【摘要】 金属Fe纳米粒子,易氧化和团聚,将其嵌入陶瓷基体中,可解决这个问题。本文以Al和Fe3O4为反应物,采用机械力化学法合成了纳米铁/氧化铝复合粉体。利用X射线衍射(XRD),结合透射电镜(TEM)分析了复合粉体的物相组成及纳米Fe的粒径。运用示差扫描量热法(DSC)、热重(TG)研究了在氩气和空气不同气氛、室温和高温不同温度下复合粉体的热稳定性。结果表明:复合粉体具有蛋糕-果仁形态,纳米Fe的粒径在20~80nm之间;复合粉体具有良好的抗氧化性。更多还原

【Abstract】 Metal nanoparticles embedded in an insulating host have also received attention,because embedding can provide encapsulation and prevent oxidation and agglomeration.Nano-Fe/Al2O3 composite powders were prepared by mechanochemical method,using Al and Fe3O4 as starting materials.X-ray diffractometer(XRD) and transmission electron microscopy(TEM) was employed to examine the microstructure of the composite powders.Differential scanning calorimeter(DSC) and thermogravimeter(TG) were used to analyze the oxidation resistance of composite powders under different temperature and different atmosphere,respectively.It was found that composite powders shows currant-bun morphology,with the size of Fe nanoparticle about 20-80nm.The composite powders shows excellent oxidation resistance,due to the embedding.更多还原