Publication :


Title:

Preliminary tests of silicon carbide based concretes for hybrid rocket nozzles in a solar furnace

Authors: R. D'Elia, G. Bernhart, T. Cutard, G. Peraudeau and M. Balat Pichelin
Year: 2014
Journal: Acta Astronautica.
Volume: 99, Pages: 242-251

DOI: 10.1016/j.actaastro.2014.02.027
Référencé ISI Web Of Science
Référencé Scopus

Abstract:
This researchispartofthePERSEUSproject,aspaceprogramconcerninghybrid propulsion andsupportedbyCNES.Themaingoalofthisstudyistocharacterisesilicon carbidebasedmicro-concretewithamaximumaggregatessizeof800 μm, inahybrid propulsion environment.Thenozzlethroathastoresisttoahighlyoxidisingpolyethylene (PE)/N2O hybridenvironment,undertemperaturesrangingupto2980K. Thestudyisdividedintotwomainparts:thefirstonedealswiththethermo-mechanical characterisationofthematerialupto1500Kandthesecondonewithaninvestigationonthe oxidationbehaviourinastandardatmosphere,underasolarfluxupto13.5MW/m2. Young’s moduluswasdeterminedbyresonantfrequencymethod:resultsshowan increasewiththestabilisationtemperature.Fourpointbendingtestshaveshownarupture tensilestrengthincreasingwithstabilisationtemperature,upto1473K.Sinteringand densification processesareprimarycausesofthisphenomenon.Visco-plasticbehaviour appearsat1373K,duetotheformationofliquidphasesincementternarysystem. High-temperatureoxidationinambientairwascarriedoutatPROMES-CNRSlaboratory, ona2kWsolarfurnace,withaconcentrationfactorof15,000.Amaximum13.5MW/m2 incident solarfluxanda7–90 sexposuretimeshavebeenchosen.Opticalmicroscopy,SEM, EDS analyseswereusedtodeterminethemicrostructureevolutionandthemasslosskinetics. During thesetests,siliconcarbideundergoesactiveoxidationwithproductionofSiOandCO smokesandablation.Alinearrelationbetweenmasslossandtimeisfound.Oxidationtests performed at13.5MW/m2 solar fluxhaveshownamasslossof10mg/cm2 after15s.After 90s,themasslossreaches60mg/cm2. Surface temperaturemeasurementisamainpointinthisstudy,becauseofnecessityofa thermo-mechanical-ablativemodelforthematerial.Smokesappearataround5.9MW/m2, leading totheimpossibilityofusefultemperaturemeasurementsbyopticalpyrometry. Micro-concreteisreallyinterestingforthenozzlerealisation,thankstoitsworkability, and itsthermo-mechanicalproperties.After30s,masslossinmicro-concreteisonehalfof pure α-SiC.ThisresultisreallyinterestingtostudySiC-basedconcretesinoxidising environments,insteadofsintered α-SiC.

Bibtex citation :
@article{D'Elia2014,
Author={D'Elia, R. and Bernhart, G. and Cutard, T. and Peraudeau, G. and Balat Pichelin, M.},
Title={Preliminary tests of silicon carbide based concretes for hybrid rocket nozzles in a solar furnace},
Journal={Acta Astronautica},
Volume={99},
Number={},
Pages={242-251},
Year={2014}}


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