Microstructure of WC in WC–Co cemented carbides consolidated by electric discharge

Abstract

The microstructure of WC in WC-Co cemented carbides fabricated by electric discharge compaction was investigated. A high density of defect, such as stacking faults, was found in WC grains, and lattice distortion also occurred. It indicated that the high strain rate and instantaneous stress induced the formation of defect during densification.

Microstructure of the cBN/WC6Co composite produced by the pulse plasma sintering (PPS) method

“…Zhang et al [15] report that TiC grains, 1 μm in size, heated by electric pulses with a density of 4.1 · 10 6 A/cm 2 were refined to about 14 nm. Wu et al [16] observed that in WCCo sinters heated by the electric discharge compaction (EDC) method the WC grains were strongly defected. In our earlier work [11] the WC grains in the cemented carbides sintered from a WC powder (grain size 60 nm) using electric pulses with a density of 10 6 A/cm 2 were refined to about 30 nm.…”

“…It is known [15][16][17][18][19] that a material heated by high current density pulses becomes strongly defected and refined. Zhang et al [15] report that TiC grains, 1 μm in size, heated by electric pulses with a density of 4.1 · 10 6 A/cm 2 were refined to about 14 nm.…”

Optimization of Spark Plasma Sintering Technology by Taguchi Method in the Production of a Wide Range of Materials: Review

“…The SPS method is used for sintering powder materials. It belongs to a broader group of current-activated methods—PECS (Pulsed Electric Current Sintering) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. This method is used for sintering various advanced composite materials (particle-reinforced, fiber-reinforced), ceramic materials (cermets, oxide and non-oxide ceramics, superhard materials), biomaterials and FGMs [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ].…”

Promotion mechanism of electric current on SiCp/Al composite material deformation

“…In order to surmount the disadvantage of low efficiency with high energy costing during traditional hot forming process, the resistance heating [5][6][7][8] is adopted in SiC p /Al composite material forming process. At present, the current assisted forming has drawn more and more researchers' attention 9,10 . In the meantime, the electric current is shown to influence on plastic property of metal.…”