Enabling the next generation of near-net-shaping techniques for UHTCs
September 17-20, 2017
Hypersonics and other extreme applications rely on components that often require a complex geometry and a fully dense, fine-grained and controlled microstructure. The current state-of-the-art processing of these materials allow their full densification and fine-grained microstructures, but the shaping capability remains a challenge. Near-Net-Shaping Techniques involving the colloidal processing of UHTC powders can afford to render near-net-shaped pieces, but because of the shape, the sintering needs to be done using pressureless conditions. This work will discuss, using zirconium diboride (ZrB2) as a case study, the strategies to enhance the pressureless densification of these materials: i) particle packing in the green bodies (by the control of the interparticle forces in suspension), ii) sintering profiles and iii) incorporation of sintering aids, and how these results compare with the current state-of-the-art processing (hot-pressing).
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Carolina Tallon, GV Franks, and S Leo, "Enabling the next generation of near-net-shaping techniques for 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/55