Flash Sintering of Ceramics
E. Koray Akdoğan
Department of Materials Science & Engineering
Rutgers-The State University of New Jersey
Piscataway, New Jersey 08854
Abstract
Sintering refers to processes in which various atomic transport mechanisms are collectively activated for consolidating particulate matter into a dense polycrystalline solid. In the case ceramics, which are low atomic mobility systems as compared to metals, electric field assisted methods of sintering are used. An applied electric field provides the much needed additional thermodynamic driving force for densification because the topological driving forces and the associated thermally activated kinetic processes are limited. Unlike the popular spark plasma sintering (a steady state method), flash sintering is a low energy density and transient state process that enables one to induce precipitous densification within seconds to a few minutes instead of hours at furnace temperatures that are substantially lower than conventional sintering temperatures. In this presentation, the flash sintering behavior of systems such as 8%Y2O3-ZrO2 (an ionic conductor), K(Na,Nb)O3 (a ferroelectric), B4C (a small polaron conductor) and TiB2 (a metallic conductor) will be presented. It will be shown that flash sintering is a universal transient state phenomenon in oxide and nonoxide ceramics the origins of which cannot be solely attributed to Joule heating. Competing hypothesis on the origins of flash sintering will be concisely examined. The importance of powder characteristics and sample shape will also be briefly discussed
About the Speaker
https://mse.rutgers.edu/fac/e-koray-akdo%C4%9Fan
You can also join via zoom:
Topic: MSE Colloquium - E. Koray Akdoğan
Time: Oct 7, 2022 11:00 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://columbiauniversity.zoom.us/j/93101481241?pwd=aElYcWhueERrZkFNQmVybHVDNU8vUT09
Meeting ID: 931 0148 1241
Passcode: 165635
