Abstract
The features of spark plasma sintering (SPS) of plasma-chemical nanopowders WC – (0.3, 0.6, 1) wt.% Co were studied. The SPS process of ultralow-cobalt hard alloys can be sequentially represented as a change of the following stages: rearrangement of particles at lower temperatures (Stage I) → sintering of WC – Co particles due to Coble diffusion creep of cobalt, the intensity of which is determined by the grain boundary diffusion rate (Stage II ) → sintering due to diffusion creep, the rate of which is limited by the bulk diffusion in cobalt (Stage III-1) → sintering of tungsten carbide particles along the intergranular boundaries of WC/WC under conditions of intensive grain growth (Stage III-2). Samples with a high density (96.4 – 98.4 %) and high mechanical properties were obtained (for the WC – 0.3 % Co hard alloy: Hv ~ 20.5 GPa, K1C = 7.1 MPa·m1/2).
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