Author:
Di Maso A.,Savino R.,De Stefano Fumo M.,Silvestroni L.,Sciti D.
Abstract
Arc-jet experiments in high enthalpy hypersonic (Mach 3) non equilibrium flow were carried out on a HfB2
composite with addition of 15 vol% TaSi2, at temperatures exceeding 2000 K. The aerothermal behaviour was tested
considering models having two different geometries, i.e. hemispheric and cone-shaped. The surface temperature and
emissivity of the material were evaluated during the tests. Numerical computations of the nozzle flow were carried out in
order to identify the flow conditions around the model and to analyze the details of thermal heating. The chemicalphysical
modifications were analysed after exposures. The surface emissivity changed from 0.85 to 0.5 due to surface
oxidation. The maximum temperatures reached on the tip were strongly dependent on the sample geometry, being around
2300 K for the hemisphere and 2800 K for the cone. Post test SEM analyses confirmed an excellent stability for this
HfB2-based material.
Publisher
Bentham Science Publishers Ltd.
Cited by
6 articles.
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