真空铝热还原法制备金属钛及钛合金的研究  

Preliminary Study on Production of Ti and Ti-Alloys by Vacuum Aluminothermic Reduction

作　　者：赵坤[1] 王耀武[1] 彭建平[1] 狄跃忠[1] 冯乃祥[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819

出　　处：《真空科学与技术学报》2015年第11期1320-1324,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：通过热力学计算得出,Na_2TiF_6被Al还原的化学反应自由能,并通过电位差计法测量真空铝热还原氟钛酸钠和氟化钠的混合物过程的反应临界温度。结果表明该过程在600℃即可发生。真空还原产物经X射线衍射、扫描电镜及X射线荧光谱分析后可知,改变实验原料中Al粉添加量,直接影响还原产物成分及形貌,且副产物为铝电解工业重要原料——Na_3AlF_6。真空条件下,还原产物金属钛及钛合金可与另一产物——Na_3AlF_6达到彻底分离。The reduction of Na2TiF6 with M in vacuum was mathematically modeled, theoretically calculated in ther- modynamics, and experimentally evaluated. The influence of the reduction conditions, including but not limited to the re- duction temperature,mole ratio of Na2 TiF6, M and NaF powders, and pressure, on the contents of the Ti-alloy and by- product was investigated by calculating the Gibbs free-energy,and by measurement with X-ray diffraction,scanning elec- tron microscopy and X-ray fluorescence spectroscopy （XRF）. The preliminary results show that it is feasible to produce Ti and Ti-M alloy on industrial scale by vacuum aluminothennic reduction of Na2 TiF6 at 600℃. In addition,we found that in vacuum,the Ti and Ti-M alloys can be completely separated from the main by-product Na3 MF6,one of the major raw materials in M electrolysis industry.

关 键 词：真空 铝热还原 金属钛 钛合金 钠冰晶石 

分 类 号：TF124.51[冶金工程—粉末冶金] TF823[冶金工程—冶金物理化学]