Particle Surface Softening as Universal Behaviour during Flash Sintering of Oxide Nano-Powders

Particle Surface Softening as Universal Behaviour during Flash Sintering of Oxide Nano-Powders

The dissipated electric power in oxide powder compacts, subjected to flash sintering, is several hundreds of W·cm-3. This power is analyzed considering local softening/melting and transient plasma/liquid formation at the particle contacts due to thermal runaway. The sudden increase in compact electric conductivity and dissipated power referred to current percolation through the softening/liquid...

Sintering of Fine Oxide Powders: II, Sintering Mechanisms

Conventional and new sintering mechanisms have been porous compacts is well-known in the ceramic literature. However, several reports have been presented recently that investigated using fine powders of CeO2 and Y2O3 of excellent sinterability. We have verified the validity of Herring’s show that particle/grain size can remain essentially constant up to a density of 92%, and such a resistance t...

Liquid Film Capillary Mechanism for Densification of Ceramic Powders during Flash Sintering

Recently, local melting of the particle surfaces confirmed the formation of spark and plasma during spark plasma sintering, which explains the rapid densification mechanism via liquid. A model for rapid densification of flash sintered ceramics by liquid film capillary was presented, where liquid film forms by local melting at the particle contacts, due to Joule heating followed by thermal runaw...

Sintering of Zircon Powders

Surface Coating of Oxide Powders: A New Synthesis Method to Process Biomedical Grade Nano-Composites

Composite and nanocomposite ceramics have achieved special interest in recent years when used for biomedical applications. They have demonstrated, in some cases, increased performance, reliability, and stability in vivo, with respect to pure monolithic ceramics. Current research aims at developing new compositions and architectures to further increase their properties. However, the ability to t...