Ultra high temperature ceramics for applications in extreme environments (Comunicazione a convegno)

Type
Label
  • Ultra high temperature ceramics for applications in extreme environments (Comunicazione a convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Monteverde F.; Savino R.; De Stefano Fumo M.; Di Maso D. (2009)
    Ultra high temperature ceramics for applications in extreme environments
    in 33th International conference and exposition on advanced ceramics and composites, Daytona Beach (FL, USA)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Monteverde F.; Savino R.; De Stefano Fumo M.; Di Maso D. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: 33rd ICACC - 33th International conference and exposition on advanced ceramics and composites (Daytona Beach (FL, USA), 18-23 january 2009). (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • The need of hypersonic vehicles with the capability to fly at speeds from Mach 6 to Mach 20 (or even higher) is driving the development of new materials capable of surviving for finite lifetimes at temperature from 1600°C to 3000°C. Ultra-high temperature ceramics (UHTCs) are been developed for these applications. ZrB2-SiC ceramic composites currently represent the most studied eligible candidates as thermal protection structures (TPS) for hypersonic aircrafts, such as re-entry vehicles or trans-atmospheric airplanes. The extreme environmental conditions of the proposed applications are difficult to reproduce in a laboratory. Conventional thermal gravimetric analysis and furnace oxidation studies provide valuable insights into the oxidation mechanisms. However, how realistically UHTCs behave when sustained convective heat fluxes dominate over temperature with significant concentrations of atomic oxygen (as is the case of shock waves in hypersonic flows) is a central question that has not received much attention to date. In the present contribution, a series of tests was performed in an high-enthalpy arc-jet gallery (5-10 kPa stagnation point pressure, 6-10 MJ/kg specific total enthalpies) using ceramic models of different shapes. The diagnostic set-up included pyrometers, IR thermo-camera, thermo-couples, Pitot probes and pressure transducers. Microstructure modifications after arc-jet testing were investigated. In addition, fluid dynamic numerical models were developed to estimate the plasma flow environment and to correlate the experimental results. The experimental results showed good tests quality and repeatability, and a general agreement with Computational Fluid Dynamics (CFD) calculations (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-ISTEC, Faenza, Dipartimento Ingegneria Aerospaziale Università di Napoli Federico II (literal)
Titolo
  • Ultra high temperature ceramics for applications in extreme environments (literal)
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