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ID:36819104
大小:2.79 MB
页数:66页
时间:2019-05-16
《挤压模具用高性能烧结钼材料组织与性能的研究》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、中南大学硕士学位论文ABSTRACTABSTRACTMoSi2powderandLa203/MoSi2compositemicro·particlesweresynthesisedbymechanicalalloying(MA)method.PureSinteredMoandthesinteredMowithdifferentadditionofLa20a/MoSi2werepreparedthroughPowderMetallurgy(PA)method.Themicrostructure,physicalandmec
2、hanicalpropertiesofthepureMoanddopedMoalloysweremeasured.Theresultsshowthat:themainphasesinthedopedMoareMo,La203andMosSi3;thegrainsofMomatrixwererefinedbecauseofLa203/MoSi2doping;therelativedensityofanyoneofthedopedMoislowerthanthatofpureMo;thesiteredMowithhigher
3、dopingcontenthashigherhardnesscomparedwiththepureMo,whilethehardnessofthesiteredMowithlowerdopingcontentislower;thethermalexpansioncoefficientofthedopedMowith1.0wt%dopingcontentishigherthanthatofpureMo;theadditionofO.5wt%or1.5wt%La203/MoSi2hasimprovedthethermalco
4、nductivityofsinteredMo;theroom-temperaturebendingstrengthesofthedopedMoareallbetterthanthatofpureMo,exceptthatofthesinteredMowith1.5wt%dopingcontent;thedopingofLa203/MoSi2hasachievedgoodtougheningeffectonthesinteredMoatroomtemperature.MosSi3,whichhasgoodhightempe
5、ratureanti—creepstrength,Wasacquiredthroughthein-situreactionbetweenMoandMoSi2,thusthehightemperaturestrengthofthedopedMoisfarbetterthanthatofpureMo;thesinteredMowith1.0wt.%additionhasthebestcomprehensiveproperties;thesinteredModopedwithLa203/MoSi2arestrengthened
6、andtoughenedbythecombinedstrengthening-tougheningofgrainrefiningandthesecondphaseparticles.ExtrusiondieWasmanufacturedusingthesinteredModopedwith1.0wt.%La203/MoSi2compositeparticles.KEYWORDS:sinteredmolybdenum,La203/MoSi2,microstructure,extrusiondie,propertiesⅡ中南
7、大学硕士学位论文目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.IABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。II目录⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯I第一章文献综述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1.1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11.2钼的基本性质⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1
8、1.2.1钼的物理性质⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1.2.2钼的化学性质⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21.3镅的应用⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。31.4挤压模具材料的现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一51.5钼的低温脆性⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
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