采用XRD、TEM等手段对利用沉淀法制备的纳米CeO_2粉体结构特征和形貌进行了表征,并考察了焙烧温度对纳米CeO_2颗粒体形貌及对500SN基础油摩擦性能的影响.结果表明:焙烧温度低于400℃制备的纳米CeO_2粉体能降低500SN基础油的摩擦因数;而高于600℃焙烧的纳米CeO_2粉体将会增大其摩擦因数和磨斑直径;焙烧温度越高,纳米CeO_2颗粒的晶体结构越完整,且颗粒由近球形变为不规则的多面体,存在着尖锐的边角,导致了摩擦性能的降低;焙烧温度较低时,颗粒表面非晶成分的存在有利于提高基础油的摩擦性能.
Ceria nanoparticles were prepared by precipitation method.The structural feature and morphology were characterized by XRD and TEM.The effect of calcination temperature on the morphology and 500SN base oil tribological properties of the CeO_2 nanoparticles was investigated.The results show that the ceria nanoparticles calcined at temperature below 400 ℃ could reduce the friction coefficient and improve the tribological properties of 500SN base oil.However,the ceria nanoparticles calcined at temperature above 600 ℃ could increase the friction coefficient and the wear scar diameter.The higher the calcination temperature,the more integral the crystal structure of the CeO_2 nanoparticles.The particles with sharp comers transformed from nearly spherical into polyhedral,which led to the decrease of the tribological properties.When the calcining temperature was lower,the existence of the amorphous composition on the surface of crystal particles could improve the tribological properties of base oil.
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