NiCoB超细非晶合金的化学制备和热稳定性研究

用化学还原法制备了Ni－B、Co－B及不同含量的Ni－Co－B超细非晶态微粒．电感耦合等离子光谱（ICP）测定合金的组成表明：微粒中Ni与Co的含量可通过调节反应溶液中Ni与Co离子浓度来控制．X衍射（XRD）、透射电镜（TEM）及电子衍射证实合金是粒径约为20nm的非晶相球状颗粒．用示差量热法（DSC）考察了制备条件对非晶态合金热稳定性的影响．发现相同组成不同含量及不同条件下制得的样品其热稳定性均有差异．初步解释了引起这种差别的原因．从而揭示了非晶态合金结构的复杂性．

Study on the Chemical Preparation of Ultrafine Amorphous Ni-Co-B Alloy and their Thermal Stability

Ultrafine amorphous particles of Ni-B、Co-B and Ni-Co-B with different contents have been prepared by chemical reduction method. Nickel and cobalt contents in the particles can be easily varied by changing the ionic concentration of the aqueous solution. The XRD、TEM and electron diffractoin results show that the alloy particles are amorphous spheres, whose diameters are about 20 nm. The thermal stability of ultrafine amorphous alloy prepared at different conditions has been investigated by DSC method. It is found that there are differences of thermal stability for amorphous alloy of the same elements with different contents of for amorphous alloy of the same elements prepared at different conditions.