Effects of doping cations on the densification and microstructure of flash-sintered α-Al2O3

Yang, Shoulei; Wei, Pengfei; Pang, Rui; Fan, Lei; Fu, Xinxin; An, Linan

doi:10.1016/j.jeurceramsoc.2022.12.001

Cited by 6 publications

(1 citation statement)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

We report first-time results for in-operando flash sintering synchrotron experiments carried out in current rate mode where the specimen, held at a constant temperature, is fed current that is increased at a constant rate. These experiments are unique because the time dependence of the sintering behavior can be stretched out over a longer period (by changing the current rate) than in voltage-to-current experiments in which sintering occurs in a burst at the onset of the flash. Two results are presented: (i) A comparison of temperatures measured with the platinum standard to those predicted by the black body radiation model leading to estimates of the emissivity as a function of porosity whereby emissivity increases from 0.65 to 0.9 as the sample sinters from its green state to full density, and (ii) measurements of the excess lattice expansion as a function of density as the sample sinters continuously while the current is increased. The present work highlights the promise of current rate experiments to obtain results while the sample sinters gradually from its green density to full density (somewhat akin to conventional sintering) for gaining further insights into the mechanisms of flash sintering.

show abstract