NbC抑制剂研发现状与展望  

Current Status and Prospects of NbC Inhibitor

作　　者：伍文辉[1,2] 尹超[1,2] 傅上 Wu Wenhui;Yin Chao;Fu Shang(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》2022年第4期295-306,共12页Cemented Carbides

基　　金：湖南省创新型省份建设专项项目《高性能PCB微钻钻咀硬质合金材料制备技术》(2020JJ6010);中国五矿集团有限公司科技专项计划项目《PCB微钻用高均匀性硬质合金棒材制备技术》;湖南省高新技术产业科技创新引领计划(2021-2022年)项目《CVD金刚石涂层-硬质合金匹配性研究及其在现代切削加工中的应用》(2022GK4036)。

摘　　要：为获取硬质合金的优异综合性能,添加抑制剂控制WC晶粒尺寸是一种有效途径。本文围绕NbC在WC-Co的添加展开文献调研,总结了NbC抑制机理和WC-Co微结构演化的最新研究进展,分别从微观组织和力学性能(硬度、冲击韧性、断裂行为和切削服役性能)两大维度开展了分析。NbC的抑制机理是与WC在烧结过程中形成(W,Nb)Cx,阻碍WC的溶解-再析出,并在WC界面上存在偏析,阻碍WC迁移过程,抑制WC异常长大。NbC的质量分数不超过1.0%时,能够改善WC-Co硬质合金中WC晶粒的异常长大,得到分布均匀的WC形态,从而可以获得较好的硬度、断裂韧性和实际服役性能。未来开展含NbC的硬质合金研究应考虑结合原子尺度原位实时观察、高通量计算和数值模拟等方法,将进一步加快新型含NbC超细硬质合金的研发进程。In order to obtain the excellent comprehensive properties of cemented carbides, inhibitors can be added to control the grain size of WC, which is an effective way. This paper carried out a literature survey on the addition of NbC to WCCo and summarized the latest research progress on the NbC inhibition mechanism and WC-Co microstructure evolution.Furthermore, the paper analyzed two dimensions including microstructure and mechanical properties(hardness, impact toughness, fracture behavior, and cutting service performance). The NbC inhibition mechanism is as follows: NbC and WC form(W, Nb)Cx during the sintering process, which hinders the dissolution-reprecipitation of WC, and there is segregation at WC interfaces, which impedes the migration process of WC and inhibits the abnormal growth of WC. When the mass fraction of NbC does not exceed 1.0%, the abnormal growth of WC grains in WC-Co cemented carbide can be alleviated, and a uniformly distributed WC morphology can be obtained. As a result, better hardness, fracture toughness, and actual service performance can be realized. Following research on cemented carbides with NbC shall combine atomic-scale in-situ real-time observation, high-throughput calculation, and numerical simulation methods, so as to accelerate the research process of new ultrafine cemented carbides with NbC.

关 键 词：超细硬质合金 晶粒长大抑制剂 NBC 

分 类 号：TG135.5[一般工业技术—材料科学与工程]