本文選題：碳納米管 + 石墨烯�。� 參考：《青島科技大學(xué)》2015年碩士論文

【摘要】：鋁基復(fù)合材料具有密度低、尺寸穩(wěn)定、比強(qiáng)度高、耐腐蝕性強(qiáng)、高溫性能好等優(yōu)點(diǎn),在各工業(yè)領(lǐng)域具有廣泛應(yīng)用前景,是當(dāng)前金屬基復(fù)合材料研究開發(fā)的重點(diǎn)。隨著航空、航天和汽車制造等現(xiàn)代工業(yè)的發(fā)展,對(duì)材料的性能要求越來越高。傳統(tǒng)的碳纖維、碳化硅鋁基復(fù)合材料將難以滿足現(xiàn)代工業(yè)需求。物理和化學(xué)性能更加優(yōu)異的碳納米管(CNTs)和石墨烯材料有望成為復(fù)合材料的理想增強(qiáng)相；特別在鋁基復(fù)合材料中作為新型增強(qiáng)體有著很好的應(yīng)用前景。本文采用了三種方法來改善碳納米管的分散性,并對(duì)碳納米管進(jìn)行了金屬包覆及在石墨烯的表面包覆金屬銅,均提高了碳納米管和石墨烯與基體的潤(rùn)濕性。采用粉末冶金法制備了金屬基復(fù)合材料,確定了最佳的工藝參數(shù),如球磨時(shí)間、球磨轉(zhuǎn)速,燒結(jié)時(shí)間、燒結(jié)溫度等。利用金相顯微鏡(OM)、掃描電子顯微鏡(SEM)、能譜儀(EDS)、電導(dǎo)率儀和硬度計(jì)等分析手段,對(duì)復(fù)合材料的合成工藝進(jìn)行了研究,實(shí)驗(yàn)結(jié)果表明：1、分別采用化學(xué)鍍、液相還原工藝和分子水分混合法在碳納米管表面包覆鎳(Ni-CNTs)、銀(Ag-CNTs)和銅(Cu-CNTs),獲得了連續(xù)、均勻的包覆層。2、采用機(jī)械球磨法制備了碳鋁基復(fù)合粉末。確定了最佳的球磨工藝參數(shù)：球磨時(shí)間為300 r/min、球磨時(shí)間為1h；采用粉末冶金法制備了復(fù)合材料預(yù)制體,確定了最佳工藝：燒結(jié)溫度為470℃、燒結(jié)時(shí)間為2 h。3、研究了碳納米管(CNTs, Ni-CNTs, Ag-CNTs, Cu-CNTs)含量(0,0.5 wt%,1 wt%,2 wt%)對(duì)復(fù)合材料的組織、力學(xué)性能、導(dǎo)電性能的影響。發(fā)現(xiàn)當(dāng)碳納米管含量為0.5 wt%時(shí),復(fù)合材料的整體性能最佳：復(fù)合材料的硬度值分別提高了9.7%,8.9%,21.4%,電導(dǎo)率下降了4.5%,3.4%,11.3%。4、研究了Cu-石墨烯含量(0,0.5 wt%,1 wt%,2 wt%,4 wt%)對(duì)復(fù)合材料的組織、力學(xué)性能、導(dǎo)電性能的影響。發(fā)現(xiàn)Cu-石墨烯含量為2 wt%時(shí),硬度達(dá)到最大值40.2 HBW,提高了14.9%,電導(dǎo)率下降了17.3%。
[Abstract]:Aluminum matrix composites have the advantages of low density, stable size, high specific strength, strong corrosion resistance and good high temperature performance. It has a wide application prospect in various industrial fields, and is the focus of research and development of metal matrix composites at present. With the development of modern industries, such as aerospace, aerospace and automobile manufacturing, the performance of materials is becoming more and more demanding. Traditional carbon fiber, silicon carbide aluminum matrix composites will be difficult to meet the needs of modern industry. Carbon nanotubes (CNTs) and graphene materials with better physical and chemical properties are expected to be the ideal reinforcements for composites, especially as new reinforcements in aluminum matrix composites. In this paper, three methods were used to improve the dispersion of carbon nanotubes, and the metal coating of carbon nanotubes and metal copper on the surface of graphene were carried out, which improved the wettability of carbon nanotubes and graphene with the matrix. The metal matrix composites were prepared by powder metallurgy, and the optimum process parameters, such as ball milling time, ball milling speed, sintering time and sintering temperature, were determined. By means of metallographic microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), conductivity meter and hardness meter, the synthetic process of the composite was studied. The carbon and aluminum based composite powders were prepared by the liquid phase reduction process and molecular moisture mixing method, which were coated with Ni-Ni-CNTsO, Ag-CNTsand Cu-Cu-CNTsO on the surface of carbon nanotubes. A continuous and uniform coating layer of 0.2 was obtained by mechanical ball milling. The optimum milling process parameters were determined as follows: the milling time was 300 r / min, the milling time was 1 h, the composite preform was prepared by powder metallurgy, and the optimum process was determined as follows: sintering temperature 470 鈩，

本文編號(hào)：1858772