復合抑制劑對超細WC-8％Co合金組織和性能的影響.pdf

1、目錄摘要.......................................................................................................................……，.........……IABSTRACT..........................................................................

2、.............................................……nl第一章緒論.......................................……，............................……、......……，.........……、..........……11.1前言......................................................

3、..........................................................................……11.2硬質(zhì)合金的發(fā)展歷程..................……，...............................……11.3超細晶硬質(zhì)合金在現(xiàn)代工業(yè)中的應用.........................................................

4、...............……21.4超細硬質(zhì)合金和納米硬質(zhì)合金研究現(xiàn)狀.................................……‘............................……41.6本課題研究意義...............................................................................................……111，7主要研

5、究內(nèi)容..............................................................................................................……n第二章試驗材料及研究方法...................................，，……132.1試驗的技術(shù)路線.........................................

6、.................................................................……132.2合金制備方法及壓制成型.........................................................................................……132.3燒結(jié)工藝研究方案...............……，...............

7、......................................................……巧2.4性能和組織測試分析方法及儀器..............................................................................……16第三章試驗結(jié)果............................……，..........................

8、.......................................……213.1VC用bC對WC一8%Co超細硬質(zhì)合金性能的影響..........................……，..................……213.2燒結(jié)溫度對BYg性能的影響....................……，........................……，.........................……243.3成

9、型劑加入量對BYg性能的影響............................................................................……27第四章分析討論.....................................................................................................……294‘1影響硬質(zhì)合金性能的因素

10、...............................................……，...................................……294.2VC加bC抑制劑對WC一8%硬質(zhì)合金組織結(jié)構(gòu)的影響.............................................……314.3燒結(jié)溫度對BYg性能組織結(jié)構(gòu)的影響..................................

11、..................................……394.4成型劑添加量對BYg組織結(jié)構(gòu)的影響....................................................................……43結(jié)論......................................................................……，...............

12、....................................……47參考文獻............................................................................................................................……49致謝.……，..........................................

13、..................................................................................……53AbstractAbstractTheinhibitoryeffeetofVCNbCongraingrowthinhibitoroftheUltra一fineCementedCarbldesWC一Co15studiedinthisPaper.TheeffeetsofP

14、roPertiesandmierostrUetoreofWC一8%withdiffereniratiosofVCNbChavebeeninvestigatedusingMettlerToledo，eleetronietestingmaehine，Wienhardmeter，eoereivefeemeter，ZeissmicroscoPe，seaningeleetron，andX一ray.ThebsetofadditionofVCNbCi

15、nhibitorswerefoundbyanalysisingtheVC加bCinhibitionmeehanism，andn姍editBYg.ThebestPreParationfBYg15gotbyehangingthesinieringtemPeratureandthenumberofrubber.Alldtheeonelusionsarefollowing:1)WC一8%CoeangetthebestmeehaniealProP

16、ertieswhentheinLhibitoreontentofVCNbC150.2%VCNbCO.4%，andTRSandhardness151714MPaand1899HV3esPeetively.Thedensityofalloydeereased，andtheHeofalloyinereasedWhenaddeomPoundinhibitorsVCNbC.ThehardnessandTRSexhibitnon一monotonic

17、v而ationswiththeeoneentrationofNbCinthesamequantityofVC，buttheyarehigherthantheonesofalloywithoutaddingNbC.W亡findtheconeentofa一CointhealloyinereasesandnPhasegraduallydisPersesandredueesfromX一raydi價actionresults.2)Thebests

18、interingtemPeratureofBYg151440aC.AlloyhasthebesteombinationPerfmaneewhenatthistemPerature，theTRS151787MPa，andhardness151950HV30.WiththeinereasingsinieringtemPerature，Porosityfirstdeereasesandtheninereases，WCgrainsizeenla

19、rgeseontentof月Phasedeereases.BYghasthebesteombinationPerformaneewhenat14400C，BYghaslessPorosity，andgrainsizeis470nm，noabnormalgraingrov幾h.3)The月PhaseinBYggduallydeereasesandeventuallydisapPearswiththeinereaseofformingage

20、ni，andgraphite15observed.Whentheadditionofrubber15110mlkg，thealloyhasthebestPerfmanee誠thfewnPhasesandnographitePhase.4)VC閃bCcaneffeetivelyinhibittheWCgraingrowthinalloyduringthesinteringProeess，andhasbettereffectthanVC.B

21、othPorosityand月PhaseinereasewhenaddingVCtoalloy.WhenthePercentageofinhibitor150.6%，addingNbCeanredueetheapPearanceofPorosityandtheeonientof月Phaseinalloys，whilecaninereasetheeontentofa一Co.5)TheinhlbitionmeehanismofVCaredi

22、fferentfromNbC，bothofthemeontrolgrainsizeatdifferenttemPeratureranges.Atthestageofsolidstatesiniering，VCandNbCadsorbingontheWCsuxfaeehindertheeombinationandgrowthofWCgrain，attheearlystageofliquidPhasesintering，VCandNbCre