共查询到20条相似文献,搜索用时 15 毫秒
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1 INTRODUCTIONTitaniumaluminidesareattractivecandidatema terialsforaerospacestructuralandengineapplica tions ,owingtotheirlowdensi 相似文献
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Bioleaching of refractory gold ore ( Ⅱ )——Mechanism on bioleaching of arsenopyrite by Thiobacillus ferrooxidans 总被引:1,自引:2,他引:1
1 INTRODUCTIONBioleachingprocesseshavebeenusedextensivelytorecoverbasemetals (mainlycopper)anduraniumfromlow gradeoresandmorerecen 相似文献
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1 INTRODUCTIONMechanicalactivationiswidelyappliedinen hancingmetallurgicalprocess[1~ 3] andchemicalsyn thesis[4 ,5] .Sofaritisdifficultt 相似文献
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Microstructure and properties of AZ80 magnesium alloy prepared by hot extrusion from recycled machined chips 总被引:5,自引:0,他引:5
1 INTRODUCTIONMagnesiumalloyshavemanyadvantagessuchaslowdensity ,highspecificstrength ,goodelectromag neticshieldingcharacteristics ,excellentcastabilityandmachinabilityetc .Magnesiumisanabundantele mentsinceabout 1.93% (massfraction)ofearthcrustconsistofmagne… 相似文献
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Effect of coating repair on microstructure and mechanical properties of Ni3Al based alloy IC6 总被引:2,自引:2,他引:0
1 INTRODUCTIONNi3AlbasedalloyIC6,whichisadirectionallysolidifiedhightemperaturestructuralmaterial,hasbeenrecentlydevelopedbyBeijin 相似文献
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Role of Al2O3 fiber in eutectic Al-Si alloy composites 总被引:1,自引:0,他引:1
1 INTRODUCTIONMetalmatrixcomposites (MMCs)havemanyimportantapplicationsinaircraftandautomobilein dustry ,fortheyhavemanyadvantagess 相似文献
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Structures,properties and responses to heat treatment of deformation processed Cu-15% Cr composite powders prepared by mechanical milling 总被引:1,自引:0,他引:1
1 INTRODUCTIONTheinterestindevelopinghighstrengthwithhighconductivitycopper basedalloyshasledtoacon stanteffortonmodifyingtheallo 相似文献
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Effect of high temperature aging on microstructure and mechanical properties of a directionally solidified Ni3Al base alloy IC6A 总被引:2,自引:0,他引:2
1 INTRODUCTIONThedirectionallysolidifiedNi3AlbasealloyIC6AwiththechemicalcompositionofNi (7.5~8.5 )Al (13.0~ 15 .0 )Mo (0 .0 2~ 0 .1)B (0 .0 0 5~0 .0 5 )Y (massfraction ,% )hasbeenrecentlydevel opedbasedonalloyIC6asahigh temperaturestruc turalmaterialusedforadvancedjet enginevanesop er… 相似文献
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1 INTRODUCTIONThecorrosionofachromatezincattheinitialstageisthedecreasing processofsurfacelightness ,andisusuallycalledmelanization (black patina)ofzincplateofwhichtheproductisZn1 δOwiththepropertyofann typesemi conductor ,andtheillumi nationsuppressestheme… 相似文献
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1 INTRODUCTIONThestudyofmoltenstructureofCaO SiO2 ,whichactasthebasicfactorinfluencingthephysicalandchemicalpropertiesofthesilicat 相似文献
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1 INTRODUCTIONTheimportantbacteriainbiohydrometallurgyaremainlyaerobicchemolithotrophicspecies ,ofwhichthemoreimportantareThiobacillusferrooxi dansandThiobacillusthiooxidans .ThepropertiesofthetwospeciesareshowninTable 1.Theycatalyzetheoxidationofsomeora… 相似文献
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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
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LIAO Ji qiao 《中国有色金属学会会刊》2000,10(3)
1 INTRODUCTIONHydrogenreductionoftungstenoxides,subsequentmixingwithcarbonblackandcarburatingisthemostcommonwaytoproducetungstencarbidepowdersforthehardmetalindustry.Thistechniquehasbeenpracticedfordecadesandcalled“conventionalhydrogenreductionprocess… 相似文献
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1 INTRODUCTIONTheevolutionoftextureinaluminumanditsal loysduringdeformationandannealinghasbeeninves tigatedusingtheelectronbackscatteringpattern (EB SP)techniqueinascanningelectronmicroscope(SEM )andtheorientationdistributionfunctions(ODFs)usedforanumberof… 相似文献
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Microstructure and properties of composite of stainless steel and partially stabilized zirconia 总被引:1,自引:0,他引:1
1 INTRODUCTIONOwingtotherequirementsofrepeatedserviceandlongworkingtimeofhightemperatureburners ,suchasspacecraftengine ,thematerialoftheburnersshouldhavegoodstructureprocessability ,aswellashightemperatureresistance ,thermalshockresistanceandthermalfati… 相似文献
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1 INTRODUCTIONRelativelylargeundercoolingisgainedinbulkal loymeltwithmoderatecoolingratebyeliminatingthesolidinclusionsinthemeltandbyeliminatingtheef fectofcontainerwallonthetriggeringofnucleation .Theaccumulateddrivingforceforcrystallizationcaus esrapi… 相似文献
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1 INTRODUCTIONThereliabilitydesignoptimizationofmachinecomponentisbasedonthefoundationofneotericmathematicalprobability ,mathematicalstatisticsandoptimization .Itusuallydealswithhighdimensional,nonconvexandnonlinearobjectfunctionssubjecttovariousstochas… 相似文献
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1 INTRODUCTIONAnorderoflargeplatecastingsusuallybafflesthemanufactures,asthedeflectiondeformationisliabletooccurduringsolidificationofthecastings .Thecommonwaytosolvethisproblemistopursueanoptimumcastingprocessroutebytrialanderrormethod ,ortokeeplargerm… 相似文献
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1 INTRODUCTIONTheobligatechemoautotrophicbacteriawhichisnamedThiobacillusferrooxidans,istheprimaryor ganismimplicatedinthebioleachingofseveralsul fides .Itscommercialpotentialintherecoveryofmet alfromlow gradeandrefractoryores ,desulfurizationofcoals ,andi… 相似文献
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1 INTRODUCTIONNewmaterials ,suchasdispersionstrengthenedalloy ,amorphousandintermetallics ,canbeobtainedbymechanicalalloyingwhichsh 相似文献