铝/金刚石复合材料各向异性界面可控机制及对导热性能影响的研究

项目名称： 铝/金刚石复合材料各向异性界面可控机制及对导热性能影响的研究

项目编号： No.51301018

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 张洋

作者单位： 北京科技大学

项目金额： 25万元

中文摘要： 金刚石颗粒增强铝基复合材料理论上可以获得优异的热物理性能，是理想的电子封装材料。目前，采用气体压力熔渗法可以使复合材料热导率得到显著提高，但发现{111}界面的优化程度明显弱于{100}界面，表现为界面各向异性。通过{111}和{100}界面优化进程的有效调控，有望进一步提高材料热导率。本项目即针对各向异性界面问题，通过改变气体压力熔渗工艺参数，获得具有不同界面状态的复合材料，结合界面显微结构的深入分析，系统研究成型工艺对各向异性界面的控制机制和影响规律；测定热导分布及界面热导，利用声子导热理论揭示界面显微结构决定界面热导的物理机制；完善适用于各向异性界面的复合材料导热模型。通过本项目工作，初步建立气体压力熔渗制备铝/金刚石复合材料中工艺、组织、性能的材料科学与工程三要素间基本关联，研究成果为高导热铝/金刚石复合材料的设计提供科学依据，同时对促进材料应用和气体压力熔渗技术推广具有重要意义。

中文关键词： 铝/金刚石复合材料；各向异性界面；界面反应；热导率；

英文摘要： Diamond particles reinforced aluminum (Al/diamond) composites can obtain the excellent thermo-physical properties theoretically. It is the promising candidate for a new generation of thermal management materials. Currently, thermal conductivity of Al/diamond composites can be enhanced significantly by using the new preparation technology as gas pressure infiltration. However, it is found that the interfacial optimization at {111} interface is violent weak comparing with {100} interface, which means that the interface of composites behaves a distinct character of anisotropy. By means of the effective control of optimization process at {111} and {100} interfaces, thermal conductivity of Al/composites can be further improved. This proposal is focused on the problems of anisotropic interface. On this research, a series of composites will be fabricated by gas pressure infiltration. Moreover, the interface state of the composites will be controlled by regulating fabricating parameters. Based on the analysis of interfacial microstructure with methods of FIB & TEM, the control mechanism of anisotropic interface affected by fabricating parameters will be systematic investigated.Furthermore，detection of thermal conductivity distribution and measurement of interfacial thermal conductance can be done by SThM. And in vie

英文关键词： Al/diamond composites；anisotropic interface；interfacial reaction；thermal conductivity；