Abstract

Abstract(Ta,W)C bulks were prepared by spark plasma sintering. Densification kinetics and solid‐solution formation kinetics were performed on the powder mixtures using TaC and W powders. The as‐received tungsten powder had a spherical shape and rather coarse size. By using the crushed and as‐received powder, it can be suggested that sintering at 2000°C limits the reaction volume to 3–6 μm and hence allows forming a complete solid‐solution using finer powders. The lattice parameter, hardness, toughness, and strength were investigated as a function of the TaC content. The flexural strength of the (Ta,W)C ceramic bulks was investigated up to 2000°C and it was found that the maximum strength was for the 60 mol.% TaC composition. Strength as a function of the temperature tended to increase up to 1200°C followed by a gradual decrease to 2000°C. When the TaC was reinformed by coarse W spheres, the flexural strength monotonically decreased from 570 MPa at room temperature to 220 MPa at 2000°C.

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