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采用气相二氧化硅处理镧镍铝合金,研究二氧化硅溶胶包裹镧镍铝合金的制备方法。对干燥后的样品进行了SEM分析,研究了水含量、镧镍铝合金含量和合金粒度、干燥工艺对样品吸氢性能的影响。结果发现,绝大多数镧镍铝合金颗粒都能被包裹在二氧化硅胶体内;溶胶的粘度随着水含量的增加、时间的延长逐渐降低;水和二氧化硅的含量控制在8:1时,样品的吸氢速度较快;镧镍铝合金含量越低,样品中单位质量的金属吸氢量越高;合金粒度越小,合金颗粒越容易被胶体包裹住,样品的吸氢性能也相对越好;另外,样品干燥过程中并不一定需要有惰性气体保护。在0.2MPa氢压下,样品的吸氢量和吸氢速度都明显优于LaNi4.8Al0.2合金。
The lanthanum-nickel-aluminum alloy was treated with fumed silica to study the preparation of lanthanum-nickel-aluminum alloy coated with silica sol. The dried samples were analyzed by SEM. The effects of water content, lanthanum-nickel-aluminum alloy content, alloy grain size and drying process on the hydrogen absorption properties of the samples were studied. The results showed that the majority of lanthanum-nickel-aluminum alloy particles can be encapsulated in colloidal silica; the viscosity of the sol gradually decreases as the water content increases; the content of water and silica is controlled at 8: 1 , The hydrogen absorption rate of the sample is faster; the lower the content of lanthanum-nickel-aluminum alloy is, the higher the hydrogen absorption per unit mass of the metal in the sample; the smaller the alloy particle size is, the easier the alloy particles are surrounded by the colloid, The better; In addition, the sample drying process does not necessarily need to have inert gas protection. At 0.2MPa hydrogen pressure, the hydrogen absorption rate and hydrogen absorption rate of the samples are obviously better than LaNi4.8Al0.2 alloy.