本文選題：熔化　切入點(diǎn)：尺寸效應(yīng)　出處：《蘭州大學(xué)》2015年碩士論文

【摘要】：金屬納米顆粒的熔化,從應(yīng)用和研究角度,都有著重要的研究意義。但是長(zhǎng)期以來(lái)制樣方法單一,實(shí)驗(yàn)數(shù)據(jù)有限,限制了該課題的深入研究。最近本實(shí)驗(yàn)室利用氧化物包覆金屬納米顆粒體系,成功突破了已有樣品制備方法的限制,實(shí)現(xiàn)了SiO2包覆的Fe和Cu納米顆粒的熔化研究。不過(guò),進(jìn)一步的研究表明,該方法不能很好的適用于低熔點(diǎn)金屬Sn。在上述工作基礎(chǔ)上,本論文探索了幾種不同基體對(duì)Sn納米顆粒進(jìn)行包覆并用于熔化研究的可能性：(1)不論采用機(jī)械化學(xué)合成法還是直接球磨法,使用常用的氧化物Al2O3和SiO2作為基體,Sn納米顆粒的最終平均晶粒尺寸均在100nm以上；(2)考慮到兩種原料之間的相互作用,換用硬度較低的ZnO作為基體,Sn納米顆粒的最終平均晶粒尺寸約為55nm；(3)換用硬度更低的LiF作為基體,Sn納米顆粒的最終平均晶粒尺寸約為15nm。上述結(jié)果表明：在相同球磨條件下,金屬與隔離相的硬度越匹配,所得金屬納米顆粒的最終尺寸越小。進(jìn)一步,將所得LiF包覆Sn納米顆粒的熔化數(shù)據(jù)與文獻(xiàn)數(shù)據(jù)對(duì)比表明,不同基體(LiF和Al)對(duì)Sn納米顆粒熔化的影響不明顯。
[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.
【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 杜松濤,熊貴光;復(fù)合金屬納米顆粒多孔硅的光學(xué)非線性特性[J];武漢大學(xué)學(xué)報(bào)(理學(xué)版);2003年05期

2 何武強(qiáng),何寶林,陳益賢,廖小娟,劉漢范;溶劑穩(wěn)定的鈀金屬納米顆粒的制備[J];中南民族大學(xué)學(xué)報(bào)(自然科學(xué)版);2004年04期

3 杜天倫;楊修春;黃文e，

本文編號(hào)：1663719