碳热还原法合成硼化钛.pdf

万文娇等:Ca3Sc2Si3O12:Ce3+,Nd3+近红外荧光粉的制备和发光性质· 1867 ·第38卷第10期碳热还原法合成硼化钛马爱琼1,蒋明学1,王臻2(1. 西安建筑科技大学材料科学与工程学院,西安 710055;2. 西安秦翔科技公司,西安 710055) 摘要:以金红石型TiO、石墨和BO为原料,采用碳热还原法合成了TiB粉末。借助X射线衍射、扫描电子显微镜和透射电子显微镜等分析手段,研究了工艺条件对合成TiB的影响。结果表明:合成温度、球磨时间、保温时间、合成气氛是影响TiB合成的主要因素。随着合成反应温度升高,TiO的碳热还原顺序依次为:TiO→TiO→TiO→TiO→TiO→TiO。TiB的生成反应温度开始于1300℃左右。真空下合成TiB的最佳工艺条件为:球磨时间为24h,合成温度为1450℃,保温时间为3h。合成TiB粉末的纯度达到98%,晶粒发育完整,平均粒径为2~3μm。关键词:硼化钛;碳热还原法;工艺条件中图分类号:TQ174 文献标志码:A 文章编号:0454–5648(2010)10–1867–05 SYNTHESIS OF TITANIUM DIBORIDE BY CARBONTHERMAL REDUCTION METHOD MA Aiqiong1,JIANG Mingxue1,WANG Zhen2(1. School of Material Science and Engineering, Xi’an University of Architecture & Technology, Xi’an 710055; 2. Xi’an QinXiang pany, Xi’an 710055, China) Abstract: Titanium diboride was synthesized by the carbonthermal reduction method using TiO2 (rutile), graphite and B2O3 as the raw materials. The effects of synthesizing process condition on titanium diboride were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and other analytical tools. The results indicate that the synthesizing temperature, ball milling time, heat preservation time and synthesizing atmosphere are the main factors to affect titanium diboride synthesis. As the synthetic reaction temperature rising, the subsequence of carbonthermal reduction of TiO2 is:TiO2→Ti4O7→ Ti6O11→Ti5O9→Ti3O5→Ti2O