Flash sintering of ceramic materials
Top Cited Papers
- 1 October 2016
- journal article
- review article
- Published by IOP Publishing in Materials Research Express
- Vol. 3 (10), 102001
- https://doi.org/10.1088/2053-1591/3/10/102001
Abstract
During flash sintering, ceramic materials can sinter to high density in a matter of seconds while subjected to electric field and elevated temperature. This process, which occurs at lower furnace temperatures and in shorter times than both conventional ceramic sintering and field-assisted methods such as spark plasma sintering, has the potential to radically reduce the power consumption required for the densification of ceramic materials. This paper reviews the experimental work on flash sintering methods carried out to date, and compares the properties of the materials obtained to those produced by conventional sintering. The flash sintering process is described for oxides of zirconium, yttrium, aluminium, tin, zinc, and titanium; silicon and boron carbide, zirconium diboride, materials for solid oxide fuel applications, ferroelectric materials, and composite materials. While experimental observations have been made on a wide range of materials, understanding of the underlying mechanisms responsible for the onset and latter stages of flash sintering is still elusive. Elements of the proposed theories to explain the observed behaviour include extensive Joule heating throughout the material causing thermal runaway, arrested by the current limitation in the power supply, and the formation of defect avalanches which rapidly and dramatically increase the sample conductivity. Undoubtedly, the flash sintering process is affected by the electric field strength, furnace temperature and current density limit, but also by microstructural features such as the presence of second phase particles or dopants and the particle size in the starting material. While further experimental work and modelling is still required to attain a full understanding capable of predicting the success of the flash sintering process in different materials, the technique non-etheless holds great potential for exceptional control of the ceramic sintering process.Keywords
This publication has 100 references indexed in Scilit:
- Mechanical properties of ZrB2- and HfB2-based ultra-high temperature ceramics fabricated by spark plasma sinteringJournal of the European Ceramic Society, 2013
- An experimental setup for shrinkage evaluation during electric field-assisted flash sintering: Application to yttria-stabilized zirconiaJournal of the European Ceramic Society, 2013
- Joule heating during flash-sinteringJournal of the European Ceramic Society, 2012
- Densification and enhancement of the grain boundary conductivity of gadolinium-doped barium cerate by ultra fast flash grain weldingJournal of the European Ceramic Society, 2012
- Enhanced Grain Boundary Mobility in Yttria‐Stabilized Cubic Zirconia under an Electric CurrentJournal of the American Ceramic Society, 2011
- Field assisted and flash sintering of alumina and its relationship to conductivity and MgO-dopingJournal of the European Ceramic Society, 2011
- Surface Diffusion‐Controlled Neck Growth Kinetics in Early Stage Sintering of Zirconia, with and without Applied DC Electrical FieldJournal of the American Ceramic Society, 2010
- A Phenomenological Model on Phase Transitions in Nanocrystalline Barium Titanate CeramicJournal of the American Ceramic Society, 2010
- Influence of an applied dc electric field on the plastic deformation kinetics of oxide ceramicsPhilosophical Magazine, 2010
- On the separation of the contributions of powder particle cores and intergranular contacts to the electric resistivity of the compressed powder materialsMaterials Chemistry, 1982