Fabrication of Nano-CeO2and Application of Nano-CeO2in Fe Matrix Composites

[摘要] It is expatiated that nano-CeO2is fabricated by the direct sedimentation method. The components and particles diameter of nano-CeO2powders are analyzed by XRD and SEM . The thermodynamic analysis and acting mechanism of nano-CeO2with Al in Fe matrix composites are researched, which shows that the reaction is generated between CeO2and Al in the composite, that is,3CeO2+4Al→2Al2O3+3[Ce], which obtains Al2O3and active [Ce] during the sintering process. The active [Ce] can improve the performance of CeO2/Fe matrix composites. The suitable amount of CeO2is about 0.05% in CeO2/Fe matrix composites. SEM fracture analysis shows that the toughness sockets in nano-CeO2/Fe matrix composites are more than those in no-added nano-CeO2composites, which can explain that adding nano-CeO2into Fe matrix composite, the toughness of the composite is improved significantly. Applied nano-CeO2to Fe matrix diamond saw blades shows that Fe matrix diamond saw blade is sharper and of longercutting life than that withno-added nano-CeO2.

[学科分类] 材料工程