氟化锂包覆锡纳米颗粒的熔化

发布时间：2018-03-25 15:25

本文选题：熔化　切入点：尺寸效应　出处：《兰州大学》2015年硕士论文

【摘要】：金属纳米颗粒的熔化,从应用和研究角度,都有着重要的研究意义。但是长期以来制样方法单一,实验数据有限,限制了该课题的深入研究。最近本实验室利用氧化物包覆金属纳米颗粒体系,成功突破了已有样品制备方法的限制,实现了SiO2包覆的Fe和Cu纳米颗粒的熔化研究。不过,进一步的研究表明,该方法不能很好的适用于低熔点金属Sn。在上述工作基础上,本论文探索了几种不同基体对Sn纳米颗粒进行包覆并用于熔化研究的可能性：(1)不论采用机械化学合成法还是直接球磨法,使用常用的氧化物Al2O3和SiO2作为基体,Sn纳米颗粒的最终平均晶粒尺寸均在100nm以上；(2)考虑到两种原料之间的相互作用,换用硬度较低的ZnO作为基体,Sn纳米颗粒的最终平均晶粒尺寸约为55nm；(3)换用硬度更低的LiF作为基体,Sn纳米颗粒的最终平均晶粒尺寸约为15nm。上述结果表明：在相同球磨条件下,金属与隔离相的硬度越匹配,所得金属纳米颗粒的最终尺寸越小。进一步,将所得LiF包覆Sn纳米颗粒的熔化数据与文献数据对比表明,不同基体(LiF和Al)对Sn纳米颗粒熔化的影响不明显。
[Abstract]:The melting of metal nanoparticles is of great significance in both application and research. However, for a long time, the method of sample preparation has been single, and the experimental data are limited. Recently, the oxide coated metal nanoparticles system has been used in our laboratory, which has successfully broken through the existing methods of sample preparation and realized the melting of Fe and Cu nanoparticles coated by SiO2. Further research shows that this method is not suitable for low melting point metal Sn. on the basis of the above work, In this paper, the possibility of coating Sn nanoparticles with different substrates and using them for melting study was explored. (1) either by mechanochemical synthesis or by direct ball milling, The final average grain size of Sn nanoparticles using oxide Al2O3 and SiO2 as substrates is above 100nm.) the interaction between the two raw materials is taken into account. The final average grain size of ZnO nanoparticles with lower hardness is about 55 nm. The final average grain size of LiF nanoparticles with lower hardness is about 15 nm. The results show that under the same ball milling condition, the final average grain size is about 15 nm. The smaller the final size of the metal nanoparticles is, the more the hardness of the metal is matched with the isolated phase. Further, the melting data of the Sn nanoparticles coated with LiF are compared with the literature data. The effect of different matrix lif and Al on the melting of Sn nanoparticles is not obvious.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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