Possibility of Unusually High Thermal Conductivity Along Metal Ceramic Interfaces in the Aluminum-Spinel System

铝-尖晶石系统中金属陶瓷界面可能具有异常高的导热率

• 批准号: 9610167
• 负责人: Rishi Raj
• 金额: $ 5.6万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9610167&HistoricalAwards=false
• 关键词: Possibility; Unusually; Thermal; Conductivity; Along

9610167 Raj The focus of this SGER project is the measurement of thermal conductivity of interfaces in metal-ceramic composites. The research concentrates on a detailed study of particulate composites consisting of a pure aluminum matrix dispersed with particles of magnesium aluminate spinel. This is motivated by preliminary evidence that interfaces in aluminum-spinel composites enhance the overall thermal conductivity of the composite, in stark contrast to the conventional finding that composite interfaces reduce thermal conductivity. The effort includes preparation of several specimens with different volume fractions and different particle sizes of spinel. The thermal diffusivities of these specimens are measured and the microstructure carefully characterized to confirm or refute the existence of an anomalous thermal conduction along the aluminum-spinel interface. The research is a collaboration between the University of Colorado at Boulder and Virginia Polytechnic Institute in Blacksburg, VA. If this exploratory research produces a positive result then a regular proposal to investigate the phenomenon at an atomistic level will be submitted to the Foundation. %%% This enhanced thermal conduction effect could be applied to many commercially important materials systems, such as electronic packaging and multilayer devices. ***

9610167 Raj 该 SGER 项目的重点是金属陶瓷复合材料界面导热系数的测量。 该研究集中于对由分散有铝酸镁尖晶石颗粒的纯铝基体组成的颗粒复合材料的详细研究。 初步证据表明，铝-尖晶石复合材料中的界面增强了复合材料的整体导热系数，这与复合材料界面降低导热系数的传统发现形成鲜明对比。 这项工作包括制备具有不同体积分数和不同尖晶石颗粒尺寸的多个样品。 测量这些样品的热扩散率并仔细表征微观结构，以确认或反驳沿铝-尖晶石界面存在异常热传导。 这项研究是科罗拉多大学博尔德分校和弗吉尼亚理工学院位于弗吉尼亚州布莱克斯堡的合作项目。 如果这项探索性研究产生积极的结果，那么将向基金会提交一份在原子水平上调查该现象的定期提案。 %%% 这种增强的热传导效应可以应用于许多商业上重要的材料系统，例如电子封装和多层器件。 ***