TiC Effect on Tungsten Carbide Button Properties (1/2)

TiC has higher melting point, boiling point, hardness and excellent chemical stability so that it can be widely used in tungsten carbide materials. In order to analyze the effect of TiC on tungsten carbide button, we study from the hardness, the density, the bending strength, fracture toughness and other mechanical properties. The experiment shows that with the increase of the addition amount of TiC, relative density of tungsten carbide button is rising. This is due to tungsten carbide button without TiC has some internal pores or defects by the raw material and the problems in the overall process, its relative density is lower; on one hand, TiC added refine the micro-structure of tungsten carbide button, on the other hand, ne-grained TiC particles uniformly distributed in the gap between the WC particles were packed efficiently so that the distribution of the alloy grain structure more uniform and reasonable, and thus increased densification of tungsten carbide buttons.

Viewed from the hardness, TiC has better hardness than WC, so with fine grains having a dispersion strengthening effect of TiC added, the hardness of the material also increased. However, when TiC is increased to a certain amount, the hardness of the tooth carbide ball longer because TiC added increasing amounts of rises, inside the material has been basically compact at this time. For the bending strength, with the increase of TiC addition amount of the bending strength of tooth carbide ball was dropped after the first rise and then fall. This is due to the TiC added after sintering temperature is lower than the carbonization temperature, dissolved in WC TiC slow imbalance occurs alloy, WC in solid solution reduced the amount of binder phase of Co carbide wettability deteriorated.

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