本文選題：導(dǎo)熱復(fù)合材料 + 石墨烯��； 參考：《寧波大學(xué)》2017年碩士論文

【摘要】：導(dǎo)熱復(fù)合材料作為填充于熱源與散熱器之間用于熱傳輸?shù)牟牧?對(duì)電子元器件的正常運(yùn)行和使用壽命有著重要影響,因此具有高熱導(dǎo)率的導(dǎo)熱復(fù)合材料的制備成為導(dǎo)熱領(lǐng)域的重要研究課題。石墨烯的熱導(dǎo)率高達(dá)5300 W/(m·K),是目前已知材料中熱導(dǎo)率最高的,同時(shí)其擁有質(zhì)輕、比表面積高、結(jié)構(gòu)穩(wěn)定、機(jī)械性能好等優(yōu)點(diǎn)成為目前最理想的導(dǎo)熱填料之一。然而,采用傳統(tǒng)共混方法難以實(shí)現(xiàn)石墨烯在高分子基體中的均勻分散,不利于構(gòu)建高效的導(dǎo)熱網(wǎng)絡(luò)。同時(shí),共混方法也難以控制石墨烯導(dǎo)熱網(wǎng)絡(luò)的結(jié)構(gòu),無(wú)法發(fā)揮石墨烯各向異性的導(dǎo)熱特性。針對(duì)上述問(wèn)題,本論文提出了通過(guò)自組裝預(yù)先構(gòu)筑基于石墨烯的三維導(dǎo)熱網(wǎng)絡(luò),以制備具有高熱導(dǎo)率的導(dǎo)熱復(fù)合材料的研究思路。論文的主要研究工作如下:1、通過(guò)乙醇和水混合溶劑揮發(fā)誘導(dǎo)石墨烯自組裝,構(gòu)建石墨烯三維導(dǎo)熱網(wǎng)絡(luò),進(jìn)而通過(guò)樹脂灌注,獲得具有高熱導(dǎo)率的導(dǎo)熱復(fù)合材料。研究了在石墨烯三維組裝體的制備過(guò)程中石墨烯的濃度、混合溶劑中乙醇和水的體積比、揮發(fā)溫度等條件對(duì)三維組裝體結(jié)構(gòu)的影響,以及三維組裝體的微觀結(jié)構(gòu)、密度等對(duì)復(fù)合材料導(dǎo)熱性能的影響。結(jié)果表明,該方法不僅保證了石墨烯良好的分散,而且能夠在一定程度上實(shí)現(xiàn)石墨烯在高分子基體中的定向排列,從而可以獲得具有優(yōu)異導(dǎo)熱性能的石墨烯基導(dǎo)熱復(fù)合材料2、以氧化石墨烯和氮化硼為前驅(qū)體,通過(guò)水熱方式構(gòu)筑石墨烯與六方氮化硼復(fù)合三維導(dǎo)熱網(wǎng)絡(luò)。研究了制備過(guò)程中石墨烯與氮化硼的質(zhì)量比對(duì)導(dǎo)熱網(wǎng)絡(luò)結(jié)構(gòu)的影響,同時(shí)探索了石墨烯與氮化硼之間的協(xié)同效應(yīng),以及氧化石墨烯與氮化硼的質(zhì)量比對(duì)復(fù)合材料的導(dǎo)熱性能和絕緣性能的影響。結(jié)果表明,石墨烯與氮化硼的復(fù)合并用提升了體系的導(dǎo)熱性能,同時(shí)與單純使用石墨烯相比,賦予了導(dǎo)熱復(fù)合材料更好的絕緣性能。
[Abstract]:Thermal conductivity composite material, which is used for heat transfer between heat source and radiator, has an important effect on the normal operation and service life of electronic components. Therefore, the preparation of thermal conductive composites with high thermal conductivity has become an important research topic in the field of thermal conductivity. The thermal conductivity of graphene is as high as 5300 W / m Ke, which is the highest among known materials. At the same time, it has the advantages of light weight, high specific surface area, stable structure, good mechanical properties and so on. It has become one of the most ideal thermal conductivity fillers at present. However, it is difficult to realize the uniform dispersion of graphene in polymer matrix by traditional blending method, which is not conducive to the construction of efficient thermal conductivity network. At the same time, it is difficult to control the structure of graphene heat conduction network by blending method, and it is unable to display the anisotropic thermal conductivity of graphene. In order to solve the above problems, this paper proposes a new method to fabricate thermal conductivity composites with high thermal conductivity by constructing a three dimensional heat conduction network based on graphene by self assembly. The main work of this paper is as follows: 1. Through ethanol and water mixed solvent volatilization induced graphene self-assembly, the three-dimensional thermal conductivity network of graphene was constructed, and then the high thermal conductivity composite was obtained by resin perfusion. The effects of the concentration of graphene, the volume ratio of ethanol and water in the mixed solvent, the volatilization temperature on the structure of the three-dimensional assembly and the microstructure of the three-dimensional assembly were studied. The effect of density on the thermal conductivity of composites. The results show that this method not only ensures the good dispersion of graphene, but also realizes the directional arrangement of graphene in polymer matrix to a certain extent. Therefore, graphene based thermal conductive composites with excellent thermal conductivity can be obtained. Using graphene oxide and boron nitride as precursors, a three-dimensional thermal conductivity network of graphene and hexagonal boron nitride can be constructed by hydrothermal method. The effect of the mass ratio of graphene to boron nitride on the thermal conductivity network was studied, and the synergistic effect between graphene and boron nitride was explored. The effect of the mass ratio of graphene oxide to boron nitride on the thermal conductivity and insulation properties of the composites was also discussed. The results show that the composite of graphene and boron nitride can improve the thermal conductivity of the composites, and the thermal conductivity of the composites is better than that of the simple use of graphene.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 Xiang-Fen Jiang;Qunhong Weng;Xue-Bin Wang;Xia Li;Jun Zhang;Dmitri Golberg;Yoshio Bando;;Recent Progress on Fabrications and Applications of Boron Nitride Nanomaterials:A Review[J];Journal of Materials Science & Technology;2015年06期

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本文編號(hào)：1977829