真空烧结温度对WC-Co硬质合金微观组织及性能的影响  

Effect of Vacuum Sintering Temperature on Microstructure and Properties of WC-Co Cemented Carbide

作　　者：何伟锋[1] 杨宇辉[1] 王珂玮 陈立甲 HE Weifeng;YANG Yuhui;WANG Kewei;CHEN Lijia(School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523800,China)

机构地区：[1]东莞理工学院机械工程学院,广东东莞523800

出　　处：《热加工工艺》2023年第22期72-77,共6页Hot Working Technology

基　　金：广东省企业科技特派员项目(GDKTP2020065800);广东省基础与应用基础研究基金项目(2019A1515110967);2021年广东省教育科学规划项目(2021GXJK286)。

摘　　要：为了研究烧结温度对硬质合金显微组织和力学性能的影响规律,采用真空烧结法制备WC-Co硬质合金。利用万能试验机、X射线衍射仪(XRD)、扫描电镜(SEM)等分别对烧结的硬质合金样品进行了力学性能和微观组织表征。结果表明:随烧结温度的升高,样品的相对密度、硬度和抗弯强度均呈现先升高后降低的趋势。当烧结温度为1450℃、保温1 h制备的WC-Co硬质合金样品的晶粒尺寸与致密度达到最佳配比,该试样具有优异的综合力学性能,密度16.98 g/cm^(3)、硬度2150 HV30、抗弯强度2860 MPa。In order to investigate the influence of sintering temperature on the microstructure and mechanical properties of cemented carbide,the WC-Co cemented carbide was prepared by vacuum sintering method,and the mechanical properties and microstructure of sintered cemented carbide samples were characterized by universal testing machine,X-ray diffractometer(XRD),scanning electron microscope(SEM),respectively.The results show that with the increase of sintering temperature,the relative density,hardness and bending strength of the samples increase at first and then decrease.When the temperature reaches 1450℃and holding for 1 h,the WC-Co sample has the best ratio of grain size and density,which has excellent comprehensive mechanical properties,such as,density of 16.98 g/cm^(3),hardness of 2150 HV and bending strength of2860 MPa.

关 键 词：硬质合金 真空烧结 显微组织 性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]