亚微米硬质合金制备过程中碳含量的控制研究

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1、机械科学研究院硕士学位论文亚微米硬质合金制备过程中碳含量的控制研究姓名：肖仲文申请学位级别：硕士专业：材料学指导教师：白佳声20040524机械科学研究院硕士学位论文摘要通过上述研究，提出了烧结过程的优化工艺参数，明显提高了WC一10％Co材料的性能，抗弯强度平均可达3368MPa(最高可达3708MPa)、硬度可达92．8～93．4HRA、密度14．21～14．32g．cm。，从而为该工艺的工业应用奠定了基础。关键词：硬质合金碳含量调整烧结气氛晶粒长大机理机械科学研究院硕上学位论文摘要TheR

2、esearchonCarbonContentControlinPreparationofSuperfineCementedCarbideABSTRACTBytherapiddevelopmentofmanufactureindustrywhichisrepresentedbyautomobileindustry，morehighrequirementsforhardalloytoolsareproposed．Superfinecementedcarbide埘t1111ighhardness．hi

3、ghstrungthhasbeenpaidmuchattentioninmaterialdevelopmentnowadays．Inviewofthecloserelationshipofmaterialperformanceandmaterialmanufactureprocessingtechnology，theresearchOnthestructureandperformanceofthematerialofYGl0cementedcarb试echangingindifferentsin

4、teringatmosphereshasbeentakeninthispaper，andtheoptimizationofthetechnologyparametersisalsosuggested．Inthispaper,mixedgases(CH4andH2)areusedassinteringatmosphere．Thekeytechnicalparameterssuchastemperature，gaspressureandcriticalmethaneconcentrationhave

5、beencalculatedbythermodynamicstheroy．Onthebasisoftheresultsofthermodynamicstheroy，manytestshavebeencarriedon．TheresultsoftheresearchindicatethatwhenthecarboncontentofWCandtheatmospherepressurearecertain．thecarboncontentofsampleaftersinteringissensiti

6、velychanged谢mmethaneconcentration．Whenthemethaneconcentrationishighenough，thegraphitecouldbefoundinthesample．Thetimeofcarbonizationandthethicknessofsamplehaveheavilyinfluencedthecarboncontentofsampleaftersintering．Becauseoftheinterferenceofatmosphere

7、，thefactorsthoseinfluencethecarboncogentofthealloyinatmospheresinteringaremorecomplicatedthanthoseintraditionalvacuumsintering．Sointhispapertheresearchonthesixinfluencefactorssuchascarbonizationtime，methaneconcentration，carbonizationtemperature，WCgen

8、eralcarbon，andsinteringtemperature，aSwellasmixedgasflow，onmaterial机械科学研究院硕士学位论文摘要performancesuchascobaltmagnetism，bendings仃ength，rectifystupidmagneticforceandhardness，havebeendonethroughthemethodofcorrect—crosstest．Theresultsoftheresearchshow，asmetha