自蔓延高温合成制备碳化钨粉的热力学研究  

A thermodynamic study on the self-propagating high temperature synthesis of WC powder

作　　者：全温灿 艾志龙 吴彤[1] 史冠勇 豆志河 QUAN Wencan;AI Zhilong;WU Tong;SHI Guanyong;DOU Zhihe(Institute of Green Metallurgy and Process Intensification,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,School of Metallurgy,Northeastern University,Shenyang 110004,China)

机构地区：[1]江西理工大学绿色冶金与过程强化研究所,江西赣州341000 [2]东北大学冶金学院多金属共生矿生态化冶金教育部重点实验室,沈阳110004

出　　处：《江西冶金》2022年第2期13-17,共5页Jiangxi Metallurgy

基　　金：江西省教育厅科学技术研究资助项目(GJJ180463);东北大学多金属共生矿生态化冶金教育部重点实验室开放基金资助项目(NEMM2018004);江西理工大学博士科研启动基金资助项目(jxxjbs17006)。

摘　　要：计算了镁热还原自蔓延高温合成(SHS)碳化钨粉的吉布斯自由能和绝热温度,并进行了实验验证,结果显示:镁热还原制备碳化钨粉在热力学上完全可行,体系的绝热温度为3625.5 K,自蔓延过程可以自发维持,但需要加入稀释剂减缓反应速度;碳酸钠、氯化钠和氧化镁都可以降低体系的绝热温度,其中碳酸钠降低体系绝热温度的效果最好;在加入量较少时,氧化镁的降温效果高于氯化钠,而在添加量增加到体系绝热温度低于2600 K时,氧化镁的降温效果低于氯化钠。验证实验结果显示,在Mg-WO_(3)-C体系下,通过自蔓延高温合成法可以制得单相碳化钨粉。In this paper,The Gibbs free energy and adiabatic temperature of Self-propagating High Temperature Synthesis(SHS)of WC powder by magnesium thermal reduction are calculated.The results show that the preparation of WC powder by magnesium thermal reduction is completely feasible in thermodynamics.The adiabatic temperature of the system is 3625.5 K,which is enough to maintain the self-propagating reaction and needs to add diluent to slow down the reaction speed.Sodium carbonate,sodium chloride and magnesium oxide can all reduce the adiabatic temperature of the system,of which sodium carbonate has the best effect of reducing the adiabatic temperature of the system;when the addition amount is small,the ability of magnesium oxide to reduce the adiabatic temperature of the system is higher than that of sodium chloride,and when the addition amount increases until the adiabatic temperature of the system is lower than 2600 K,the ability of magnesium oxide to reduce the adiabatic temperature of the system is in turn lower than that of sodium chloride.The results show that single-phase tungsten carbide powder can be prepared by self-propagating high-temperature synthesis in Mg-WO_(3)-C system.

关 键 词：自蔓延冶金 碳化钨粉 热力学 吉布斯自由能 绝热温度 

分 类 号：TF777.1[冶金工程—钢铁冶金]