氧化铝粉末表面的快速镍金属化及其磁学性质

Quick Nickel Metallization and Magnetic Properties on the Surface of Alumina Powder

基于溶液/氧化铝界面的自催化氧化-还原反应,实现了金属镍在氧化铝粉末表面上的快速化学沉积,制备了氧化铝颗粒表面包覆镍层的微粉产物。用X射线衍射(XRD)、扫描电子显微镜(SEM)、剖面金相显微分析和傅立叶变换红外光谱(FTIR)综合表征了产物的形貌及结构。镍金属壳层由纳米级大小的晶体镍颗粒组成,厚度为2μm左右。镍包氧化铝产物具有类似于金属镍的导电性和磁学特性,其压片电阻率近似为零;饱和磁化强度(Ms)为39.6A·m2·kg-1,剩余磁化强度(Mr)6.0A·m2·kg-1,矫顽力(Hc)为6336A/m。

Based on the auto - catalytic redox reaction occurring on the solution/alumina interface, quick nickel metallization of alumina powder was carried out by chemical deposition of nickel particles on the surfaces of micro - sized alumina powder. The product with core shell structure, alumina coated with metallic nickel, was characterized by X - ray diffraction (XRD), scanning electron microscopy (SEM), cross - section metallography and Fourier transfer infred spectrometer (FTIR). The analysis results show that alumina can be completely coated by a thin metallic nickel film with 2 mum thickness, which is composed of nano - sized crystalline nickel particles. The product possesses metallic conductivity and magnetic properties similar to nickel. Its sheet electric resistivity is nearly zero, the coercive force (He) is 6 336A/m, the saturated mass magnetization (Ms) is 39.6A (.) m(2)/kg, and the remanent mass magnetization ( Mr) is 6.0A (.) m(2)/kg.