Ni-Mo-B非晶态合金纳米颗粒的抗氧化性能研究

在水溶液体系中用化学还原法制备Ni-B和Ni-Mo-B非晶态合金纳米颗粒.SEM测试表明,样品的颗粒形貌呈球形或类球形,平均粒径约10nm.XPS分析结果表明,Ni-Mo-B非晶态合金中钼元素主要以氧化态形成于合金的表面,并导致合金表面合金化硼原子浓度显著增加,氧化态硼（B3＋）的原子浓度显著减少,氧的原子浓度明显减少,合金化镍的原子浓度显著增加,氧化态镍（Ni3＋）的原子浓度显著减少.因此,Ni-Mo-B合金的抗氧化性能显著高于Ni-B合金.XPS谱图分析还表明,在Ni-B和Ni-Mo-B非晶态合金中,存在Ni和B的合金化物Ni2B,其中B失去部分电子,而Ni则富余电子.Ni2B的氧化产生副产物Ni2O3和B2O3.

Study on Antioxidation of Nanosize Ni-Mo-B Amorphous Alloy

The nanosize Ni B and Ni Mo B amorphous alloy powders were prepared by chemical reduction with KBH4 in aqueous solution .Their amorphous stuctures were determined by XRD .The SEM characterization demonstrates that all samples exhibit a spherical or sphere like morphology with an average size of around 10 nm.The XPS characterization shows that the molybodnum species in the Ni Mo B samples are mainly present on the surface of Ni Mo B alloy in the oxidized form.Compared with Ni B alloy,the surface atomic content of alloying boron and alloying nickel of Ni Mo B alloy shows a considerable increase,the surface atomic content of oxidized boron,oxidized nickel and oxygen of Ni Mo B alloy shows a considerable decrease .Thus,XPS results have proven that the Ni Mo B amorphous alloy exhibits stronger antioxidation ability than the amorphous Ni B alloy.XPS characterization also shows that Ni2B is presented in the Ni B and Ni Mo B samples,and the alloying nickel is electron enriched while the alloying boron is electron deficient.Ni2O3 and B2O3 are byproducts of the Ni2B oxidation.