Enhancing the microstructure of DC flash-sintered high-purity Al2O3 ceramics by stepwise increase in current density
Source abstract
Abstract
A refined control scheme for the current density was implemented to optimize the microstructure of DC flash-sintered high-purity Al 2 O 3 ceramic discs. Compared with conventional DC flash-sintering, which induced a pronounced microstructural gradient along the electric field direction, the introduction of a stepwise increase in current density resulted in higher relative density, finer grains, more uniform microstructure, and increased hardness. The improved homogeneity in the microstructure led to consistent hardness across both sides of the flash-sintered discs. These findings demonstrate that refined control of the current density holds significant potential for tailoring the microstructure and mechanical properties of DC flash-sintered Al 2 O 3 ceramics.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (42)
Show source-provided references
1. Flash sintering of ceramics10.1016/j.jeurceramsoc.2018.08.048 ↗
2. Flash sintering of nanograin zirconia in <5 s at 850 °C10.1111/j.1551-2916.2010.04089.x ↗
3. Recent advances in mechanism research and methods for electric-field-assisted sintering of ceramics
4. Research progress on the flash sintering mechanism and application of oxide ceramics10.15541/jim20210513 ↗
5. A thermal perspective of flash sintering: the effect of AC current ramp rate on microstructure evolution10.1016/j.jeurceramsoc.2020.11.040 ↗
6. Flash-sintering of cubic yttria-stabilized zirconia at 750 °C for possible use in SOFC manufacturing10.1111/j.1551-2916.2010.04267.x ↗
7. Flash sintering of ZnO ceramics with combined power supplies at room temperature10.1016/j.ceramint.2024.02.132 ↗
8. Tailoring the microstructure by a proper electric current control in FS: the case of barium titanate10.1016/j.jeurceramsoc.2022.05.053 ↗
9. Flash sintering of metal-like ceramics: a short overview10.1016/j.ceramint.2024.05.018 ↗
10. Flash sintering of dense alumina ceramic discs with high hardness10.1016/j.jeurceramsoc.2021.09.061 ↗
11. Flash sintering of AlN ceramics with Y2O3 additive10.1016/j.ceramint.2024.10.353 ↗
12. Flash sintering scaling-up challenges: influence of the sample size on the microstructure and onset temperature of the flash event10.1016/j.scriptamat.2020.04.022 ↗
13. Improvements in flash sintering for practical application10.2320/matertrans.MT-Y2023003 ↗
14. Asymmetric temperature distribution during steady stage of flash sintering dense zirconia10.1016/j.jeurceramsoc.2018.02.012 ↗
15. Temperature distributions during flash sintering of 8% yttria‐stabilized zirconia10.1111/jace.13786 ↗
16. Measurement and modelling of electrical resistivity by four-terminal method during flash sintering of 3YSZ10.2109/jcersj2.17256 ↗
17. Influence of forming methods on the microstructure of 3YSZ flash-sintered ceramics10.1016/j.mtla.2022.101419 ↗
18. Enhancing uniformity in flash sintering through high-frequency alternating current-role of skin effect
19. Development of a processing map for safe flash sintering of gadolinium-doped ceria10.1111/jace.17847 ↗
20. Development of instrumented and automated flash sintering setup for enhanced process monitoring and parameter control10.1016/j.jeurceramsoc.2018.09.002 ↗
21. Grain growth kinetics of 3 mol.% yttria-stabilized zirconia during flash sintering10.1016/j.jeurceramsoc.2018.11.032 ↗
22. Surface temperature distribution on dense 8YSZ ceramics during the steady stage in AC flash sintering10.1016/j.ceramint.2020.09.021 ↗
23. Tetragonal phase stabilization and densification in AC flash-sintered 1.5 mol% yttria-stabilized zirconia polycrystals with high toughness10.1016/j.jeurceramsoc.2023.09.010 ↗
24. Microstructure and defect gradients in DC and AC flash sintered ZnO10.1016/j.ceramint.2021.07.018 ↗
25. Effects of electric field on microstructure evolution and defect formation in flash-sintered TiO210.1016/j.jeurceramsoc.2022.06.009 ↗
26. Microstructure and hardness of two-step reverse-polarity flash sintered high-purity Al2O3 ceramics
27. Estimating joule heating and ionic conductivity during flash sintering of 8YSZ10.1016/j.jeurceramsoc.2015.10.037 ↗
28. Current-induced abnormal and oriented grain growth in corundum upon flash sintering10.1016/j.scriptamat.2018.03.004 ↗
29. Flash sintering using controlled current ramp10.1016/j.jeurceramsoc.2018.04.003 ↗
30. Development of an instrumented and automated flash sintering setup for enhanced process monitoring and parameter control10.1016/j.jeurceramsoc.2018.09.002 ↗
31. Flash sintering of ultra-high pure alumina ceramics with fine microstructure10.1111/jace.18554 ↗
32. Flash sintering of Al2O3–ZrO2 ceramics under alternating current electric field10.1016/j.ceramint.2022.08.239 ↗
33. Thermal runaway, flash sintering and asymmetrical microstructural development of ZnO and ZnO-Bi2O3 under direct currents10.1016/j.actamat.2015.04.018 ↗
34. Micromechanical properties and microstructures of AC and DC flash-sintered alumina
35. Effects of limiting current density and current step rate on microstructure and hardness of flash sintered MgAl2O4 ceramics10.1016/j.jeurceramsoc.2024.116982 ↗
36. Joule heating during flash-sintering10.1016/j.jeurceramsoc.2012.02.030 ↗
37. Current-ramp assisted sintering of 3YSZ: electrochemical and microstructural comparison to flash and thermal sintering10.1016/j.jeurceramsoc.2019.09.036 ↗
38. Current-rate flash sintering of gadolinium doped ceria: microstructure and defect generation10.1016/j.actamat.2020.02.036 ↗
39. Effects of firings in hydrogen on the insulation performances of a 95 wt% alumina ceramic10.1016/j.ceramint.2024.04.122 ↗
40. Oxygen vacancy diffusion in alumina: new atomistic simulation methods applied to an old problem10.1016/j.actamat.2009.06.061 ↗
41. Flash sintering of alumina: effect of different operating conditions on densification10.1016/j.jeurceramsoc.2016.03.021 ↗
42. Electrical-field induced nonlinear conductive behavior in dense zirconia ceramic10.1016/j.jmst.2017.03.005 ↗