Ni纳米粉体的氧化特性和磁性研究  

Study on oxidization resistance and magnetic behavior of Ni nanopowders

作　　者：孙维民[1] 郑卓[1] 徐东年[1] 刘正[2] 董星龙[3] 

机构地区：[1]沈阳工业大学理学院,辽宁沈阳110023 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110023 [3]大连理工大学材料科学与工程学院,辽宁大连116023

出　　处：《材料热处理学报》2007年第5期6-9,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(50371012)

摘　　要：在CH4+H2+Ar的混合气氛下,用电弧放电法蒸发纯Ni制备了Ni纳米粉体,并对粉体进行了分析。结果表明,在CH4+H2+Ar的混合气氛下制备的粉体形貌接近类球形,平均粒度20nm,粒子具有核壳结构,核为Ni,壳为3 nm左右的碳膜。在CH4+H2+Ar气氛下制备的粉体抗氧化性比在H2+Ar气氛下制备的强,饱和磁化强度比在纯CH4气氛下制备的大。Ni nanopowders were prepared by arc discharge evaporating pure Ni in CH4 ＋ H2 ＋ Ar atmosphere. The structure, morphology, surface layer and oxidation resistance as well as magnetic behavior of the particles were studied by X-ray diffraction（XRD）, high-resolution transmission electron microscopy（HRTEM） ,X-ray photoelectron spectroscopy（XPS）, chemical analysis, gas analysis and thermogravimetry analysis as well as vibrating sample magnetometer. The results show that the nanoparticles with mean particle sizes of 20nm form in a core-shell structure, which the core is Ni and the shell is carbon layer with 3nm thickness. The carbon layer prevents the particles from a further oxidation in air. The oxidization resistance of the samples prepared in CH4 ＋ H2 ＋ Ar atmosphere is better than the samples prepared in H2 ＋ Ar atmosphere, and the magnetization of the former is higher than the samples prepared in CH4 atmosphere.

关 键 词：NI 纳米粉体 核壳结构 氧化特性 磁性 

分 类 号：TB34[一般工业技术—材料科学与工程]