铁纳米颗粒的热行为及热稳定性  

Thermal behavior and stability of iron nano - particles

作　　者：柳刚[1] 秦伯雄[1] 郭院波[1] 范荣焕[1] 吕楠[1] 

机构地区：[1]天津大学材料学院,天津300072

出　　处：《兵器材料科学与工程》2003年第4期18-22,共5页Ordnance Material Science and Engineering

基　　金：天津大学-南开大学共建基金;天津市自然科学基金(013603611)

摘　　要：采用梯级加热的方法对铁纳米颗粒进行了处理。根据透射电镜(TEM)和X射线衍射(XRD)的表征结果,在时间上反演了铁纳米颗粒的被加热过程,同时对铁纳米颗粒的热行为和热稳定性进行了分析。研究结果表明,实验所用的铁纳米颗粒具有突变型的氧化行为特征,其在大气中的氧化转变临界温度在523K左右,此温度以下该种铁纳米颗粒能够保持成分及性质稳定,可以安全使用。Thermal behavior and stability are two main properties which definitely have deep influence on the applications of nano- metal particles in almost every case. So, It is necessary and important to make them clear firstly. In this paper, as one kind of the most typical nano- metal particles, nano- iron particles have been selected as the experiment subject and been heated to different temperatures in a step - up heating experiment. After that, the samples are cbserved and tested by TEM and XRD. According to the results, the developing behaviors of nano- iron particles while being heated have been fully described and analyzed time- backwardly, thereby, the property of their thermal stability has been assured too. This kind of Iron particles enjoys an abrupt rather than a gradual oxidization property while being heated in the open air. The critical temperature is around 523K, only above which the profile, composition, structure and other properties of nano- iron particles being studied start their way to change. Therefore, this kind of iron nano - particles can be safely used in case that the serving temperature is not above 532K. This conclusion is quite useful for the oncoming applications and can also be a useful reference for other kinds of nano - metal particles as well.

关 键 词：铁纳米颗粒 热稳定性 氧化 透射电镜 X射线衍射 

分 类 号：TB383[一般工业技术—材料科学与工程]