【摘要】 采用化学镀镍的方法制备Ni/B微纳米复合粒子。运用TEM、EDS和XRD方法对复合粒子的形貌、组成和物相进行表征,并通过TG-DTA热分析仪和热常数分析仪研究Ni/B微纳米复合粒子的热稳定性和导热系数。结果表明,真空干燥得到的复合粒子为核壳结构,纳米镍的尺寸约为21.7 nm,纳米镍粒子紧密均匀地包裹在硼粉表面,并且镍和硼的质量比为1:1;与原料硼粉相比,复合粒子与空气的反应放热峰提前36℃左右,表明纳米镍粒子具有明显的催化效果;同时,复合粒子的导热系数也有所增大。更多还原

【Abstract】 The synthesis of Ni/B micro-nano composite particles was studied by diamine hydrate reducing nickel chloride in the water bath at 50℃ in which nano-Ni was made to cover the surface of micron boron particles. The sample was characterized by TEM, EDS, XRD, TG-DTA and thermal conductivity instrument. The results show that this method can prepare a compact coating for Ni/B composite particles. The nano-Ni particles coated on boron particles are uniform and continuous, and the mass ratio of Ni and boron is 1:1. The average diameter of Ni crystallites is about 21.7 nm. Compared with boron powder, the high temperature of exothermic peak of Ni/B micro-nano composite particles is decreased by about 36 ℃. The thermal chemistry behavior of the as-prepared composite particles is better than the superfine boron powder, and the thermal conductivity of Ni/B micro-nano composite particles is higher than that of the boron powder.更多还原