Relation between microstructure, properties and spark plasma sintering (SPS) parameters of pure ultrafine WC powder |
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| Authors: | Giovanni Maizza Salvatore Grasso Yoshio Sakka Tetsuji Noda Osamu Ohashi |
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| Affiliation: | aDepartment of Materials Science & Chemical Engineering, Politecnico di Torino, Corso Duca Abruzzi 24, I-10129 Turin, Italy;bNational Institute for Materials Science, Ibaraki 305-0047, Japan;cGraduate School of Science & Technology, Niigata University, Niigata 950-2181, Japan |
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| Abstract: | A combined experimental/numerical methodology is developed to fully consolidate pure ultrafine WC powder under a current-control mode. Three applied currents, 1900, 2100 and 2700 A, and a constant pressure of 20 MPa were employed as process conditions. The developed spark plasma sintering (SPS) finite-element model includes a moving-mesh technique to account for the contact resistance change due to sintering shrinkage and punch sliding. The effects of the heating rate on the microstructure and hardness were investigated in detail along the sample radius from both experimental and modeling points of view. The maximum hardness (2700 HV10) was achieved for a current of 1900 A at the core sample, while the maximum densification was achieved for 2100 and 2700 A. A direct relationship between the compact microstructure and both the sintering temperature and the heating rate was established. |
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| Keywords: | Pure WC powder SPS Thermoelectric model Finite element Current-control mode Heating rate Moving mesh Electric contact resistance |
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