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1.
1 INTRODUCTIONLithiumiswidelyusedinthefieldsofaerospace ,atomicenergy ,metallurgy ,chemicalengineering ,electronics ,glassandceramics  相似文献   

2.
1 INTRODUCTIONBioleachingprocesseshavebeenusedextensivelytorecoverbasemetals (mainlycopper)anduraniumfromlow gradeoresandmorerecen  相似文献   

3.
1 INTRODUCTIONTiAlalloyhaslongbeenconsideredasapromis ingmaterialforhightemperatureapplication ,duetoitsexcellenthightemperature p  相似文献   

4.
1 INTRODUCTIONModeⅡ (shear)fractureisoneoftypicalfailurepatternsinrockengineering .Ithasattractedanin creasingattentioninrecentyears ,throughboththeo reticalstudyoffracturecriterion[1~ 4 ] andlaboratorytestingoffracturetoughness[5~ 8] .Althoughanum beroftestingm…  相似文献   

5.
Thermodynamics of Zn(Ⅱ)-NH_3-NH_4Cl-H_2O system   总被引:19,自引:5,他引:14  
1 INTRODUCTIONAmmoniazincmetallurgyhasthemeritsofeasypurificationandsimplifiedprocess ,soithasbeenre searchedextensively .Wehavestudiedupthethermo dynamicsinthesystemsofZn(Ⅱ ) NH3 (NH ) 2 SO4 H2 O[1] andZn(Ⅱ ) NH3 (NH) 2 CO3 H2 O[2 ] anddis coveredtherulesofzincsolubility …  相似文献   

6.
1 INTRODUCTIONThestudyofmoltenstructureofCaO SiO2 ,whichactasthebasicfactorinfluencingthephysicalandchemicalpropertiesofthesilicat  相似文献   

7.
1 INTRODUCTIONItiswellacceptedthatmoisture inducedembrit tlementisthemajorcauseofthelowductilityandin tergranularfailureofNi3Aland  相似文献   

8.
1 INTRODUCTIONThecorrosionofachromatezincattheinitialstageisthedecreasing processofsurfacelightness ,andisusuallycalledmelanization (black patina)ofzincplateofwhichtheproductisZn1 δOwiththepropertyofann typesemi conductor ,andtheillumi nationsuppressestheme…  相似文献   

9.
1 INTRODUCTIONTheimportantbacteriainbiohydrometallurgyaremainlyaerobicchemolithotrophicspecies ,ofwhichthemoreimportantareThiobacillusferrooxi dansandThiobacillusthiooxidans .ThepropertiesofthetwospeciesareshowninTable 1.Theycatalyzetheoxidationofsomeora…  相似文献   

10.
Behavior of Fe and S in bioleaching of pentlandite   总被引:4,自引:1,他引:4  
1 INTRODUCTIONOxidizingprocessbyautotrophicbacteria ,suchasThiobacillusferrooxidans (Hereinbelowbeabbre viatedtoT .f .) ,hasbeenwidely  相似文献   

11.
1 INTRODUCTIONThecontinuouscastingwithsoft contactedmouldisanewlydevelopingtechnologyforsteelandotherheavymetals[1~ 3] .Itcanimprovethesurfacequalityandincreasetheequiaxedcrystalregioninbil letefficiently ,soitwaspaidgreatattentionsintheworld[4 ,5] .Nowexperim…  相似文献   

12.
1 INTRODUCTIONHydrogenreductionoftungstenoxides,subsequentmixingwithcarbonblackandcarburatingisthemostcommonwaytoproducetungstencarbidepowdersforthehardmetalindustry.Thistechniquehasbeenpracticedfordecadesandcalled“conventionalhydrogenreductionprocess…  相似文献   

13.
1 INTRODUCTIONThereliabilitydesignoptimizationofmachinecomponentisbasedonthefoundationofneotericmathematicalprobability ,mathematicalstatisticsandoptimization .Itusuallydealswithhighdimensional,nonconvexandnonlinearobjectfunctionssubjecttovariousstochas…  相似文献   

14.
1 INTRODUCTIONNewmaterials ,suchasdispersionstrengthenedalloy ,amorphousandintermetallics ,canbeobtainedbymechanicalalloyingwhichsh  相似文献   

15.
1 INTRODUCTIONOwingtotherequirementsofrepeatedserviceandlongworkingtimeofhightemperatureburners ,suchasspacecraftengine ,thematerialoftheburnersshouldhavegoodstructureprocessability ,aswellashightemperatureresistance ,thermalshockresistanceandthermalfati…  相似文献   

16.
Control of deflection deformation of plate-shape castings in solidification   总被引:1,自引:0,他引:1  
1 INTRODUCTIONAnorderoflargeplatecastingsusuallybafflesthemanufactures,asthedeflectiondeformationisliabletooccurduringsolidificationofthecastings .Thecommonwaytosolvethisproblemistopursueanoptimumcastingprocessroutebytrialanderrormethod ,ortokeeplargerm…  相似文献   

17.
1 INTRODUCTIONTheobligatechemoautotrophicbacteriawhichisnamedThiobacillusferrooxidans,istheprimaryor ganismimplicatedinthebioleachingofseveralsul fides .Itscommercialpotentialintherecoveryofmet alfromlow gradeandrefractoryores ,desulfurizationofcoals ,andi…  相似文献   

18.
1 INTRODUCTIONHeterogeneousphoto catalysisshowsgreatpotentialforapplicationsingaseousoraqueousorganiccontami nantsdecontamination  相似文献   

19.
Thermal contraction phenomenon of cluster structure of indium melt   总被引:6,自引:0,他引:6  
1 INTRODUCTIONWiththedevelopmentofmodernscienceandtechnology ,thestructureandpropertiesofsolidstatehavebeendeeplyunderstood .Howev  相似文献   

20.
1 INTRODUCTIONAluminumbronzepossessesexcellentphysical,mechanicalandtribologicalproperties .Itisavailableformakingwear resistingan  相似文献   

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