Exploring new approaches and applications for multi-scale porous UHTCS
September 17-20, 2017
The control of processing conditions is key to achieve the desire amount, size and shape of porosity in materials for any application, including extreme applications. However, when particles with irregular shape, large size or differences in surface chemistry are to be used, as it happens for UHTCs, finding the right processing technique becomes crucial to ensure the desired properties, especially when there is not information about the actual performance in the application.
This work describes how these challenges were overcome to develop multi-scale porous UHTCs for high temperature insulation as a case study. The exhaustive control of interparticle forces and understanding interaction between additives and powder surfaces resulted in multi-scale highly porous ceramics using different processing routes (replica, sacrificial fillers, particle stabilized foams plus gelcasting, ice templating and partial sintering, (Figure 1)). These colloidal techniques can render the required thermal conductivity across the component with a combination of different tailored porosities. Additionally, large complex-shape components with the same customized porous microstructure were prepared.
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Carolina Tallon, David Hicks, Clara Minas, Laura Jukes, and George V. Franks, "Exploring new approaches and applications for multi-scale porous UHTCS" in "Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV", Jon Binner, The University of Birmingham, Edgbaston, United Kingdom Bill Lee, Imperial College, London, United Kingdom Eds, ECI Symposium Series, (2017). http://dc.engconfintl.org/uhtc_iv/15