark plasma sintering have been investigated. It was shown that an increased concentration of oxygen adsorbed on the surface of plasma-chemical nanoparticles during mixing with graphite, as well as the effect of graphite itself, which leads to a decrease in the activation energy of sintering due to a decrease in the intensity of the formation of particles of the η-phase in the “oxidized” WC-Co nanopowders, are the main structure features of ultralow-cobalt hard alloys. Samples of finegrained ultralow-cobalt hard alloys with increased hardness and fracture toughness were obtained (for a WC-0.6% Co-0.3% C hard alloy with an average grain size of ∼ 1-1.5 pm, the hardness is Hv = 20.2-20.5 GPa with a minimum crack resistance coefficient K ic = 9.2-10.4 MPa-m1/2).
Details
- ISSN :
- 1757899X and 17578981
- Volume :
- 1008
- Database :
- OpenAIRE
- Journal :
- IOP Conference Series: Materials Science and Engineering
- Accession number :
- edsair.doi...........330239311c3cd3852a99baf56a9ac0b2