材料科学
纳米-
粒径
铝
扫描电子显微镜
热重分析
氧化物
熔点
金属
化学工程
纳米颗粒
粒子(生态学)
场发射显微术
冶金
衍射
复合材料
纳米技术
海洋学
物理
光学
地质学
工程类
作者
N. Eisenreich,H. Fietzek,M. Juez‐Lorenzo,V. Kolarik,Volker Weiser,Andreas Koleczko
摘要
The addition of ultra-fine and nano-sized particles in composite materials influences their properties. In order to understand the influence of the nano-size of metal particles on the oxidation behaviour, a series of in situ studies by thermogravimetry (TG) and high temperature X-ray diffraction (XRD) was performed on Al, Fe and Cu during heating with post oxidation analysis by field emission – scanning electron microscope (FE-SEM). The oxidation reaction depends, for all three studied metals, on the particle size both in regard to transient oxide formation and formation temperatures. On a nano-scale Al forms θ-Al2O3 and γ-Al2O3 simultaneously at 500°C, but both of these oxides transform to α-Al2O3 at 975°C producing nano-scaled oxide particles. Aluminium particles with sizes from 2 to 25 μm form α-Al2O3 only, starting at temperatures close to the melting point. Nano-sized Fe forms on heating from 340°C α-Fe2O3 only and no other oxides. On nano-sized Cu particles the formation of Cu2O starts at 140°C, transforming completely to CuO at 300°C.
科研通智能强力驱动
Strongly Powered by AbleSci AI