【摘要】：金屬納米顆粒的熔點(diǎn)隨其顆粒尺寸的變化而變化,其熱穩(wěn)定性及熔化會(huì)影響材料的使役行為,是材料選取和工藝設(shè)計(jì)等諸多環(huán)節(jié)的重要參數(shù),因此研究金屬納米顆粒的熔化行為具有重要意義。一直以來,在對(duì)金屬納米顆粒的熔化行為進(jìn)行更多研究時(shí),由于受到樣品制備方法的影響,所得實(shí)驗(yàn)數(shù)據(jù)有限,限制了該課題的進(jìn)一步發(fā)展。本實(shí)驗(yàn)室已經(jīng)對(duì)金屬納米顆粒的熔點(diǎn)進(jìn)行了深入研究,突破了以往的體系。通過機(jī)械球磨法研究了SiO2包覆的Fe和Cu納米顆粒的熔化現(xiàn)象,以及LiF包覆的Sn納米顆粒的熔化現(xiàn)象。在上述研究基礎(chǔ)上,本文利用機(jī)械球磨法制備不同基體包覆的Zn納米顆粒,并探究其熔化現(xiàn)象:(1)通過機(jī)械球磨法制備Al2O3包覆的Zn納米顆粒以及LiF包覆的Zn納米顆粒,所得的Zn納米顆粒的顆粒尺寸分布集中。(2)制備所得的Al2O3包覆的Zn納米顆粒其顆粒尺寸最小為23 nm,熱分析表明其熔點(diǎn)是403℃,相對(duì)于體相熔點(diǎn)下降了17℃。而LiF包覆的Zn納米顆粒顆粒尺寸最小為16 nm,熱分析表明其熔點(diǎn)是398℃,相對(duì)于體相熔點(diǎn)下降了22℃。Zn納米顆粒的熔點(diǎn)下降值與理論計(jì)算值相符合。同時(shí)本文采用機(jī)械球磨法制備不同基體包覆的Ag納米顆粒,探究Ag納米顆粒的熔化現(xiàn)象。采用機(jī)械化學(xué)合成法制備C包覆的Ag納米顆粒時(shí),發(fā)現(xiàn)Ag納米顆粒尺寸為19 nm,熱分析表明其熔點(diǎn)為945℃,相對(duì)于體相熔點(diǎn)下降了17℃,與理論計(jì)算值相符合,豐富了實(shí)驗(yàn)數(shù)據(jù)。
[Abstract]:The melting point of metal nanoparticles varies with the change of particle size. Its thermal stability and melting will affect the causative behavior of the material, which is an important parameter in material selection and process design. Therefore, it is of great significance to study the melting behavior of metal nanoparticles. For a long time, due to the influence of the method of sample preparation, the experimental data are limited, which limits the further development of the subject when more research on the melting behavior of metal nanoparticles is carried out. The melting point of metal nanoparticles has been studied in our laboratory, breaking through the previous system. The melting phenomena of SiO2 coated Fe and Cu nanoparticles and LiF coated Sn nanoparticles were studied by mechanical ball milling. On the basis of the above research, Zn nanoparticles coated with different substrates were prepared by mechanical ball milling and their melting phenomena were investigated. (1) Al2O3 coated Zn nanoparticles and LiF coated Zn nanoparticles were prepared by mechanical ball milling. The particle size distribution of the obtained Zn nanoparticles is concentrated. (2) the Al2O3 coated Zn nanoparticles have the smallest particle size of 23 nm, and the melting point is 403 鈩，

本文編號(hào)：2241423