挤压模具用高性能烧结钼材料组织与性能的研究

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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⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯