自蔓延高温合成制备钨粉的热力学研究  

A study on the thermodynamic of preparation of tungsten powder by self-propagating high temperature synthesis

作　　者：史冠勇 熊民 陈平 豆志河 SHI Guanyong;XIONG Min;CHEN Ping;DOU Zhihe(College of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China;Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education, School of Metallurgy, Northeastern University, Shenyang 110004, China)

机构地区：[1]江西理工大学材料冶金化学学部,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》2019年第3期12-15,共4页Jiangxi Metallurgy

基　　金：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项目(NEMM2018004);江西省教育厅科学技术研究项目(GJJ180463);江西理工大学科研启动基金项目(jxxjbs17006)

摘　　要：计算了镁热还原自蔓延高温合成金属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:自蔓延高温合成制备金属钨粉在热力学的角度上是可行的,Mg-WO3体系中WO3在273~2350K,2350~3200K和3200K以上分别按照WO3→WO2.9→WO2.72→WO2→W,WO3→WO2.72→WO2→W和WO3→WO2→W的顺序被还原成金属钨粉;体系的绝热温度为3680K,可以维持自蔓延反应,添加稀释剂可以降低其绝热温度,降低绝热温度的能力由大到小依次为碳酸钠>氧化镁>氯化钠;Mg-WO3体系自蔓延高温合成可以制得Dv(50)约为1.39μm的单相金属钨粉.The Gibbs free energy and adiabatic temperature produced in the preparation of metal tungsten powder by magnesiothermic reduction method and self-propagating high-temperature synthetic - were calculated and verified by experiments.The results show that making metal tungsten powder via the self-propagating high-temperature synthesis is feasible from the perspective of thermodynamics,and that in Mg-WO3 system,WO3 is reduced into metal tungsten powder in the order of WO3→WO2.9→WO2.72→WO2→W,WO3→WO2.72→WO2→W and WO3→WO2→W in 273~2 350 K,2 350~3 200 K and above 3 200 K respectively.The adiabatic temperature of the system is 3 680 K,which is enough to maintain the self-propagating reaction,adding diluents can reduce the adiabatic temperature.As a result,the diluents is listed in descending order of capability of reducing the adiabatic temperature :sodium carbonate>magnesium oxide>sodium chloride.Single-phase tungsten powder with Dv(50) of about 1.39 μm can be prepared by self-propagating high temperature synthesis in Mg-WO3 system.

关 键 词：自蔓延冶金 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]