摘要
在金属切削加工中,硬质合金刀具材料在高温下会发生氧化反应,硬度显著下降,严重影响着硬质合金刀具的服役性能。本文采用传统粉末冶金工艺,制备WCCo基硬质合金,研究了钴含量、WC晶粒度、TaC/NbC/TiC添加剂对硬质合金的高温抗氧化性和高温硬度的影响。结果表明:增加钴含量,硬质合金的高温抗氧化性提升,高温硬度显著升高;减小WC晶粒度,硬质合金的高温抗氧化性提升,高温硬度显著降低;与WC-Co硬质合金相比,添加TaC对硬质合金的高温抗氧化性无明显影响,添加NbC会降低硬质合金的高温抗氧化性,而添加TiC可以明显提高硬质合金的高温抗氧化性;添加TaC、NbC、TiC,均能显著提高硬质合金的高温硬度。
In metal cutting,cemented carbide tools will oxidize at high temperatures,and their hardness will decrease significantly,which seriously affects the service performance of the tools.In this paper,WC-Co-based cemented carbides were prepared by the traditional powder metallurgy process.The effects of cobalt content,WC grain size,and TaC/NbC/TiC additives on oxidation resistance and hardness of cemented carbides at high temperatures were studied.The results show that with the increase in cobalt content,the oxidation resistance of cemented carbides at high temperatures increases slightly,and the hardness increases significantly.With the decrease in WC grain size,the oxidation resistance of cemented carbides at high temperatures increases slightly,but the hardness decreases significantly.Compared with WC-Co-based cemented carbides,the addition of TaC has no significant effect on the oxidation resistance of cemented carbides at high temperatures.The addition of NbC reduces the oxidation resistance of cemented carbides at high temperatures,but that of TiC can significantly improve the oxidation resistance of cemented carbides at high temperatures.Moreover,the addition of TaC,NbC,and TiC can significantly improve the hardness of cemented carbides at high temperatures.
作者
罗学全
于涛
瞿峻
温光华
Luo Xuequan;Yu Tao;Qu Jun;Wen Guanghua(Zhuzhou Cemented Carbide Cutting Tools Co.,Ltd.,Zhuzhou Hunan 412007,China;Light Alloy Research Institute,Central South University,Changsha Hunan 410083,China)
出处
《硬质合金》
CAS
2023年第4期263-270,共8页
Cemented Carbides
基金
国家重点研发计划青年科学家项目(2022YFB3708800)。
关键词
硬质合金
成分
高温抗氧化性
高温硬度
cemented carbide
composition
oxidation resistance at high temperature
hardness at high temperature
