Pressure effect on the homogeneity of spark plasma-sintered tungsten carbide powder

  • Grasso S
  • Sakka Y
  • Maizza G
 et al. 
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A combined experimental/numerical methodology was devel- oped to aid full densification of pure ultrafine tungsten carbide powder by means of Spark Plasma Sintering (SPS) operating in Current Control mode. Applied pressure ranged from 5 to 80 MPa while the current intensity was set and held constant at 1400 A. The developed SPS model used a moving-mesh tech- nique to account for the electrothermal contact resistance change during both shrinkage and punch sliding follow-up. The pressure dependence on the electrothermal contact resis- tance was also taken into account by the model. The experi- mental and numerical results showed the effects of pressure on grain growth, residual porosity, and hardness observed along the sample radius. Upon increasing sintering pressure, complete densification was obtained by reducing the peak temperature measured at the die surface. By combining experimental and modeling results, a direct correlation between compact micro- structure homogeneity and sintering parameters (i.e., tempera- ture and applied pressure) was established

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  • Salvatore Grasso

  • Yoshio Sakka

  • Giovanni Maizza

  • Chunfeng Hu

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