Scientists develop the most heat-resistant material ever created

Phys.org  May 27, 2020
Using the method of self-propagating high-temperature synthesis, an international team of researchers (Russia, USA – University of Notre Dame) fabricated nonstoichiometric hafnium carbonitrides (HfCxNy). It had a rock-salt crystal structure with a lattice parameter of 0.4606 nm. and hardness of 21.3 GPa. The melting point of this synthesized material was experimentally shown to be higher than that of binary hafnium carbide. The nonstoichiometric hafnium carbonitride was then consolidated under a constant pressure of 50 MPa at a temperature of 2000 °C and a dwelling time of 10 min, through spark plasma sintering. The obtained bulk ceramic material had a theoretical material density of 98%, Vickers hardness of 21.3 GPa, and fracture toughness of 4.7 MPa m1/2. The material is promising for use in the most heat-loaded components of aircraft, such as nose fairings, jet engines and sharp front edges of wings operating at temperatures above 2000 degrees C…read more. TECHNICAL ARTICLE

(a) Schematic and (b) photograph of the setup used for the comparative studies of the ceramics’ melting point Credit: Ceramics International, Volume 46, Issue 10, Part B, July 2020, Pages 16068-16073

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