Creep of HfB2-based UHTCs up to 2000oC
September 17-20, 2017
Ultra-high temperature ceramics (UHTCs) are promising candidates for hypersonic applications as a consequence of their high melting points, in excess of 3000 ºC for ZrB2 and HfB2 UHTCs. The UHTCs community has traditionally focused on development of more oxidation-resistant UHTC composites as a consequence of poor oxidation resistance of monolithic UHTCs, which has led to the choice of SiC-reinforced MeB2 (where Me is Zr or Hf) as the baseline material for extreme environments. An overview of current understanding of high temperature creep of MeB2–based UHTCs will be described, discussing the following points:
• Poor creep resistance of SiC-reinforced HfB2 and their structural instabilities.
• Plastic behavior of HfB2 which deforms like an hcp-metal.
• Plastic behavior of HfB2/2 wt.% La2O3 or how to maintain the creep resistance while improving the oxidation resistance.
• New approaches to increase the creep resistance of HfB2
Eugenio Zapata-Solvas, Chenchen Liu, Lun Feng, Salvatore Grasso, Mike Reece, Diego Gomez-Garcia, Arturo Dominguez-Rodriguez, See Hun Lee, and Bill Lee, "Creep of HfB2-based UHTCs up to 2000oC" 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/50