IR
稀土微合金化对Cu-Al共析合金粉末凝固成形作用机理研究
Project Number50804019
李文生
Abstract用铜铝合金粉未制备表面减摩耐磨层和实施表面修复具有诱人的前景,但铝及铜铝合金亲氧,粉末成形性差、涂(熔)敷层孔隙率高等限制了该类材料在表面工程技术中的应用。开发了一种对克服钣金镜面制品出现表面划痕、滑伤、拉裂等有良好效果的新型高铝(≈14wt.%)过共析铝青铜粉末材料,研究了在该种新型过共析铝青铜粉末中添加稀土元素Ce后对粉末制备、粉末喷涂及喷涂涂层组织的贡献及影响。采用共装法一次快速熔炼,铝预脱氧和稀土终脱氧联合工艺措施可以获得含气检验合格的合金液,并使稀土Ce烧损量控制在8-15%之间。稀土Ce对合金有良好的脱氧、除氢和除渣作用,净化合金液。稀土Ce的加入使粉末粒度分布相对集中,显微硬度平均值可达534HV。Ce的加入使涂层中金属间化合物由FeAl转变为Fe3Al,含Ce喷涂层中的堆垛层错提高了其机械性能。稀土Ce使基体与熔覆层之间的过渡层明显增宽,在过渡层与熔覆层结合面上具有方向性的柱状组织增多,形成组织致密的冶金熔合区。含Ce0.1%的共析铝青铜等离子喷涂层减摩、耐磨性能较好,含Ce0.6%涂层中Fe元素及k相增多,摩擦磨损性能下降。
【英文摘要】UsageofAlandCu-Alpowderinsurfaceengineeringarelimitedbyoxygenphile,lowformingabilityandhighairholesincoatings,althrouththeforegroundofCu-Alalloypowdertobeusedinlowfrictioncoefficientwearresistentcoatingandsurfacemendingisbright.AnovelCu-Aleutectoidbronzealloyconsistingof14wt.%Al.Itisinsensitivetovolumetricwearinlubricatedslidingcontactwithstainlesssteelsheetmaterials.Inthisproject,effectsofRareEarthCetothepowderspreparation,powdersthermalsprayingprocessandcoatingstructureswereinvestigated.Ajointly-chargingone-meltedtechniquewasusedtoacquirethelowgasinvolvedeligiblemoltenalloy,andcontributealowRareEarthCeenvelopmentof8-15%duringthealloymelting.RareEarthCepurringandrefiningthemoltenmetalfromOandHgasextractionandenclosureinspiration.TheshapeofatomizedCu-Aleutectoidbronzepowderswasmoresphericalandthehardnesswasimprovedto534HVbyadditionof0.6%Ce.WithalittlebitofRareEarthCeadded,thewelldistributedmatrixandpromotionofdiffusionleadstotheimprovementinbondstrengthbetweenthecoatingandthematrix.Cu-FenewphasehasbeenobserveddecoratingtheFe-AlintermetallicsintheCeaddedcoatings.TheCehasbeenfoundtostimulatethetransitionoftheFe-containingintermetiallicsfromFeAltoFe3Al.StackingfaultswereobservedinthecoatingwithCeaddition,whichisresponsibleforthereducedwearrateandincreaseofthestrengthening.TheCu-Aleutectoidplasmasprayedcoatingswith0.1%Ceprocessesbetterfrictionandwearpropertiesthenthecoatingswith0.6%Ce.FortherearemoreFeandrougherκphases(Fe3Al)formedonthesurfaceofthecoatingswith0.6%Ce,thusimpairmentthefrictionandwearpropertiesofthecoatingduetotheadhesionofFeandFe3Alintermetiallicstotheferrousbasedcounterparts.
【结题摘要】用铜铝合金粉未制备表面减摩耐磨层和实施表面修复具有诱人的前景,但铝及铜铝合金亲氧,粉末成形性差、涂(熔)敷层孔隙率高等限制了该类材料在表面工程技术中的应用。开发了一种对克服钣金镜面制品出现表面划痕、滑伤、拉裂等有良好效果的新型高铝(≈14wt.%)过共析铝青铜粉末材料,研究了在该种新型过共析铝青铜粉末中添加稀土元素Ce后对粉末制备、粉末喷涂及喷涂涂层组织的贡献及影响。采用共装法一次快速熔炼,铝预脱氧和稀土终脱氧联合工艺措施可以获得含气检验合格的合金液,并使稀土Ce烧损量控制在8-15%之间。稀土Ce对合金有良好的脱氧、除氢和除渣作用,净化合金液。稀土Ce的加入使粉末粒度分布相对集中,显微硬度平均值可达534HV。Ce的加入使涂层中金属间化合物由FeAl转变为Fe3Al,含Ce喷涂层中的堆垛层错提高了其机械性能。稀土Ce使基体与熔覆层之间的过渡层明显增宽,在过渡层与熔覆层结合面上具有方向性的柱状组织增多,形成组织致密的冶金熔合区。含Ce0.1%的共析铝青铜等离子喷涂层减摩、耐磨性能较好,含Ce0.6%涂层中Fe元素及k相增多,摩擦磨损性能下降。
Subtype青年科学基金项目
Project Source国家自然科学基金
2009
End Date2011-12-31
MOST Discipline Catalogue1101 - 冶金与矿业 ; 11 - 工程与技术
Host Institution兰州理工大学
Project Funding210000.0
CountryCN
Language中文
Document Type项目
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64973
Collection兰州理工大学
Recommended Citation
GB/T 7714
李文生.稀土微合金化对Cu-Al共析合金粉末凝固成形作用机理研究.2009.
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