银钯复合微纳米晶的可控制备及其结构稳定性的微观机理

项目名称： 银钯复合微纳米晶的可控制备及其结构稳定性的微观机理

项目编号： No.51261008

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 陈立桥

作者单位： 昆明贵金属研究所

项目金额： 50万元

中文摘要： 材料的复合效应成功地实现了贵金属性能的明显改善，而对二元合金与核壳复合结构的液相生长机理认识不足及微组织结构稳定性规律探索的有限性，一直是制约双组分贵金属体系推广应用的主要障碍。本项目瞄准当前贵金属复合粉体的科学、高效制备所面临的重要科学问题，以其在电子信息领域应用中所面临的性能要求为导向，拟通过选取多种液相制备方法和手段，可控制备组分或尺寸连续可调的银钯复合微纳米晶并寻找存在于液相中的二元金属成核生长的物理化学规律；进而通过在不同气氛中对复合结构进行热处理，实现界面结构演化与体系微结构的可调变化；通过微结构的表征分析，结合复合体系热稳定性与银迁移特性的评估，获得晶体微结构与稳定性的关系规律；项目同时拟通过实验表征与理论计算相结合的方式，从原子与电子层次上揭示银基复合结构中微结构演化过程与机理。项目实施对于高效、科学的设计和制备其它贵金属复合微纳米粉体提供理论和实验指导。

中文关键词： 银钯；合金粉；核壳结构；可控制备；热稳定性

英文摘要： Due to the composite effect among the compositions, the precious metal materials' performances get significant improvement, but the lack of knowledge for the growth mechanism of the binary alloys or core-shells composited structures, and the inherent law of the composited structure stability have been the main obstacles to enhance the property and enlarge application for two-component noble metal systems. This project will firstly aim at some important scientific problems to study, for example, the effective preparation for the precious metal composite powders; further, we will focus on resolving its performance requirements in the field of electronic information. by choosing a variety of preparation method to continuously control the compositions or sizes, and find the physical and chemical laws during binary metal nucleation and growth in solution; and then the composite structure are treated in a different atmosphere with heating to achieve adjustable evolution of interface structure and the changes of the composite' microstructures; by the microstructure characterization combined with the analysis of the thermal stability and the silver migration behavior, we will obtain the relationship laws between microstructure and stability of the system. At the same time, the project will reveal the microstructure evo

英文关键词： Silver-palladium；alloy powders；core-shell structure；controlable synthesis；thermal stability