摘要
集成热力学计算和关键实验研究烧结温度对WC-10%Co-Cr_(3)C_(2)-VC超细硬质合金结构和性能的影响,基于平衡相图及固态黏结相完全消失温度设计合金成分和烧结工艺。结果表明:采用相图计算设计碳含量及烧结温度,合金微观结构中未出现有害相并且合金致密度都在99%以上,说明基于多组元硬质合金热力学数据库进行相图计算设计合金是可靠的;其次,同种合金成分下,烧结温度高于固态黏结相完全消失温度60℃时,合金的力学性能及可靠性最优,说明合理的调整烧结温度可减少合金中微型缺陷。
The effect of sintering temperature on the structure and properties of WC-10% Co-Cr_(3)C_(2)-VC ultrafine cemented carbides was investigated by the integration of thermodynamic calculations and key experiments. The alloy composition and sintering process were designed on the basis of the equilibrium phase diagram and the temperature at which the solid-state binder phase completely disappears. The results show that when the carbon content and sintering temperature are calculated by the phase diagram, no harmful phase appears in the alloy microstructure, and the alloy density is above 99%. This indicates that the phase diagram calculation and design of the alloy based on the thermodynamic database of multi-component cemented carbides is reliable. Under the same alloy composition, when the sintering temperature is 60 ℃ higher than the temperature at which the solid-state binder phase completely disappears, the mechanical properties and reliability of the alloy are optimal. This indicates that the micro-defects in the alloy can be reduced by reasonable adjustment to the sintering temperature.
作者
田海霞
杜勇
张迎晖
徐国钻
Tian Haixia;Du Yong;Zhang Yinghui;Xu Guozuan(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou Jiangxi 341000,China;Powder Metallurgy Research Institute,Central South University,Changsha Hunan 410000,China;Research and Development Department,Chongyi Zhangyuan Tungsten Co.,Ltd.,Ganzhou Jiangxi 341000,China)
出处
《硬质合金》
CAS
2022年第6期446-453,共8页
Cemented Carbides
基金
江西省自然科学基金项目《基于热力学集成计算超细硬质合金成分和烧结工艺的理论设计及实验研究》资助(20202BABL214005)。
关键词
超细硬质合金
热力学计算
烧结温度
力学性能
可靠性
ultrafine cemented carbide
thermodynamic calculation
sintering temperature
mechanical properties
reliability
