超声波作用下液态活性钎料在碳材表面润湿行为及界面反应

项目名称： 超声波作用下液态活性钎料在碳材表面润湿行为及界面反应

项目编号： No.51465032

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 俞伟元

作者单位： 兰州理工大学

项目金额： 48万元

中文摘要： 先进碳材与金属钎焊时，熔融钎料在碳素材料表面的润湿性是保证钎焊成功的先决条件。但由于碳素材料与金属的物理及化学特性的巨大差异，致使大部分金属都不润湿碳材，尤其是在大气条件下钎焊时，很难形成完整接头。本项目以解决和提高大气条件下液态钎料在石墨表面的润湿性为目标，以构建超声波作用下液态钎料在石墨表面的润湿理论为学术思想。以活性钎料为研究对象，测定在不同条件下金属元素在石墨表面的接触角、粘着功、表面张力等基础数据。通过分子动力学模拟计算界面元素扩散及反应机理。研究超声波作用下，活性钎料在石墨表面的润湿行为及界面反应。通过热力学计算以及原子尺度的计算机模拟，构建大气条件下超声波活性钎焊的理论基础。研究解决超声波活性钎焊技术中的重大基础问题，为提升我国金属/碳素材料的钎焊技术，提供科学依据。

中文关键词： 活性钎料；润湿性；界面反应；碳素材料

英文摘要： When the advanced carbon materials and metal is joined with active brazing, the wettability of liquid filler metal on the surface of the carbon materials is a prerequisite for brazing. But due to there is a big difference between carbon materials and metal on the physical and chemical properties, the joint could not be formed because the wettabilty of filler metal on the surface of carbon material is poor under atmosphere condition. The aim of this project is to improve the wettability of the liquid filler metals on the surface of the graphite. To establish wetting theory of liquid filler metals on the surface of the graphite is chosen as the academic guiding ideology for this research.The active filler metals is choosed as study subjects. The contact angle, adhesion work ,surface tension of metal elements on the surface of the graphite and mechanism of interface element diffusion and reaction will be acquired under different conditions. The theoretical basis of active brazing under ultrasonic will be established by thermodynamic calculation and computer simulation of atomic scale. The wetting behavior and interface reaction research of the liquid filler metals on the surface of the graphite will be studied under the action of ultrasonic. The important basic problems in ultrasonic reactive brazing technology will be researched and solved. The scientific basis will be provided to enhance brazing technology of metal/carbon materials in our country.

英文关键词： Active brazing;Wetting;Interface reaction;Carbon material