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1.
Emission mechanism of Mo-Y_2O_3 cathode   总被引:6,自引:3,他引:3  
1 INTRODUCTIONMo Y2 O3isanewkindofrareearth molybde numthermioniccathodematerials[1].ItisexpectedtosubstituteradioactiveW ThO2 cathodematerialsinthefuture .Sincethemiddleof 1 970s,peoplehavemainlydoneresearchononekindofrareearth molyb denumcathode—Mo La2 O3cathode[…  相似文献   

2.
1 IntroductionAlkalineearthsulfidehavebeenfoundtobetheexcellentvertatilehostmaterialsfortheapplicationsofthecathodo ,pho to ,thermo andelectro luminescentphos phors[1].However ,ingeneral ,theywerepreparedbymeansoftheconventionalhightemperaturesolidstatereacti…  相似文献   

3.
Effect of La_2O_3 nanoparticles on properties of molybdenum powder   总被引:1,自引:0,他引:1  
1 INTRODUCTIONAsoneofthealternativesofThO2 Wcathode ,La2 O3 Mothermioniccathode (La Mo)appearedinrecent 30 years[1~ 4 ] .Althoughthiscathodehasgoodemissivity ,ithasnotbeenusedcommerciallybecauseofitspooremissionstability[5~ 8] .Themicrostructurestudyonthiscathodesho…  相似文献   

4.
1 INTRODUCTIONThereliabilityofsolderjointsisoneofthecriti calissuesinSurfaceMountTechnology (SMT )field[1~ 3 ] .Themoresevereserviceenvironmentalconditionsofelectronicdevicesinautomotiveapplica tion ,andthedevelopmentofadvancedinterconnec tiontechnologiesfora…  相似文献   

5.
XrayPowderDifractionDataandStructuralParametersforCompoundNdFe0.6Sb2ZengLingmin,QinWenandWuShiwei(曾令民)(覃文)(吴世伟)InstituteofMa...  相似文献   

6.
1.IntroductionSisoneofthemostdeleteriousimpuritiesinsteelsbecauseitcausesintergranularfailure(IGF)notonlyatlowtemperaturesbutalsoatelevatedtemperatures.ThedeleteriouseffectofSisgenerallyinhibitedbyadditionofMnwhichprecipitateSasMnS.Indeed,additionof…  相似文献   

7.
EnthalpyofReactionsinY-Ba-Cu-OSystemShaWei沙维(Departmentof.MaterialsScienceandMetallurgy,UniversityofCambridge.U.K.)Received17...  相似文献   

8.
TheTransactionsofNonferrousMetalsSocietyofChina(hereafterTrans .NonferrousMet.Soc .China) ,foundedin 1991andsponsoredbyTheNonferrousMetalsSocietyofChina ,ispublishedbimonthlyandmainlycontainsreportsoforiginalresearchwhichreflectthenewprogressesinthefieldofno…  相似文献   

9.
INFORMATIONFOROVERSEASCONTRIBUTORSTheTransactionsofNonferousMetalsSocietyofChina(hereafterTrans.NonferrousMet.Soc.China),foun...  相似文献   

10.
《中国有色金属学报》和《TransactionsofNon ferrousMetalsSocietyofChina》是中国科学技术协会主管、中国有色金属学会主办的 2种学术性期刊 ,双月刊 ,国内外公开发行。本刊被SCIE、EI、CA、MR、РЖ、SA等国际性文  相似文献   

11.
《中国有色金属学报》和《TransactionsofNon ferrousMetalsSocietyofChina》是中国科学技术协会主管、中国有色金属学会主办的 2种学术性期刊 ,双月刊 ,国内外公开发行。本刊被SCIE、EI、CA、MR、РЖ、SA等国际性文  相似文献   

12.
1 INTRODUCTIONSelf propagatinghigh temperaturesynthesis(SHS)orcombustionsynthesis ,wasdevelopedbyMezhanovetalinthe 196 0’s .Comparedtotradition almethods,itsadvantagesincludehigh purityofproducts ,lowenergyrequirement ,rapidreactionandsimplicityofprocess[1] .Beca…  相似文献   

13.
ScanningElectronMicroscopyStudiesofYBa_2Cu_3O_(7-δ)SuperconductorsShaWei(沙维)(DepartmentofCivilEngineering,TheQueen′sUniversit...  相似文献   

14.
RoastReactionKineticsofBastnasiteConcentratewithSodiumCarbonateMixtureLiuZhaogang(柳召刚)BaotouResearchInstituteofRareEarth,Baot...  相似文献   

15.
1 INTRODUCTIONThroughoutthecastingoperation ,moldfillingplaysaveryimportantroleincastingqualitycontrol.Manyofthecastingdefectscanberelatedtothefluidflowphenomenainvolvedinthisstageoftheopera tion .Ithasbeennotedthatthepropergatingdesigniscrucialtoachiev…  相似文献   

16.
1.IntroductionMultiwalledcarbonnanotubes(MWNTs)werefoundbyoneofthepresentauthors(S.Iijima)〔1〕insidethecathodedeposits,whichwereobtainedbyanotherauthor(Y.Ando)〔1,2,3〕asbyproductsoffullereneproductionusingaDCarcdischargeevaporationininertgas.TheMWNTsc…  相似文献   

17.
EditorialCommitteeofTransactionsoftheNonferrousMetalsSocietyofChina¥//Chairman:HeBoquanProfessorVice-Chairman:ChenJiayongRese...  相似文献   

18.
1-IntroductionSinceDupiusetal[1,2]showedthatmetalorganicvaporphaseepitaxy(MOVPE)couldbeusedforthefabricationoflasersandsolarcells,MOVPEhasdevelopedintoamaturetechniqueforthegrowthofawidevarietyofsemiconductordevicematerials[3].Oneoftheadvantagesofth…  相似文献   

19.
EditorialCommitteeofthe《TransactionsofNonferrousMetalsSocietyofChina》Chairman:He,BoquanProfessorVice-Chairman:Chen,JiayongRes...  相似文献   

20.
1 IntroductionChemicalreactionamongmetalsandmetalswithceramicsunderhigh energymechanicalmilling (MM)havebeenwide lystudied[1~ 3] .Untilnow ,solidreactionsbetweenmetaloxidesunderMMhavebeenhardlystudied .ZnFe2 O4isakindofspinelferrite ,whichisgenerallysynthe sized…  相似文献   

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