Analysis of Sintering Parameters by SPS on Cemented Carbide

Abstract

The aim is to analyze the influence of two sintering process parameters concerning the compact densification of WC-Co. The input variables studied were uniaxial pressure (40 and 60 MPa) and holding time (1 and 3 minutes). The output variables monitored were relative density, microstructural features, besides online monitoring of dynamics of sintering. The samples were sintered in a Dr. Sinter-Syntex machine of Spark Plasma Sintering (SPS), which allows heating rate greater than conventional sintering techniques, with the advantage of lower temperature, time and energy consumption. The powder used was a compaction residue of grade K (with content between 3 and 12%Co). The results showed significant influence of pressure on the density and percentage of the porous area; however, the process parameters did not affect the grain size.