纳米铜及多孔铜的制备及其性能研究

发布时间：2018-04-30 04:39

  本文选题：片状纳米铜 + 低共熔溶剂　； 参考：《南昌航空大学》2015年硕士论文

【摘要】：纳米铜粉在电子封装材料、多孔散热材料、高级润滑油、催化剂等诸多领域具有广泛的用途。而多孔金属铜可望在催化、传感、驱动和CPU散热等领域获得广泛应用。本文以不同种类的离子液体为反应介质,在不同反应温度下,以Cu(NO3)2为铜源,水合肼为还原剂,采用离子热法合成了纳米铜粉。研究了反应介质种类和溶液的PH值等因素对纳米铜颗粒形貌的影响。采用XRD、SEM、XPS和紫外-可见光光谱对所制备的纳米铜粉进行了表征。同时以纳米铜颗粒为原料,g-C3N4为造孔剂,采用微波烧结法制备了多孔铜散热材料,并对多孔铜散热材料性能的影响因素进行了研究。主要概括如下:1.当反应温度在120℃-160℃时,所制备的样品只有铜物相,而当反应温度达到180℃时,所制备的样品除了铜物相,还有Cu2O生成。2.当反应介质为四乙基溴化铵/丁二酸离子液体体系时,所制备的纳米铜呈三角状,而当反应介质为尿素/氯化胆碱离子液体体系时,所制备的纳米铜呈不规则球形。3.所制备的三角形纳米铜在200-900 nm波长范围有两个吸收峰,分别在525 nm和605 nm处。4.通过多孔铜孔隙率的对比研究发现:多孔铜散热材料的孔隙率随着C3N4体积分数增加而增加;温度从750℃升到800℃时,孔隙率变化不大,当温度超过825℃时,孔隙率突降;但保温时间从10min增至40min,孔隙率变化很小。5.通过多孔铜力学性能的对比研究发现:随着孔隙率的增大,多孔铜抗弹性变形能力极剧降低,弹性区间变形范围明显减小;发泡剂C3N4含量保持70%不变,多孔铜的力学性能随烧结温度的升高而变好。6.通过多孔铜热导率的研究发现:多孔铜导热系数皆随着多孔铜孔隙率的增大而降低。铜在775℃以下烧结时,导热系数较低,烧结温度在800℃和825℃时,导热系数显著提高。7.通过多孔铜膨胀系数的研究发现:在30℃~150℃温度范围内,相同温度下,不同C3N4体积分数的多孔铜线膨胀系数相差不大,在温度超过80℃后,不同C3N4体积分数多孔铜试样的线膨胀系数近似相同,都稳定在一个固定值。
[Abstract]:Nano-copper powder has been widely used in many fields such as electronic packaging materials, porous heat dissipation materials, high-grade lubricating oils, catalysts and so on. The porous metal copper is expected to be widely used in the fields of catalysis, sensing, driving and CPU heat dissipation. In this paper, nanocrystalline copper powder was synthesized with different kinds of ionic liquids as reaction medium, Cu(NO3)2 as copper source and hydrazine hydrate as reducing agent at different reaction temperature. The effects of reaction medium and pH value of solution on the morphology of copper nanoparticles were studied. The prepared nano copper powders were characterized by XRDX SEMX XPS and UV-vis spectra. At the same time, the porous copper heat dissipation material was prepared by microwave sintering with nano-copper particles as raw material and g-C _ 3N _ 4 as pore-forming agent, and the factors affecting the properties of porous copper heat dissipation materials were studied. The main generalizations are as follows: 1. When the reaction temperature is between 120 鈩，

本文编号：1823149