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1.
1IntroductionTherearealotofnonmetallicmaterialssuchasceramics,fiberreinforcedplasticsandvariouswoodbasedproducts,nonferrousmetalsandalloys,andcompositeswhichcannotbemachinedusingcementedcarbidecuttingtools.Withthecontinualdevelopmentsandengine…  相似文献   

2.
1IntroductionAsacriticalmaterialbeingserved,titaniumanditsalloyswerewidelyusedinaerospaceindustry.Sincetitaniumalloyspossessbetterperformancesthanconventionalstructuralmaterials,suchasstrengthtoweightratio,corrosionresistance,heatresistanceetc.,…  相似文献   

3.
1 INTRODUCTIONRaneyNicatalyst,whosecomponentisNiAlalloy,isafinepowderknownashydrogenationcatalyst.Accordingtothechemicalreaction,sometimesRaneyNicatalystmustbefilledwithsomemircroelementsofcatalystacceleratorsuchasCr,Cu,Co,Mn,Fe,etc.Theskeletonni…  相似文献   

4.
1.IntroductionManymetallurgistshavestudiedhowtogetelectrolyticbinaryalloys,suchasAlSi,AlTiandAlMnect.inaluminumelectrolyzer〔1,2〕.G.Q.YangandX.Q.Guetc.producedAlSi(205%)Ti(025%)Fe(030%)multicomponentalloythroughdirectlyelectrolyzingbauxitein…  相似文献   

5.
1.IntroductionCeramicspreparationviaprecursorpyrolysishasbeenshowingagreaterpromisesincetheonlycommerciallyavailablesiliconcarbidefiber,NicalonTM,wasproducedthroughsuchamethod〔1〕.Nowpreceramicpolymersarefindingapplicationsinmuchbroaderfields,suchasCe…  相似文献   

6.
1.IntroductionHighreactivityandgoodphysicalandchemicalhomogeneityofultrafineceramicpowdersenablesdensificationofthematerialsatlowertemperaturesandmicrostructurecontrolonalevelof1~100nm〔12〕.Yttriumoxideisoneofthemostimportantceramicmaterialsandisuse…  相似文献   

7.
HARDNESS AND WEAR RESISTANCE OF ELECTROLESS NICKEL DEPOSITS   总被引:1,自引:0,他引:1  
INTRODUCTIONElectrolesNiPdepositshavebeenwidelyusedindiversefieldsfortheiruniquecombinationofpropertiessuchascorosionresist...  相似文献   

8.
1 INTRODUCTIONThecreepresistanceoftwophasetitaniumaluminidealloyshasbeenconfirmedtodependnotonlyonlamellarvolumefractionorgrainsizebutalsoonotherparameterssuchasthemorphologyofeachphase[1-4].Thepresenceoflamellarinterfacesleadstoimprovedcreepresis…  相似文献   

9.
1.IntroductionAlotofequipmentworksunderelevatedtemperatureandhighpresureenvironmentinpetrochemicalindustry.Notonlyplasticand...  相似文献   

10.
1.IntroductionThepositionofpipetransportbecomesmoreandmoreimportantalongwithhighspeeddevelopingofmodernindustry.Nevertheless,nevercommonmetalnornonmetalmaterialwerecapableofactioninthecostandfunctionwhenitfacedupthebadenvironmentsuchaswear,erosionan…  相似文献   

11.
1.IntroductionAlumniummatrixcomposite,duetoitsexcellentcomprehensivepropertiessuchashighspecificstrength,highspecificmodule,resistancetoelevatedtemperature,resistancetoradiationandgooddimensionalstability,hasattractedgreatattentionfrommaterialscie…  相似文献   

12.
Surface Carbonization of Mo-La2O3 Cathode   总被引:1,自引:0,他引:1  
1 INTRODUCTIONCarbonizationisveryimportanttomanufacturingdirectheatingmetalliccathode,whichleadstolowertheoperatingtemperatureandimprovethestableemission.Intherecentyears,themolybdenumaddedwithrareearthoxides,suchasLa2O3,hasbeenstudiedasaveryhope…  相似文献   

13.
1.IntroductionAmmoniumthiotungstateisusedasrawmaterialforpreparingWS2〔1〕bythermaldecompositionmethod.AsWS2hasmanyadvantagessuchascorrosionresistance,nopoison,nopollution,widetemperaturerangeforapplicationandsmallfrictioncoefficient,itisextensivelyus…  相似文献   

14.
1 INTRODUCTIONThepreparationofAlSialloysbyelectrothermalprocesshasbeenadvancingmoregreatlythanthatbycryolitealuminameltingelectrolysis.Ithasmanyadvantagessuchasshortcircuit,smallinvestmentofequipments,highproductionandutilizationrateofenergy.Espec…  相似文献   

15.
1.Introduction45steelisusedwidelyinChina.Theprocessisasusualthefollow:forgingmachiningroughlyquenchingtemperingathightemperaturemachiningfinely.Consumingenergyandbadsurfaceconditionarethemajordefectsofthisprocess.Sometimesthefine,homogeneousaust…  相似文献   

16.
1 INTRODUCTIONRecentstudieshavedemonstratedthatanumberoforderedintermetallicscontainingreactiveelements,suchasAl,Ti,andSiaresusceptibletoenvironmentalembrittlementwhentestedinairatroomtemperature.Thisphenomenonisbelievedtobeahydrogenembrittlementp…  相似文献   

17.
1.IntroductionWettabilitybetweenceramicandmetalisaveryimportantaspectoftheresearchanddevelopmentofCeramic/MetalComposites(CMC),whichhasagreateffectonthemicrostructureandpropertiesofCMC.Howevertheclassictheoryandmethoddidn’tshowtheinnerconnectionofco…  相似文献   

18.
1 INTRODUCTIONAstheparticlereinforcedaluminummatrixcompositesaresuperiorinstrengthandwearresistance,theapplicationsofthecompositeshavebeenadvancedinmanyaspects,suchasinautomobilepartsandsportsarticles[1~3].However,forthemassiveproductionofthecompos…  相似文献   

19.
1.IntroductionThesiliconnitride(Si3N4)issuitableforapplicationsasprotectivecoatingsduetoitshighhardness,superiorchemicalstabilityandmechanicalpropertiesathightemperature,suchasresistanceagainsthotshockandhotfatigue.TheSi3N4filmsweremainlyproducedb…  相似文献   

20.
Hot top electromagnetic casting research of Al thin slab   总被引:3,自引:0,他引:3  
1 INTRODUCTIONElectromagneticcasting(EMC)isamouldlesscontinuouscastingtechnologywithwhichliquidmetalisshapedbyelectromagneticforceandithasadvantagessuchas:smoothingotsurface,compact,homogeneoustissueandhighercastingvelocity.EMCtechnologyhasbeendev…  相似文献   

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