Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 43, Issue 8, Pages 3524-3537Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2023.02.007
Keywords
Flash sintering; Dislocations; Solid-state sintering; Sintering mechanism; Microstructure; Plasticity; Fast firing; High heating rate sintering
Categories
Ask authors/readers for more resources
Flash sintering of SrTiO3 is characterized by high heating rates, resulting in increased dislocation density and plasticity, which facilitates the densification of ceramic powder compacts.
Flash sintering involves very rapid densification of ceramic powder compacts during a thermal runaway induced by an applied voltage and current. The mechanisms of fast densification are still not well-understood. The present study investigates the impact of high heating rates during flash sintering on densification, dislocation density and plasticity of SrTiO3. After flash sintering, a high dislocation density of almost 1014 m- 2 was observed by TEM. Uniaxial compression at 1150 degrees C revealed very high deformation rates. It is argued that for SrTiO3, dislocations are generated and migrate during flash sintering. This becomes possible by the very high heating rates, which conserve high driving forces for sintering up to high temperatures. High driving forces of several 10 MPa are preserved up to high temperatures. Thus, the sintering stress can be above the flow stress of SrTiO3 (5 MPa), and the nucleation of dislocations occurs, paving the path for plastic flow.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available