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Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

“…The relative density, porosity and WC average grain size of the mixtures fabricated by SPS, HIP and vacuum are shown in Table 2 However, density values obtained by the SPS technique are much higher than those 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 8 observed in the literature [15,33,34]. This is probably due to smaller particle size and increased pressure used during sintering process.…”

Modification of thermally sprayed cemented carbide layer by friction stir processing

“…The improvement of the mechanical properties of the cemented carbide has been studied by the decrease in the grain size of the WC particles [5]. For example, the spark plasma sintered WC-Co with the WC particles of 100 nm and the hot pressed WC-Co with the WC particles of 169 nm had values of 1887 and 2084 HV, respectively [6,7]. On the other hand, there was no effective process to refine the microstructure of the metallic binder in the cemented carbide.…”

Orientation relationship in WC-Co composite nanoparticles synthesized by in situ reactions

“…At present, the preparation of nanocrystalline WC-Co cemented carbide bulk materials is still challenging; the effects of the characteristics of the initial powders on the microstructure and mechanical properties of the sintered cemented carbide bulks have not been clearly understood yet. Several methods have been developed to synthesize the nanostructured WC or WC-Co composite powders, including the spraying conversion process [11,12], plasma-enhanced chemical vapor deposition [13,14], displacement reaction [15], mechanochemical synthesis [16] and high energy ball milling [17]. In the previous investigations, though the WC-Co or WC powder particles were synthesized successfully, only a few studies obtained the nanoscale particles [12,17].…”