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1.
Bond strength of W-Cu/CuCr integrated material   总被引:3,自引:0,他引:3  
1 INTRODUCTIONW Cu/CuCrintegratedmaterialnowisusedaselectriccontactmaterialinhigh powerswitcher[1] .TraditionalprocessofbondingW CucompositeandCuCralloyiswelding .BecauseweldingdefectsoftenappearatW Cu/CuCrweldinginterface ,theinter facebondislowandunstable[2…  相似文献   

2.
1IntroductionMoreandmorecarbonatemeltshavebeenemployedtoserveaselectrolyterecently,especiallyinmoltencarbonatefuelcells(MCFC).MCFCisbelievedtobeoneofthemostpromisingnewenergyconversiondevicethatconvertschemicalenergyinfossilfuelsintoelectricity[1~3].MCFCt…  相似文献   

3.
1.IntroductionWettabilitybetweenceramicandmetalisaveryimportantaspectoftheresearchanddevelopmentofCeramic/MetalComposites(CMC),whichhasagreateffectonthemicrostructureandpropertiesofCMC.Howevertheclassictheoryandmethoddidn’tshowtheinnerconnectionofco…  相似文献   

4.
1.IntroductionTheactivitiesofMgCl2intheLiClMgCl2KClandCaCl2MgCl2NaClmoltensaltelectrolytesareanimportantparametertotheelectrolyticproductionofmagnesium.LiClandKClcanobviouslyimprovethepropertiesoftheelectrolyticsolution.NaClandCaCl2arethemajorcom…  相似文献   

5.
1-IntroductionCarbonisaprevailingresidualimpurityinundopedsemiinsulating(SI)GaAscrystalsgrownbytheliquidencapsulatedCzochralski(LEC)technique,anditpredominantlyoccupiesthearsenicsiteasacceptorCAs.Sincethemassofcarbonatomismuchlighterthanthatofars…  相似文献   

6.
1 INTRODUCTIONCuCralloysareimportantcontactmaterialsforvacuuminterruptersandarewidelyusedforhighvoltageapplicationsbecauseoftheirconsiderablehighinterruptingabilityandhighvoltagewithstandingstress[1].Presently ,themainmethodsofpreparingCuCralloysinclude…  相似文献   

7.
0 IntroductionInthealternativecurrent(AC)arcwelding,whentheelectrodepolaritychangesperiodically,thearcextinguishesandrestrikes,whichleadstheACarcislessstablethanDCarc[1].Tillnow,thereisnotageneralacceptedtheorytoexplaintheACarcrestrikingphenomenonofnonthe…  相似文献   

8.
1.IntroductionSiChasbeenwidelyusedasspecialrefractories.Withdifferentbondingphases,SiCrefractoryscanbeclassifiedintooxide/SiC,Si3N4/SiC,Sialon/SiCandSiC/SiCsystems.TheSialon(Si6zAlzOzN8x,0<z<4.2)/SiCsystem,duetoitsbetterphysicalandchemicalpropertie…  相似文献   

9.
1.IntroductionNiCrMoalloycastironisoftenusedtomakerollers.AddingSiCparticlesinittoformcompositecanimproveitswearresistanceandimpactstrengthproperties.ThismainlydependsonthestateofdistributionofSiC,SiCfactorandthecombinationstrengthbetweenthetwos.Toi…  相似文献   

10.
1.IntroductionInthescienceofcements,oneofthemostexcitingareashasbeenthatofMOC,MOChavebeenstudiedextensively〔14〕.However,thereisnopublisheddataontheuseofsilicafume.ItisknownthattheabundenceofMOCresourceinChinahasledtosomeappliedresearchstudiesonthisc…  相似文献   

11.
1 INTRODUCTIONCarbonfiberreinforcedcomposites (C/Ccom posites)areimportantforengineeringandscientificapplicationsinaerospaceindustrybecauseoftheiru niqueproperties .Currently ,besidesbeingusedasaircraftbrakes ,theyarealsousedasrefractorymate rial,corrosionr…  相似文献   

12.
1.Introduction23NiCo,CoNialloysteel,strengthenedbyC,Cr,andMo,hasanoutstandingcombinationofhighfracturetoughnessandhightensilestrength.Unlikeotherhighstrengthsteels,suchas4340and300M,23NiCoislowC,FeNilathmartensticalloywhichattainsitspropertiesthrou…  相似文献   

13.
1 INTRODUCTIONIn 195 8Nakagawafoundthatthereexitsametastablemiscibility gap (MG )inCu Coalloys .Thatis ,whenCu CoalloyissupercooledtoMG ,twoliquidphases ,namelyCo rich phaseandCu richphasewillform[1] .Thisunexpected phasetransfor mationwilcausetheinhomogeneousmicros…  相似文献   

14.
1 INTRODUCTIONTheelectrolytesolutionsofCuCl2 ,NiCl2 ,Co Cl2 ,ZnCl2 ,CdCl2 ,FeCl2 ,HCl,NaCl,KCl,CaCl2 ,MgCl2 ,BaCl2 ,etal,wereofteninvolvedinthehy drometallurgicalprocesses .Thethermodynamicprop ertiesofaqueoussolutionsoftheelectrolytesareveryimportanttoextractivemetal…  相似文献   

15.
1 INTRODUCTIONThecontinuouscastingofaluminumisthefoun dationoftheelectromagneticcasting (EMC) ,whichbeganfromthedirectchillcastinginventedbyAlocaCorporationandVlwCorporationin 1 935[1].TheprincipleofEMCwasfirstlydescribedbyGetselevandhisco workersin 1 960 [2 ].Andt…  相似文献   

16.
1 INTRODUCTIONOntheviewofgeometry ,weathertheshapeisperfectdependsuponchangeofcrownoccurredintherollingprocess.Ifthestretchingoftherollingstockintherollingprocessisneglected ,geometricaldepen denceofperfectshapecanbeexpressedas[1 ] :Ch =hHCH ( 1 )where Chisthe…  相似文献   

17.
1 INTRODUCTIONManystructuralmaterialsforhightemperatureapplicationscontaintwoormoremetallicphases,suchasNiorCobasesuperalloys,andhavedifferentcorrosionbehaviorswithrespecttothecommonsinglephasealloy[1].CuCralloysareidealsystemstostudyhightemperaturecorr…  相似文献   

18.
Stress corrosion cracking of brass in ammonia solution   总被引:1,自引:0,他引:1  
1 INTRODUCTIONTheTEMobservationsshowed[1~ 4 ] thatthecor rosionprocessitselfcanfacilitatedislocationemissionandmotionduringstresscorrosioncracking(SCC)ofbrass,310stainlesssteel,andTi3Al Nb .Nano crackofSCCwillnucleateinadislocationfreezone(DFZ)onlywhenthecorros…  相似文献   

19.
1 IntroductionCopperalloyshavebeenwidelyusedinmarineengineeringandpowerindustryandotherindustryareasbecauseoftheirhigherstrengthandgoodcorrosionresis tance[1~ 3].Thetypicallyandwidelyusedcopperalloysarebrassandcupronickel ,inwhichCu∶Znisequalto 70∶3 0andCu∶N…  相似文献   

20.
Removal of sulfur in coke oven gas by mixing ZnO-based additive into coal   总被引:3,自引:0,他引:3  
1 INTRODUCTIONSulfurdistributionincokingprocessincludestwoparts .OnepartisgoingintoCOGasH2 S ,CS ,COSandC2 H2 SH .TheotherpartisresidualincokeasFeS ,CaS ,S2 andsoon .Traditionally ,theremovalofsulfurofCOGisbysprayingammoniawaterintohotcoalgastoformammoniumsulfat…  相似文献   

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