Study of High-Speed Sintering of Fine-Grained Hard Alloys Based on Tungsten Carbide with Ultralow Cobalt Content: II. Hard Alloys WC–(0.3–1) wt % Co.

Autor: Lantsev, E. A., Malekhonova, N. V., Chuvil'deev, V. N., Nokhrin, A. V., Tsvetkov, Yu. V., Blagoveshchenskiy, Yu. V., Boldin, M. S., Andreev, P. V., Smetanina, K. E., Isaeva, N. V.
Zdroj: Inorganic Materials: Applied Research; Jun2023, Vol. 14 Issue 3, p677-690, 14p
Abstrakt: 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 creep of γ phase 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 intense 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). [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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