微波烧结wc-co合金脱碳控制与vc对其组织和性能的影响

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1、ABSTRACTInpreliminarystudiesbyourgroup，wefoundthatdecarburizationformedanddecreasedgraduallyfromsurfacetothecenterhasappearedinmicrowavesinteredWC—Coalloys，whichaffectedbendingstrengthofthealloyseriously．BymicrowavesinteringYGl2andYGl3alloys，thereasonsforde

2、carburizationduringtheprocessinghadbeenstudied．Moreover,addingcarbonblackinthespecimensandincreasingsurroundingcarbonpotentialmethodstopreventthedecarburization．Inthiswork，VCwasusedasthegraingrowthinhibitorintheprocessofpreparationofmicrowavesinteringWC-12C

3、o—xVCalloys．AndwiththeadditionofVC，impactonpropertiesandmicrostructuresofWC—Coalloyundermicrowaveconditionshadbeenstudied丁hisworkmadethefollowingconclusions：(1)Whensamplesmicrowave—sinteredinN2atmosphere，YGl2andYGl3alloysappeareddecarburization，andthesurfac

4、eofsamplesdecarburizedseverelythantheinternalDecarburizationwascausedbytheoxidationofsamples，inwhichcase，oxidation，sinteringatmospheredecarburizationandmicrowaveeriectsmadeCdiflusionrateincreasedandtheC／Wratioincobaltphaseoutofbalance．(2)Threemethodswereuse

5、dtocontroldecarburizationofthealloysUnderappropriateprocess，when45wt％blackcarbonwasadded，bendingstrengthofYGl2alloyswassignificantlyincreasedto3172MPa．(3)ThemicrostructureofmicrowavesinteringWC一12Co—xVCalloywhichsinteredat1420℃forlOmin，haveshownuniform，fme-

6、grain，grainunimodalandwithoutabnormalgraingrowth．(4)WiththeincreaseofsinteringtemperatureandVCcontents，thealloy’srelativedensityincreasedsimultaneously．Besides，hardnessincreasedwithincrementalVCcontentAndwhenVCcontentwas03wt％，aturningpointwasappearmd，andthe

7、alloy’shardnessincreasedrapidly，untilthemaximumhardnessreached919HRAKEYWORDSmicrowavesintering，WC—Coalloy,decarburization，VCinhibitur目录摘要⋯JABSlRACT⋯11第一章文献综述⋯⋯⋯Il1硬质合金⋯⋯⋯11_11硬质台金的发展历程⋯⋯⋯⋯1112硬质合金烧结技术212微波烧结技术⋯3121微波的基本概念⋯3l2．2微波加热原理⋯⋯3l23微波加热技术特点⋯512．4微波在硬

8、质合金烧结中的应用历程⋯⋯613碳含量对WC-Co硬质合金相成分、晶粒度和性能的影响⋯12131碳含量对WC-Co硬质台金相成分的影响⋯12132碳含量对粘结相成分和WC晶粒度的影响．．13133碳含量的变化对硬质舍金性能的的影响141．4晶粒长大抑制剂⋯⋯⋯141．41晶粒长大抑制剂作用机理⋯151．5论文选题意义及研究内容15第二章研究方法与性能测试1621研究技术路线1622原料技术参数⋯16