本文選題：石墨烯　切入點(diǎn)：銀基復(fù)合材料　出處：《西安理工大學(xué)》2017年碩士論文

【摘要】：本文分別采用化學(xué)還原法和水熱法合成了負(fù)載銀石墨烯(Ag-doped graphene)及摻氮石墨烯(N-doped graphene)復(fù)合粉末,并通過粉末冶金法制備了負(fù)載銀石墨烯增強(qiáng)的銀基塊體復(fù)合材料和摻氮石墨烯增強(qiáng)的銀基塊體復(fù)合材料。利用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)和拉曼光譜儀(Raman)及X射線光電子能譜儀(XPS)對(duì)負(fù)載銀石墨烯及摻氮石墨烯復(fù)合粉末進(jìn)行表征。通過光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)、能譜分析(EDS)及透射電子顯微鏡(TEM)對(duì)負(fù)載銀石墨烯增強(qiáng)銀基塊體復(fù)合材料和摻氮石墨烯增強(qiáng)銀基塊體復(fù)合材料的組織進(jìn)行了分析,并對(duì)其密度、硬度和電導(dǎo)率進(jìn)行了測(cè)試。通過以上研究可得到以下結(jié)論。(1)采用水合肼在90℃保溫2h條件下可有效還原氧化石墨烯(GO)和AgN03,并去除了氧化石墨烯中的大量含氧官能團(tuán),銀納米粒子成功地負(fù)載到石墨烯上,阻礙了石墨片層的有序堆疊,有效地重建石墨烯的共軛結(jié)構(gòu)。(2)在160℃保溫6h水熱條件下,摻氮石墨烯被有效的還原,且在石墨烯中成功地引入氮元素,摻氮量為4.74at%。除了局部區(qū)域出現(xiàn)堆疊和褶皺外,合成的摻氮石墨烯由于氮元素在石墨烯晶面內(nèi)的替代導(dǎo)致形貌呈現(xiàn)較大程度的扭曲。(3)負(fù)載銀石墨烯的添加顯著增強(qiáng)了銀基塊體復(fù)合材料的性能。與純銀相比,添加0.5wt%負(fù)載銀石墨烯的銀基塊體復(fù)合材料硬度與電導(dǎo)率分別提高了 55.4%和2.78%。但是過量的負(fù)載銀石墨烯導(dǎo)致銀基塊體復(fù)合材料的硬度和電導(dǎo)率顯著降低。隨著銀粉粒度的增大,銀基塊體復(fù)合材料的硬度降低,而電導(dǎo)率呈現(xiàn)升高的趨勢(shì)。采用100nm銀粒制備的0.5wt%負(fù)載銀石墨烯增強(qiáng)的銀基塊體復(fù)合材料硬度和電導(dǎo)率分別為89.4HV和95.68%IACS。(4)負(fù)載銀石墨烯增強(qiáng)銀基塊體復(fù)合材料的硬度和電導(dǎo)率隨著燒結(jié)溫度的升高先增大后減小。600℃燒結(jié)制備的銀基塊體復(fù)合材料的硬度和電導(dǎo)率均達(dá)到最大,分別為89.4HV 和 95.68%IACS。(5)少量摻氮石墨烯的添加顯著提高了銀基塊體復(fù)合材料的性能。但是過多摻氮石墨烯的添加顯著降低了塊體銀基復(fù)合材料的硬度和電導(dǎo)率。當(dāng)摻氮石墨烯的量為0.1wt%時(shí),銀基塊體復(fù)合材料硬度和電導(dǎo)率與純銀相比分別提高了 64.8%和3.71%。(6)細(xì)小的銀粉有利于摻氮石墨烯增強(qiáng)的銀基塊體復(fù)合材料硬度的提高,但降低了電導(dǎo)率。當(dāng)銀粒徑為100nm時(shí),銀基塊體復(fù)合材料的硬度為94.6HV。采用不同粒徑的銀粉制備的摻氮石墨烯增強(qiáng)的銀基復(fù)合材料的電導(dǎo)率均保持在96%IACS以上。
[Abstract]:In this paper, Ag-doped graphene and N-doped graphene (N-doped graphene) composite powders were synthesized by chemical reduction method and hydrothermal method, respectively.Silver bulk composites reinforced by silver graphene and silver matrix bulk composites reinforced by nitrogen-doped graphene were prepared by powder metallurgy method.The composite powders of silver graphene and nitrogen-doped graphene were characterized by X-ray diffractometer, scanning electron microscope (SEM), transmission electron microscope (TEM), Raman spectrometer (Raman) and X-ray photoelectron spectroscopy (XPS).The microstructure of silver-supported graphene-reinforced silver-based bulk composites and nitrogen-doped graphene-reinforced silver-based bulk composites were analyzed by optical microscope, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM).The density, hardness and electrical conductivity were tested.Through the above study, we can get the following conclusion: 1) under the condition of holding hydrazine hydrate for 2 hours at 90 鈩，

本文編號(hào)：1707070