Selective laser flash sintering of 8‐YSZ
Abstract
Flash sintering of ceramics is characterized by rapid sintering during simultaneous application of electric field and heat. Previous studies of flash sintering have been conducted in furnace environments, where sample temperatures are approximately uniform. In this work, we use highly dynamic heating from a scanning laser to initiate flash sintering while simultaneously applying a DC electric field. Onset of flash sintering is determined by a measurable increase in current through the sample. Our results show that stage I and stage II flash sintering can be initiated by laser heating. At low‐to‐moderate combinations of laser energies and applied electric fields, measured current rises slightly when the laser is scanned completely across the specimen from the positive to the negative electrodes. Microstructures for these samples show that powder consolidation is minimal in this regime (stage I flash sintering), and thus the observed current is likely due to onset of neck growth between powder particles rather than densification. At higher laser energies and fields, current rises steeply and microstructures show significant consolidation (stage II flash sintering). The demonstration that flash sintering occurs when ceramic is heated by laser‐scanning supports future utilization of selective laser flash sintering as an additive manufacturing process.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 05, 2019
- Source ID
- 10.1111/jace.16771
Entities
People
- Deborah Hagen
- Desiderio Kovar
- Joseph J. Beaman
Organizations
- Office of Naval Research
- University of Texas at Austin