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- W120928672 abstract "Simulations tests under atmospheric re-entry conditions are necessary to select new generation of thermal protection material for space vehicles. High temperature and low-pressure air plasma are of crucial importance to reproduce earth entry phase for spacecrafts. The MESOX set-up, that main parts are the solar radiation concentrator and the microwave-induced plasma, is an appropriate device for experiments in extreme environment. Furthermore, microwave lowpressure plasmas are very efficient sources for exciting species and high electron density production. Hence such non-equilibrium plasma together with the high temperatures and low pressures undergone by space vehicles as they get in contact with the dense layers of the atmosphere are well reproduced by the MESOX setup. New ceramic materials are necessary for the design of primary heat shields for future reusable space vehicles. The main part of the heat flux transferred to the thermal protection system of the space vehicle during the reentry phase is due to the catalytic heterogeneous recombination of oxygen atoms that is an exothermic reaction. This paper deals with some experimental results for the recombination efficiency ! of oxygen atoms reaction and its corresponding accommodation coefficient ∀ on alumina surfaces using a multi-scale approach. Optical Emission Spectroscopy and calorimetry techniques are used to determine respectively the relative concentration profile of oxygen atoms and the heat flux transferred onto the surface. Experimental results of the recombination coefficient ! are presented for three kind of polycrystalline alumina in the temperature range 8002400 K at 200 Pa total pressure of air (subsonic flow). The three samples differ essentially from their impurities (sintering additives). The evolution of the chemical energy accommodation coefficient ∀ is also given for two types of alumina in the temperature range 970-1800 K. AFM and ESEM images are performed to study the surface topography and morphology of the alumina samples, XRD and XPS analyses are also performed on tested samples to know the crystallographic structure and the chemical environments on the surface of the material." @default.
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- W120928672 date "2006-08-01" @default.
- W120928672 modified "2023-09-27" @default.
- W120928672 title "ROLE OF SURFACE IMPURITIES IN ALUMINA SAMPLES ON THE RECOMBINATION OF OXYGEN ATOMS AT HIGH TEMPERATURE" @default.
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