初始压力对气相爆轰合成纳米二氧化钛纳米颗粒的影响  

Influence of Initial Pressure on the Nano-TiO_2 Particles Synthesized by Gaseous Detonation

作　　者：李晓杰[1] 欧阳欣[1] 闫鸿浩[1] 罗宁[1] 莫非[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116023

出　　处：《稀有金属材料与工程》2011年第S2期11-14,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(10172025;10572043);国家青年自然科学基金(10602013);辽宁省自然科学基金(20042161)

摘　　要：介绍了利用氢氧混合气体、四氯化钛组成的多元气相系统,爆轰制备纳米二氧化钛粉体的方法。利用XRD分析证明产物为二氧化钛混晶(金红石相和锐钛矿相),晶粒尺度为纳米级。通过XRD、TEM分析可以得出,粒子形状不规则,粒度为20~100nm。研究发现,随着初始压力的增大,金红石相含量增加,纳米颗粒的平均粒度增大,其原因是反应放热的增加和湍流的加强。最后初步探讨了气相爆轰合成纳米二氧化钛粉末的生成机制。The paper introduced a multi-gaseous system used for preparing nano-TiO2 powders in gas phase, which consists of titanium tetrachloride, O2 and H2 . Properties of TiO2 ultrafine particles were studied by means of XRD and TEM. The results show that the powders whose shapes are irregular are a mixed crystal of rutile and anatase, and the crystalline size of particles is between 20 nm to 100 nm. It is found that the size of TiO2 crystallite is increased and the ctystalline phase transforms from anatase to rutile with the rise of intial pressure, which are caused by the incease of reaction heat and turbulent flow. At last, the the basic principle of preparing TiO2 nanoparticles by multi-gaseous detonation was discussed.

关 键 词：气相爆轰 晶粒尺度 晶相合成 

分 类 号：TB383.1[一般工业技术—材料科学与工程]