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报道了一种简单的通过溶胶-凝胶结合氢气还原制备Ni/SiO2核壳纳米复合颗粒,然后以乙炔为碳源通过在适当温度下裂解乙炔制备碳包裹Ni/SiO2核壳纳米复合颗粒的方法.结果表明,频率直到1GHz所得样品的复合磁导率的实部μ′几乎保持不变,而虚部μ″一直保持在很小的值.本方法提供了一种有效的获得具有好的软磁性能的软磁复合物的方法,尤其是在高频范围.它的物理机制为:由于Ni核之间的非晶氧化硅壳层的绝缘作用,导致了样品的电阻增加,减少了高频阶段的涡流损耗作用,使得复合物的复合磁导率的实部μ′几乎保持不变,而虚部μ″一直保持在很小的值.抗酸性研究表明,通过表面包裹碳,Ni/SiO2核壳纳米复合颗粒的抗酸性大为提高.
Reported a simple method for preparing carbon coated Ni / SiO2 core-shell nano-composite particles by sol-gel combined with hydrogen reduction and then acetylene as a carbon source by cracking acetylene at a suitable temperature The results show that the real part μ ’of the composite permeability at frequencies up to 1 GHz remains almost constant while the imaginary part μ “remains at a very low value.This method provides an effective way to obtain a good soft Magnetic properties of the soft magnetic composite method, especially in the high frequency range of its physical mechanism is: due to the insulation between the amorphous silicon oxide shell Ni core, resulting in increased resistance of the sample, reducing the high frequency The eddy current loss of the phase makes the real part μ ’of the complex permeability remain almost unchanged, while the imaginary part μ ”remains at a very small value.Anti-acid resistance studies show that the surface permeability of Ni / SiO2 The core-shell nano-composite particles greatly improved the acid resistance.