简介：Anexperimentalmethodispresentedtoanalyzethedynamicstabilityofthegasbearingforsmallcryogenicturbo-expanders.Therotationimbalanceresponseandtheshapeoftherotororbitwereobtainedfordifferentspeedsupto110,000rpm,andthecriticalspeedoftherotor-bearingsystemwasdeterminedbyaBodediagram.AnFFTsignalanalyticalmethodwasappliedtoidentifytheresonancefrequency,andthewaterfallplotwaspresented.Duringthewholeprocessofspeedinguptothedesignedspeedof110,000rpm,therotor-bearingworksstablywithnowhirlinstability,whichisvalidatedinawaterfallplot.Also,thetestedrotor-bearingmodelwasanalyzedtheoretically.Itwasprovedthattheexperimentalresultswerehighlyconsistentwiththoseoftheoreticalcalculations.Thustheexperimentalmethodproposedheretoanalyzethedynamicstabilityofthegasbearingisfeasible.

简介：Ahighlyreliableinterfaceofself-alignedbarrierCuSiNthinlayerbetweentheCufilmandthenano-porousSiC:H(p-SiC:H)cappingbarrier(k=3.3)hasbeendevelopedinthepresentwork.Withtheintroductionofself-alignedbarrier(SAB)CuSiNbetweenaCufilmandap-SiC:Hcappingbarrier,theinterfacialthermalstabilityandtheadhesionoftheCu/p-SiC:Hfilmareconsiderablyenhanced.AsignificantimprovementofadhesionstrengthandthermalstabilityofCu/p-SiC:H/SiOC:Hfilmstackhasbeenachievedbyoptimizingthepre-cleanstepbeforecap-layerdepositionandbyformingtheCuSiN-likephase.ThiscaplayeronthesurfaceoftheCucanprovideamorecohesiveinterfaceandeffectivelysuppressCuatommigrationaswell.