摘要
应用动态环境扫描电镜法原位观察纯 Ｆｅ在 ５００－７５０℃，氧分压１０－４－４５Ｐａ下生成不同形貌、结构及组分的铁氧化物晶粒／晶须所组成的氧化层的演化历程，结果表明，在不同的反应条件下生成的氧化锈皮中，不但氧化物组成（ＦｅＯ，Ｆｅ３Ｏ４，Ｆｅ２Ｏ３等）不同，而且氧化物晶粒／晶须有着不同的形貌与微观结构根据６００℃氧化时的实验结果，提出了一个纯 Ｆｅ表面拟立方体Ｆｅ２Ｏ３晶粒生长模型和晶粒在亚纳米到微米尺寸大小范围内的抛物线氧化反应速率方程．
A technique of dynamic environmental scanning electron microscope (DESEM) was used to observe and record continuously microstructure changes during oxidation of iron under the temperature range of 500-750℃ and the oxygen partial pressure range of 10-4-45 Pa. A set of micrographs shows the evolution of nucleation and growth of oxide grains on the surface of pure iron specimens at 600℃ and the programmed partial pressure of oxygen in the ESEM. Based on the experimental results, a growth model of pseudo cubic grains of Fe2O3 and a modified parabolic equation for the growth rate of iron oxide were proposed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第3期230-234,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目!59474013
关键词
环境扫描电镜
抛物线方程
纯铁
表面氧化
dynamic environmental electron scanning microscope, oxidation on iron surface, parabolic equation for growth rate
