简介：Electrondensity(Ne)inaglowdischargeplasmaforthesurfacealloyingtechniqueisdiagnosedbyopticalemissionspectrometry(OES).WithCH_4asthefeedinggas,NeisobtainedbycomparingtheHβspectrumaccordingtotheStarkbroadeningeffect.ItisnoticedthatNevarieswiththeworkingpressures(30Pato70Pa)andcathodevoltages(500Vto1000V),respectively.Duetoanabnormalglowdischarge,Neisbetween1.71×10~(15)/cm~3to6.64×10~(15)/cm~3andincreasesrapidlywithworkinggaspressuresandcathodevoltages.TheresultsshowthatOESisausefulmethodtomeasuretheplasmaparametersinasurfacealloyingglowdischargeplasma.

简介：Consideringutilizationoftheoriginalchromium-bronzematerial,twoprocessingtechniquesincludinghydraulicexpansionandhightemperaturevacuumweldingwereproposedfortheoptimizationofheat-sinkstructureinEAST.Theheattransferperformanceofheat-sinkwithorwithoutcoolingtubewascalculatedanddifferenttypesofconnectionbetweentubeandheat-sinkwerecomparedbyconductingaspecialtest.Itisshownfromnumericalanalysisthatthediameterofheat-sinkchannelcanbereducedfrom12mmto10mm.Comparedwiththeoriginalsample,thethermalcontactresistancebetweentubeandheat-sinkforweldingsamplecanreducetheheattransferperformanceby10%,whileby20%forthehydraulicexpansionsample.However,theweldingtechniqueismorecomplicatedandexpensivethanhydraulicexpansiontechnique.Boththeprocessingtechniqueandtheheattransferperformanceofheat-sinkprototypeshouldbefurtherconsideredfortheoptimizationofheat-sinkstructureinEAST.