優(yōu)質粗晶WC粉末及合金的研制.pdf

1、重慶大學碩士學位論文優(yōu)質粗晶WC粉末及合金的研制姓名：黃新申請學位級別：碩士專業(yè)：材料學指導教師：劉清才20041015重慶大學碩士學位論文英文摘要ABSTRACTWhencomparewithconventionalcementedcarbide(middlegrainorfinegraincarbides)，coarsegraincarbidesdemonstrateaspecialpropertiesandapplication，

2、謝t11aserialsmerits，suchashighmicrohardness，lowmicro—strain，fewstucturaldefectsThus，itattractsmoreattentionfromdifferentdepartmentsintheareaofindustryCurrentlyitiswidelyappliedintomanyfieldsandfoundincreasingusageinareass

3、uchasmillingtools，punchingdies，boringdrills，hard—surfacematerialsThestudyanddevelopmentoncoarsegraincarbidesimprovethepropertiesofWCpowderaccompaniedbytheamelioratingthequaiityofcarbidesInthispaperthepropertiesandstructu

4、ralfeaturesofcoarsegrainWCpowderarediscussed，followedbytheoptimizationandadjustifacationoftheprocessingconditionsAnd，bystudycheckandanalysistherelationshipbetweenprocessingparametersandthepropertiesofWCpowderthenewmethod

5、ofproductionWCpowderwerefoundedinthathighqualitycoarsegrainWCpowderwereobtained，withwhichhighqualitycarbidesweremanufacturedAlso，itWasinvestigatedthemainfactorsandmechnismthatinfluencetheproductionprocessofWCpowderAllkin

6、dsofpropertiesofcoarsegrainWCpowderaleinvestigatedbymeansofTEM，electronprobe，stereosean，metailographicexamination，etc，withtheconclusionthattwo—stepcarburizationisoptimumtoobtainhi曲qualityCOarSeWCpowder：Byadoptionfollowpa

7、rameters：firstapportioncarbon45％(weight)，firstcarburizationtemperature：19002000℃，secondcarburizationtemperature：18001900。C，loosepackthehighqualityWCpowderwithFsssgrainsize3545∥m，canbemanufacturedwhosegraingrowthcompletel

8、yandhavefewdefectsHighqualityWCpowderCanbeproductedbytwostepcarburization，whichreducetheoppommityofbombardofWpowderduringtheprocessofcarburizationAnd，WCpowderproductedbytwostepcarburiza：tionhavesomespecialproperties，such

9、as，highcontentofcarbidecarbon，lowcontentoffreecarbon，purephase，lowcontentofimpurities，homogeneouscrystalgrain，homogeneoussubgrainsize，fewmicrodefectsandlowdislocationdensitywhichalsopreventthebombardofWpowderNowthequalit