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ID:32708771
大小:3.07 MB
页数:58页
时间:2019-02-14
《高能球磨法制备agsnolt2gt电接触材料的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文采用高能球磨法制备了纳米级Ag.sn02电触头材料。通过对球磨工艺条件:球磨介质、分散剂,球料比和球磨时间等参数的研究,得到了高能球磨法制备纳米级Ag—Sn02电触头材料的最佳工艺参数;并研究了稀土La203的不同含量及稀土氧化物种类对触头材料性能的影响和作用机制。研究结果表明:通过对Sn02高温扩散掺杂Ti02的处理,可以改善触头材料的导电性、导热率、溶液流动性,降低Ag—sn02电触头材料的电弧腐蚀率;高能球磨法制备的纳米级Ag-Sn02电触头材料使材料的密度、硬度和导电性等性能得到明显的提高。研制的材料具有硬度高、
2、导电性好、组织均匀弥散的特点,具有很好的开发和应用前景。扫描电镜的显微组织观察和能谱分析证明,sn02与稀士氧化物都均匀分布在银基体中,稀土La203则主要分布在晶界处:由于稀土在晶界处的分布,阻止了Ag.Sn02晶粒的长大,明显的起到了细化晶粒和弥散强化的作用,从而提高了材料的物理和机械等性能。但是由于稀土在晶界处的存在,增大了电子散射的几率,从而影响了材料的电性能,而适量稀土的加入能够在提高材料机械性能的基础上,少量的降低材料的电性能。关键词:电触头材料;Ag-Sn02;高能球磨;稀土氧化物;弥散强化。Inthis聊,We删
3、yprodueodaNano-A=,-Sn02contactmaterialbyhighener舒bar面蜘gmf驰曲r黜hingconditionsofballminingtechnics,suchasmediumsofballmilling,dispersants,theratiobetweentheweightofmaterialsandballs★thetimeoftrailing,距dsoo珥wehavegainthebestoptima]parametersofproducingNano—Ag-Sn02electri
4、calcontactmaterialbyhighenergyballmilling,andstudied.theinfluencesandoperationalprinciplesofperformancesofelectricalcontactmaterialsbythedifferentquantitiesofLa203andthedifferentthuliumoxides,Theresearchingresultsindicatethattheperformancesofcontactmaterials,suchasel
5、ectricalconductivity,rateofheattransmits,fluidityofliquidareremarkablyimprovedbymanagementofhightemperaturediffusedadulteratingSn02withTiOz,whichalsohasreducedtheelectricalarcerosiveprobabilityofAg—Sn02electricalcontactmaterials,thephysicalpropertiesofNano—Ag—Sn02con
6、tactmaterials,suchasdensity,hardness.electricalconductivityaferemarkablyimprovedbyhighenergyballmilling.Thematerialsthatproducedbythistechnologyhavehigherhardness,finerelectricalconductivity,finerandmoredispersivemicrostructure,whichhasafavorableforegroundofapplicati
7、on.TheSEMpictures}ofmicrocosmicstructureandanalysisofEDSindicatethatbothSn02andthuliumoxidedistributeequablydispersivelyintheAg—base,andLa203mainlydistributeinthecrystalboundarywhichpreventtheAg—Sn02crystalparticlesfromgrowingup,anditobviouslyhasfunctionsofmakingcrys
8、talparticlesthinedanddispersions口engthened30ast0improvethemechatucalandphysicalproperties.But,becauseofthiscondition,itincreasesthe
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