Enhanced Sintering Kinetics in Aluminum Alloy Powder Consolidated Using DC Electric Fields

Densification behavior of flash sintered boron suboxide

“…Similar phenomena were observed by Raj et al in the flash sintering of ZrO and TiO 2 . If the specimen was below the critical temperature for flash sintering, a higher applied field could provide the required power for Joule heating on the specimen to trigger flash sintering . However, the Joule heating alone could not account for the rapid sintering phenomenon, which concurs with earlier observations by Raj et al…”

“…9,10,21 If the specimen was below the critical temperature for flash sintering, a higher applied field could provide the required power for Joule heating on the specimen to trigger flash sintering. 17,21 However, the Joule heating alone could not account for the rapid sintering phenomenon, which concurs with earlier observations by Raj et al [9][10][11][12] Narayan had proposed a mechanism to explain the flash sintering phenomenon. 20 He proposed the electric field created a high concentration of dislocations along the grain boundaries leading to enhanced electrical conductivity and rapid heating.…”

“…Currently, researchers have been using flash sintering to consolidate a myriad of materials such as metal oxides, non‐oxide ceramics, and metallic materials . Several mechanisms for flash sintering have been proposed .…”

“…10,11 Currently, researchers have been using flash sintering to consolidate a myriad of materials such as metal oxides, 9,[12][13][14] non-oxide ceramics, 15,16 and metallic materials. 17 Several mechanisms for flash sintering have been proposed. [18][19][20] The majority of papers in the literature to date report using very small samples with narrow cross sections on the order of 1 mm, designed to give uniform electric current density, which leads to homogeneous densification.…”

In‐operando synchrotron experiments of flash sintering carried out in current rate mode

“…Flash sintering enables rapid densification of ceramic powder compacts at reduced furnace temperatures of ∼600-1000 • C. 1,2 During flash sintering, the current driven through the sample increases the sample temperature well above that of the surrounding furnace via Joule heating. Many types of materials, including ion conductors (Y 2 O 3 -stabilized ZrO 2 , [3][4][5][6][7][8][9] Li 6.25 Al 0.25 La 3 Zr 2 O 12 10 ), insulators (Mg-doped Al 2 O 3 , 11,12 pure-Y 2 O 3 13 ), semiconductors (TiO 2 , 14,15 SiC, 16 ZnO 17 ), and metals (Al,Mg-alloy 18,19 ), have been densified by flash sintering.…”