ACerS-ECerS Joint Symposium - Emerging Ceramic Technologies; Challenges and Future Prospects: Emerging Ceramic Technologies II
Sponsored by: The American Ceramic Society; The European Ceramic Society
Program Organizers: Tatsuki Ohji, National Institute of Advanced Industrial Science and Technology; Jon Binner, University of Birmingham; Martha Mecartney, University of California, Irvine; Anne Leriche, Université Polytechnique Hauts-de-France
Monday 2:00 PM
November 2, 2020
Room: Virtual Meeting Room 14
Location: MS&T Virtual
Session Chair: Anne Leriche, Université Polytechnique Hauts-de-France
2:00 PM Invited
Colloidal Processing as an Effective Tool for Manufacturing Functional Ceramics with Enhanced Properties: Rodrigo Moreno1; 1Institute of Ceramics and Glass, CSIC
Colloidal processing is widely recognized as a powerful approach to produce a broad variety of ceramics and ceramic-based composites for either structural or functional applications. One of the most important features of colloidal processing is its feasibility to design nanostructured materials with tailored microstructures and complex microarchitectures. This can be achieved through a suitable selection of synthesis routes and shaping techniques by optimizing the rheological properties of the suspensions in combination sometimes with fast sintering techniques in order to reach high denisficaties and to preserve the nanostructure. In this talk some examples of the feasibility of colloidal processing in the manufacture of laminates and nanostructured composites are shown, such as the manufacture of multilayer composites designed by combination of ferroelectric and ferromagnetic lead-free phases and the optimization of fuel cell components, emphasizing the direct effect of rheological properties on the mcrostructural features of the sintered materials.
2:30 PM Invited
Transformation-induced Plasticity in Ceria-doped Zirconia Composites: Towards Ductile and Shape-memory Ceramics: Alethea Liens1; Helen Reveron1; Damien Fabrègue1; Jerome Chevalier1; Mike Swain2; 1MATEIS, UMR CNRS 5510, INSA de Lyon, University of Lyon; 2University of Sydney
Ceramics generally fail at low strains with a much larger scatter in the strength values than metals and require statistical approaches to failure. Here we describe in details the mechanical behavior laws of ceria-doped zirconia composites exhibiting a high degree of stress-induced transformation. They present, to some extent, mechanical behavior analogous to a metal, displaying, i) significant amount of transformation-induced plasticity without damage, ii) very high flaw tolerance and iii) almost no dispersion in strength data. Plasticity occurs via the nucleation and growth of transformation bands, which are quite analogue to the features sometimes observed in shape-memory alloys. Moreover, this shape memory effect is also applicable to these ceramics, with a recovery of the plastic strain through thermal treatments. These composites thus potentially open new application avenues in situations where the advantages of ceramics were dampened by their brittle failure behavior.