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1.
缪贵宾 《电焊机》1996,(4):38-39
LGK系列空气等离子切割机的使用与维修天津大学机电工厂(300072)缪贵宾OperationandRepairofLGKSeriesAirPlasmaCuttingMachine¥(TianjinUniversityMachineryandElec...  相似文献   

2.
王忠达 《电焊机》1994,(2):44-45
切割机中的几种点火方法四川新都焊接设备厂(610500)王忠达IgnitionMannersofCuttingMachineSichuanXinduWeldingEquipmentFactoryWangZhongda空气等离子切割机在机械加工中的作用...  相似文献   

3.
1.IntroductionInternalfriction(IF)andultrasonicattenuation(UA)arethedissipationofmechanicalvibratingenergycausedbythereactionofvariousdefectsinmaterialsuponanexternallyappliedalternativestress,whichhavetheadvantageofhighsensitivityandreliabilityinth…  相似文献   

4.
1.IntroductionDevelopmentactivityofcontinuousextrusionprocessleadstotheintroductionofcontinuousextrusioncladdingprocessforthecladdingofsteelwire(ASwire)andthesheathingofsoftcores(fiberopticsandCATV)withaluminum.Thecontinuousextrusioncladdingproces…  相似文献   

5.
1.IntroductionDuringthepastseveraldecadesyears,muchattentionhasbeenfocusedonunderstandingtherelaxationpropertiesandphasetransitionsinstronglycompositionaldisorderedferroelectrics,suchasPb(Mg1/3Nb2/3)O3(PMN),Pb(Sc1/2Ta1/2)O3andLamodifiedPbZr1xTixO3(P…  相似文献   

6.
1.IntroductionMultiwalledcarbonnanotubes(MWNTs)werefoundbyoneofthepresentauthors(S.Iijima)〔1〕insidethecathodedeposits,whichwereobtainedbyanotherauthor(Y.Ando)〔1,2,3〕asbyproductsoffullereneproductionusingaDCarcdischargeevaporationininertgas.TheMWNTsc…  相似文献   

7.
1.IntroductionBAS(BaOAl2O3SiO2)glassceramicswithcelsianasmaincrystallinephasearepotentialmatricesofrefractoryfiberorwhiskerreinforcedcompositesduetothehighmeltingpoint(1760℃)andgoodoxidationresistanceofcelsian.Celsianwithmonoclinicstructureisstab…  相似文献   

8.
1-IntroductionCarbonisaprevailingresidualimpurityinundopedsemiinsulating(SI)GaAscrystalsgrownbytheliquidencapsulatedCzochralski(LEC)technique,anditpredominantlyoccupiesthearsenicsiteasacceptorCAs.Sincethemassofcarbonatomismuchlighterthanthatofars…  相似文献   

9.
1 INTRODUCTIONDuringthelast15years,thescientificresearchprogramoftheDivisionofmaterialsSciences(DMS)andtheappliedtechnologyprogramsoftheOfficesofEnergyEfficiencyandRenewableEnergy(EE)andofFossilEnergy(FE)havesupportedresearchontheorderedaluminide…  相似文献   

10.
1.IntroductionTheuniquepropertiesofdiamondlikecarbon(DLC)filmsareattractinganincreasingamountofattentionowingtotheirsmoothsurface,excellenttribologicalpropertiesandadjustableopticalproperties〔1〕.Plasmabasedionimplantation(PBII)techniquehasbeenapromi…  相似文献   

11.
ElectrodeProcessofY(Ⅲ)onNickelElectrodeandSurfaceMetallizingZhouChungen(周春根)(UniversityofAeronauticsandAstronauticsBeijing,Be...  相似文献   

12.
1 INTODUCTIONShapememoryalloys(SMAs)areexcellentcandidatesforcontrolsystemsandarecommonlyreferredtoas“smart”materialsduetotheirabilitytochangeshapewithtemperature.Thesealloyscanalsogeneratesignificantamountsofstrain(andstress)andareidealforuseinact…  相似文献   

13.
1 INTRODUCTIONToobtainchromiumcoatingbyelectrochemicalprocedure,electrodepositionfromenvironmentallyfriendlyCr(Ⅲ)bathismoreacceptablethanthatfromtoxicCr(Ⅺ)(chromiumacid)bath.Numerousattemptshavebeenmadetodepositchromiumfromitstrivalentstate,howeve…  相似文献   

14.
1.IntroductionDueto6%(vol.)CO2,H2S(approximately150mg/m3)andwatervaporcontainedinaccompanyinggasofcrudeoilatproductingliquefiedgasandlightoil,pipescorrosionareseriousafterseveralyears’running.Especiallywhentherearecondensatewaterandoilsludgeremaini…  相似文献   

15.
ElectronicTheoryofThermodynamicAdhesioninMetal/CeramicSystemsLiJian'guo(李建国)(InstitutfurNichtmetallischeWerkstoffe,TchnischeU...  相似文献   

16.
1IntroductionPulsedlaserdeposited(PLD)diamondlikecarbon(DLC)filmsareveryhardduetothehighenergyionicspeciesintheplumeproduc...  相似文献   

17.
1.IntroductionTheheataffectedzoneisinhomogeneous,themicrozonesofwhichhavegreatdifferenceincomposition,microstructure,grainsizeandperformance.ToughnessdeteriorationinHAZofHSLAsteelmainlytakesplaceinthecoarsegrainedzone(CGHAZ),theintercriticalzone(I…  相似文献   

18.
1IntroductionRaredispersiveelementsGa,InandTlformthecomplexesofdiferentcoordinatenumber(CN)orcoordinatestructure(CS)withamin...  相似文献   

19.
1 INTRODUCTIONSomefineceramicwhiskerorparticlereinforcedaluminummatrixcompositescanexhibitatotalelongationof200%~600%atahighstrainrate(>10-2s-1)[1~8].Thehighstrainratesuperplasticity(HSRS)isveryattractiveforcommercialapplicationsbecauseoneofthemaj…  相似文献   

20.
1-IntroductionBoroncarbidereinforcedaluminacomposites(Al2O3/B4C)haveimprovedflexuralstrengthandfracturetoughnessoverthealuminaceramic[1].Moreover,sincebothboroncarbideandaluminahavelowdensities(2.51and3.98g/cm3,respectively),theresultingcomposite…  相似文献   

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