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1.
1 INTRODUCTIONHighporositymetalmaterialsarewidelyapplieddailyfortheirspecificcharacteristic[1~5].Asengineeringmaterials,themechanicalpropertiesarebasicforthem[1,3,5].Porousbodiesneedbetensioned,pressed,bentorshapedinsomecases,sohighporositymetalmat…  相似文献   

2.
1IntroductionIn1970′s,manyresearchersbeganstudyongold(Ⅰ)extractionfromalkalinecyanidesolution[1,2],butitwasinteruptedduetoth...  相似文献   

3.
1-IntroductionGermanates,withresemblancetosilicatesinchemicalproperties,havebeensynthesizedbymanymethods,suchashightemperaturesolidreaction,hydrolysiscondensationpolymerizationofmetallicorganiccompoundsandhydrothermalcrystallization[1~3].Especiall…  相似文献   

4.
1IntroductionRef.1,2reportedthestudyresultsofCoPrbinarysystem.Theyobservedtheexistenceofnineintermetaliccompounds,Pr2Co17,...  相似文献   

5.
1 INTRODUCTIONAstheparticlereinforcedaluminummatrixcompositesaresuperiorinstrengthandwearresistance,theapplicationsofthecompositeshavebeenadvancedinmanyaspects,suchasinautomobilepartsandsportsarticles[1~3].However,forthemassiveproductionofthecompos…  相似文献   

6.
1 INTRODUCTIONDuringpasttwentyyears,compositecoatingsproducedbylasercladdinghaveshowngreatperspectiveinmaterialsurfacehardeningbecauseoftheirhighmicrohardness,excellentwearresistanceandgoodcorrosionresistance[1].Thiskindofcoatingsismostlyformedwith…  相似文献   

7.
1 INTRODUCTIONOnewaytoselectcandidatealloysofpossibleinterestforhightemperatureapplicationsistorequireacombinationofhighmeltingtemperatureandlowdensity,asreportedbyFleischer[1].Heshowedthat,ingeneral,L12alloysareprobablynotverygoodcandidates,since…  相似文献   

8.
1 INTRODUCTIONTiAlalloyshavebeenreceivinganincreasingattentionbecauseoftheirhighspecificstrength,excellentstiffness,goodoxidationresistance,andcreepresistance[1-3].However,thesealloyssufferfromalowductilityuptoabout600℃.Extensiveinvestigationofallo…  相似文献   

9.
1 INTRODUCTIONThemechanismandchemicalprocessfordissolvinggoldinacidicthioureasolutionwerestudiedbymanyresearchers[1~5],whogenerallythoughtthatthioureaasastrongligandcomplexesselectivelywithgoldiontoformstablecomplexionAu[CS(NH2)2]+2,andsomeoxidants…  相似文献   

10.
1 INTRODUCTIONAsresearchgoesonthedeficiencieswithTiAlbasedalloyshavebeenovercometosomeextent.Thesedeficienciesincludelowroomtemperatureductility,lowhotplasticdeformationability,andinadequateoxidationresistanceattemperaturesabove850℃[1-3].Asaresult,…  相似文献   

11.
1IntroductionManyanalyticalmethodsforthequantitativedeterminationofLa(Ⅲ)havebeenreported[1,2],inwhichrelatedCLanalysishasneverbeeninvolved.Inthispaper,anewmethodofflowinjectionCLapplicationforthedeterminationofLa(Ⅲ)ionispresented.Itisbasedontheinh…  相似文献   

12.
WROUGHT TiAl ALLOY DESIGN   总被引:10,自引:3,他引:7  
1 INTRODUCTIONSincethefirstmeasurementsofmechanicalpropertiesandoxidationresistanceinabinaryTiAlcastalloyintheearly1950’s,ensuingreports[1-4]haveconfirmedvariouspropertiesbeneficialtohightemperaturestructuralapplicationsincludinglowdensity,excellen…  相似文献   

13.
1 INTRODUCTIONGenerally[1~4],fractureinsuperplasticdeformationisintergranular.Butatacertaincondition,itcanexhibitalocalinteriorfracture.Ref.5realizedthatsuchaparticularfracturewascreatedbyahighlocalstresscausedbytherotationandrearrangementofthegra…  相似文献   

14.
EIGEN THEORY OF ELASTIC DYNAMICS FOR ANISOTROPIC SOLIDS   总被引:6,自引:0,他引:6  
1INTRODUCTIONTheconceptofeigenelasticityoriginatedfromKelvin’swork[1,2].Itisinlastdecadethateigenelasticitywasstudiedagainand...  相似文献   

15.
1 INTRODUCTIONB2ororderedbodycenteredcubiccrystalcompoundsoftenexistoverarangeofcompositionsoneithersideofthestoichiometriccomposition[1].Deviationsfromthestoichiometriccompositionareaccommodatedbyconstitutionaldefects,thatis,eitherbyvacanciesonth…  相似文献   

16.
1INTRODUCTIONTheresearchofnanometermetal,ceramicsandpolymerhasbeingflourishedinworldsinceGleiterH[1],preparedthenanometerpart...  相似文献   

17.
1-IntroductionSincerareearthelementshavestrongaffinitytooxygen,sulphurandotherdetrimentalelements,deoxidation,desulphurizationandremovalofdetrimentalelementscanbecarriedoutbyadditionofrareearthelementstoliquidcopper,achievingacleanliquidcopper,clea…  相似文献   

18.
1INTRODUCTIONYbNialoycanbeusedtomanufacturefunctionalmaterials[1,2].ItisnecesarytostudytheelectrochemicalbehaviourofYb(Ⅲ)onN...  相似文献   

19.
Dislocation evolution with rheological forming of metal   总被引:7,自引:4,他引:3  
1 INTRODUCTIONUntilnow,formostoftheappliedengineeringmaterials,therewouldbesomeinternaldefectsinthem;forexamples,impurities,cracks,cavities,pointdefectssuchasdisplacedatomorforeignmatteratoms,andlinedefectssuchasdislocation,planedefectscausedbypiled…  相似文献   

20.
1INTRODUCTION6201Aluminumaloyisusedforoverheadconductivewire,whichcanbefabricatedbythefolowingmethods[1-4].(1)Conventionalpro...  相似文献   

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