WC粉末特性对超细晶硬质合金烧结敏感性影响的研究  

The Influence of the Characteristics of WC Powders on Sintering Sensitivity of Ultrafine-grained Cemented Carbides

作　　者：张璐[1,2] 李剑峰[1,2] 尹运春 刘渊溢 陆必志 Zhang Lu;Li Jianfeng;Yin Yunchun;Liu Yuanyi;Lu Bizhi(State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China;Zhuzhou Cemented Carbide Group Corp.Ltd.,Zhuzhou Hunan 412000,China)

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

出　　处：《硬质合金》2020年第1期51-59,共9页Cemented Carbides

基　　金：长株潭国家自主创新示范区专项《亚微米级解团聚碳化钨粉及超细硬质合金制备技术的研究》(2017XK2205)。

摘　　要：选取3种不同厂家生产的08型WC粉作为原料,以相同的工艺路线制备WC-6%Co硬质合金样品。通过对WC原料粉末杂质含量、粒度、物相、显微形貌、晶粒尺寸和晶格参数详细分析以及不同温度烧结后合金显微组织、WC晶粒夹粗数量和WC平均晶粒度表征,探究WC粉末特性对合金烧结敏感性的影响。研究结果表明,采用颗粒尺寸分布均匀集中、亚晶尺寸大,结晶性完整以及晶格常数与标准值差异较小的WC-C粉末作为原料可以有效的降低合金的烧结敏感性。当烧结温度从1 410℃升高到1 450℃,WC-C制备的合金中WC晶粒夹粗数量增幅较小,且WC平均晶粒度无明显变化维持在0.48μm,同时WC碳含量在6.17%~6.21%波动时,对合金中的WC晶粒夹粗影响亦相对较小。The WC-6%Co cemented carbide samples were prepared by the same process with type 08 WC powder produced by three different manufacturers as raw materials.Based on the detailed analysis of impurity content,particle size,phase composition,micro-morphology,grain size and lattice parameters of the raw powder,and characterization of the microstructure,number of abnormal growth WC grains and mean WC grain size of the alloys at different sintering temperatures,the influence of the characteristics of WC powders on the sintering sensitivity of the alloys was studied.The results show that by using WC-C powder with uniform particle size distribution,large grain size,complete crystallinity and small difference between lattice constant and its standard value as raw materials,it can effectively reduce the sintering sensitivity of the alloy.When the sintering temperature increases from 1 410℃ to 1 450℃the amount of abnormal growth WC grains in the alloy produced by WC-C powder has a small increase and the mean WC grain size has no obvious change,which is maintained at 0.48 μm.At the same time,when carbon content of WC fluctuates from 6.17% to 6.21%,its influence on the amount of abnormal growth WC in the alloys is relatively small.

关 键 词：WC粉 烧结敏感性 粒度分布 亚晶尺寸 晶格常数 显微组织 

分 类 号：TG135.5[一般工业技术—材料科学与工程]