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1、appliedsurfacescienceELSEVIERAppliedSurfaceScience96-98(J996)272-279Particlessynthesisinerosivelaserplasmainahighpressureatmospherea*··ab(A.G.Gnedovets',E.B.Kul'batskil,I.Smurov,G.Flamant.','Baiko&InsfltweofMetallurgy,RussianAcademyofSciences,LeninskyProspekr49,1179J1Mosco
2、w,RussianFederati(lnbEcoleNationaled'lngenieursdeSaint-Etienne,5&rUt'JeanParot,F-42023Saint-EtienneCedex2,FrancecInstitUIdeScienceetdeGeniedesMaleriauxetPruCI!dhCNRS,BP5,F-66125Font-RomeuCedex,FranceReceived22May1995AbstractSynthesIsofultrafineparticlesasaresultofcondensat
3、ioninanerosiveJetatlaservaporization(Ifmaterials(metals,metaloxides,carbon)ingases(hydrogen,oxygen,helium,argon,xenonandair)athighpressuresisIOvestigated.Thegranulometnc,phase,andchemicalcompositionofthecondensateparticlesisanalyzedinrelationtotheelaborationcondltlOnS,Itis
4、foundthatthemeandimensionsofthecondensateparticlesincreasewithincreasingtheambientgaspre~sure,Aparticlenucleationandgrowththeoryisusedtodescribetheformationofthedispersedcondensateintheerosiveplasma.Itisshownthattheresultingparticlesizedistributionisdeterminedbythecoolingr
5、atedependenceofthevapor-gasmixtureonthepressureofthesurroundinggas.1.IntroductionThispaperconcernswiththesynthesisofultrafineparticlesbasedonthecondensationofvaporsatlaserVariousmethodshavebeendevelopedforproducirradiationofmaterials(metals,metaloxidesandwgultrafinepowders
6、ofmaterialsbymeansofhocarbon)inanatmosphereofgases(hydrogen,oxymogeneousnucleationinthevaporphase.Adetailedgen,helium,argon,xenonandair)athighpressures.surveyoftheexistingtechniques,suchasvaporizationofmaterialinvacuumchamber,magnetronsputFtering,chemicalvapordeposition,la
7、serablation,arc2.Experimentalconditionsandmethodsofanaly."andRFplasmamethods,etc.,canbefoundinRefs.sis[1-4],[orexample.Theseprocessesareconnectedwithsupersaturationinthevapor,whichisusuallyTheexperimentswereconductedinairandinaachievedbycoolingofthevaporduringitsrapid340cm
8、reactionchamberfilledwithgas(hydrogen,expansIOn[5-7]and/orbyinteractionwith"cold"oxygen,h
