A group of Scientists from The National University of Science and Technology MISIS (NUST) Center for constructional Ceramic Material developed a highest melting ceramic material among known compound. It has Unique combination of physical, mechanical and thermal properties the material can be used in heat loaded components of aircraft. The results are published in Ceramic international.
Many leading space agencies (Nasa, ESA, India etc..)are developing reusable space planes. it will reduce the cost delivering people and cargo to orbit and also to reduce the time interval to the flight.
"Currently, significant result have been achieved in the development of such devices. For example, reducing the rounding radius of the sharp front edge of the wings to a few centimeters leads to significant increase in lift and maneuverability, as well as reducing aerodynamic drag. However, when exiting the atmosphere and reentering it, on the surface of the wings of the space plane, temperature of about 2000 degrees C can be observed, reaching 4000 degree C at the very edge. Therefore, when it comes to such aircraft, there is a question associated with the creation and development of new material that can work at such high temperature," says Dmitry Moskovskikh, head of NUST MISIS center for constructional Ceramic Material.
The goal of the scientists was to develop a material with the highest melting point and high mechanical properties, The triple hafnium-carbon-nitrogen system, hafnium carbonitride (Hf-C-N) was chosen, as scientist from Brown University (U.S.) previously predicted that hafnium carbonitride would have high a high thermal conductivity, as resistance to oxidation, as well as the highest melting point in the well known components( approx 4200 degree C).
Using the method of self propagating high-temperature synthesis, the NUSTMISIS scientists obtained hafnium carbonitride close to the theoretical components, with high hardness of 21.3 GPa. At this time the specific melting point of the material is 4000 degree c.
for more information: V.S.Buinevich, A.S. Mukasyan Fabrication of ultra high temperature nonstoichiometric hafnium carbonitridevia combustion synthesis and spark plasma sintering, ceramic international https://doi.org/10.1016/j.ceramint.2020.03.158
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