Activated sintering of W-HfC composite materials

• Published in: Russian journal of non-ferrous metals Vol. 52; no. 3; pp. 285 - 289
• Main Authors: Vikhman, S. V., Klimova, O. G., Ordan’yan, S. S., Tolochko, O. V., Cheong, D. -I.
• Format: Journal Article
• Language: English
• Published: Heidelberg Allerton Press, Inc 01.06.2011; Springer Nature B.V
• Subjects: Activated sintering; Billets; Ceramic; Chemistry and Materials Science; Composite Materials; Density; Grain size; Hafnium carbide; Materials Science; Metallic Materials; Nonferrous metals; Refractory; Sintering (powder metallurgy); Tungsten; mechanical activation; uniaxial compaction; tungsten; activated sintering; density; porosity; tungsten nanopowders; hafnium carbide
• ISSN: 1067-8212; 1934-970X
• DOI: 10.3103/S1067821211030242

The features of consolidation of the particles during the activated sintering of tungsten powders with different values of dispersity ( d av = 2–3 and 0.8–1.0 μm) are investigated. Sintering was activated by introducing nickel additives (up to 0.5 wt %), tungsten nanoparticles (up to 30 wt %), and finely dispersed hafnium carbide (5–30 vol %) with subsequent milling in a vibrating mill. The uniaxial compaction of the samples has been performed under pressures from 50 to 1000 MPa, and sintering was performed in vacuum at 1850°C with holding for 1 h. It is shown that the additives of tungsten carbide increase the density of sintered billets and, in combination with dispersed hafnium carbide, tungsten-based composite materials with a grain size up to 2 μm can be obtained.