Abstract
Cold sintering is a chemo-mechanical densification process which allows densification of ceramics at low temperatures below 300 °C. This substantial reduction in the sintering temperature is enabled by an externally applied pressure and a compatible transient liquid phase. In this paper, ZnO is cold sintered using various commercial organic acids: formic, acetic and citric acid. The effect of these different transient phases on densification, microstructural evolution and mechanical response is investigated. Fourier transform infrared spectroscopy, thermogravimetric analyses and transmission electron microscopy were conducted to explain the chemical interactions in the cold sintering process. High relative densities (∼ 96 %) were achieved by formic and acetic acid, whereas poor densification was obtained for citric acid (< 80 %), despite the higher expected solubility of zinc oxide. The higher biaxial strength found in samples sintered with formic acid compared to acetic acid (i.e. ∼90 MPa vs. ∼40 MPa) is discussed supported by fractographic analyses.
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 1531-1541 |
| Seitenumfang | 11 |
| Fachzeitschrift | Journal of the European Ceramic Society |
| Jahrgang | 43.2023 |
| Ausgabenummer | 4 |
| DOIs | |
| Publikationsstatus | Veröffentlicht - 2023 |
Bibliographische Notiz
Funding Information:Funding for this research was provided by the European Research Council (ERC) excellent science grant “CERATEXT” through the Horizon 2020 program under contract 817615. Abdullah Jabr acknowledges the Austrian Marshall Plan Foundation for the financial support during his stay at Penn State university. All authors would like to thank the Material Research Institute and its Materials Characterization Laboratory and the staff for help in the state-of-the-art experimental facilities used in this study. Julian Fanghanel is grateful for partial support from the NSF DMR-1729634. Clive Randall would like to thank NSF_FMSG (2134643) and AFOSR (FA 9550-19-1 0372) for partial support of this work and for supporting experimental costs of the work for all students and postdoctoral researchers.
Funding Information:
Funding for this research was provided by the European Research Council (ERC) excellent science grant “CERATEXT” through the Horizon 2020 program under contract 817615 . Abdullah Jabr acknowledges the Austrian Marshall Plan Foundation for the financial support during his stay at Penn State university. All authors would like to thank the Material Research Institute and its Materials Characterization Laboratory and the staff for help in the state-of-the-art experimental facilities used in this study. Julian Fanghanel is grateful for partial support from the NSF DMR-1729634 . Clive Randall would like to thank NSF_FMSG ( 2134643 ) and AFOSR ( FA 9550-19-1 0372 ) for partial support of this work and for supporting experimental costs of the work for all students and postdoctoral researchers.
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