混合料料浆固含量对超细晶硬质合金微观组织和性能的影响  

Effect of Solid Content of Mixture Slurry on Microstructure and Properties of Ultrafine-Grained Cemented Carbide

作　　者：姚兴旺 曾瑞霖 董涛 李剑峰 杨继安 曾雨灏 袁军文[1,2] Yao Xingwang;Zeng Ruilin;Dong Tao;Li Jianfeng;Yang Ji'an;Zeng Yuhao;Yuan Junwen(Zhuzhou Cemented Carbide Group Corp.Ltd.,Zhuzhou Hunan 412000,China;State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China)

机构地区：[1]株洲硬质合金集团有限公司,湖南株洲412000 [2]硬质合金国家重点实验室,湖南株洲412000

出　　处：《硬质合金》2025年第1期1-8,共8页Cemented Carbides

基　　金：国家重点研发计划项目(2022YFB3806700);中央引导地方科技发展资金项目(2024ZYT006);中钨高新科技专项项目(20220303)。

摘　　要：研究了3组不同固含量料浆制备的WC-8%Co-0.4%VC超细硬质合金混合料的粉末性能、压制特性和烧结后合金的微观组织及性能。结果表明,随着料浆固含量降低,混合料中细粉含量增加,粒子破碎程度增加,混合料的松装密度从3.4g/cm^(3)逐渐下降至2.5g/cm^(3),流动性从32s逐渐变差至39s,混合料PS21条压制压力从2250N增加至4050N,压坯强度从5.52MPa降低至2.88MPa。料浆固含量降低导致混合料中的含钒粒子平均尺寸和最大尺寸均逐渐减少,平均尺寸从1.085μm减至0.523μm,最大尺寸从1.627μm减至0.876μm。料浆固含量降低使合金的钴相均匀性下降,料浆固含量低至57%时,合金中会出现1μm以上的钴池,降低合金的抗弯强度。当料浆固含量为64%时,合金同时具备均匀的WC晶粒和钴相分布,抗弯强度最高,达到2780MPa。因此,合理调控混合料料浆固含量能有效控制合金的综合力学性能。The powder properties,pressing properties,microstructure and properties of WC-8%Co-0.4%VC ultrafine cemented carbide mixture prepared by three groups of slurries with different solid contents were studied.The results show that with the decrease in the solid content of the mixture,the content of fine powder in the mixture increases,and the degree of particle breakage increases.The loose density of the mixture gradually decreases from 3.4 g/cm^(3)to 2.5 g/cm^(3),and the fluidity gradually deteriorates from 32 s to 39 s;the pressing pressure of the mixture PS21 increases from 2250 N to 4050 N,and the green compact strength decreases from 5.52 MPa to 2.88 MPa.The decrease in the solid content of the mixture leads to the gradual decrease in the average size and maximum size of vanadium-containing particles in the mixture,from 1.085μm to 0.523μm and from 1.627μm to 0.876μm,respectively.With the decrease in the solid content of the mixture,the uniformity of the cobalt phase in the alloy gradually decreases.When the solid content is as low as 57%,a cobalt pool of more than 1μm will be formed,which will reduce the bending strength of the alloy.When the solid content is 64%,the alloy has a uniform distribution of WC grains and cobalt phase at the same time,and the bending strength is the highest,reaching 2780 MPa.Therefore,adjusting the solid content of the mixture reasonably can effectively control the comprehensive mechanical properties of the alloy.

关 键 词：混合料 超细硬质合金 松装密度 钴相均匀性 抗弯强度 

分 类 号：TG135.5[一般工业技术—材料科学与工程]