About hydro-/solvothermal sintering: main features, today's recent advances and tomorrow's promises
Graziella Goglio
CNRS, ICMCB, University of Bordeaux
Graziella GOGLIO, 46 years old, develops research activities related to the chemistry of (nano) materials integrating high pressure and / or solid state chemistry approaches. Recruited as a lecturer in 1999 in the group of Professor Gérard Demazeau, she focused her activities on the synthesis of new materials (superhard carbon nitrides, layered oxides for catalysis) by solvothermal or high pressure processes. From 2006, she joined the group "Chemistry of nanomaterials" where she was interested in the effects of dimension and dimensionality in complex oxide nanoparticles. Appointed professor in 2015, she decided to devote her research activities to hydro- or solvothermal sintering as a technique for densification of ceramics and multimaterials at low temperature. She favors a multidisciplinary approach (high-pressure technology, solvothermal processes, surface chemistry, nanomaterials) to deepen the knowledge on the process.
Abstract
The development of new high performance advanced materials faces the challenge of implementing low temperature densification processes to overcome current technological limitations. Therefore, the impressive performances of... [ view full abstract ]
The development of new high performance advanced materials faces the challenge of implementing low temperature densification processes to overcome current technological limitations. Therefore, the impressive performances of processes such as Cold Sintering Process (CSP), Water-assisted Flash Sintering or FAST/SPS, cool-SPS create a tremendous excitement in the ceramists’ community. In this context, the hydro-/solvothermal sintering (HSS), inspired by the natural processes of geological and biological mineralization, has recently emerged as a major opportunity to develop new and/or optimized materials that respond to today's scientific, technological and related socio-economic issues.
Both HSS and CSP are based on dissolution-precipitation mechanism induced by a pressure solution creep as a driving force for the densification. However, they differ from each other due to the balance between thermodynamics and kinetics that strongly influences the predominance of the involved elementary steps. In the thermodynamically controlled HSS, the operating temperature range (<450 °C) is not suitable for appreciable bulk diffusion but is sufficient to enhance strong reactivity at the interfaces due to hydro-/solvothermal conditions. These specific conditions also represent a powerful lever to tune the nature of the precipitated phase.
The objective here is to present opinions and propose future outlook for HSS based on recent advances. The general background and history of HSS will be first highlighted. The experimental apparatus and its specific technological design evolution will be described. All the potentialities of HSS will be presented mainly from the results obtained on silica used as a common theme to study the sintering of amorphous (silica) or metastable (α-quartz) materials, to fabricate 0-3 type functional nanocomposites (manganite–silica). A description of the current understanding of chemical and mechanical-chemical mechanisms necessary for densification will be proposed. Finally, opportunities and challenges to expand the method more generically to other systems will be discussed.
Authors
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Graziella Goglio
(CNRS, ICMCB, University of Bordeaux)
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Arnaud Ndayishimiye
(CNRS, ICMCB, University of Bordeaux)
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Mythili Prakasam
(CNRS, ICMCB, University of Bordeaux)
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Alain Largeteau
(CNRS, ICMCB, University of Bordeaux)
Topic Area
Processing
Session
OS-8B » Symposium B - Innovative Synthesis & Processing (16:10 - Wednesday, 11th July, Aula Louis Roppe)
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