GOALI: Dissimilar Metal Joining for Micro-Scale Medical Devices

GOALI：微型医疗器械的异种金属连接

• 批准号: 1130564
• 负责人: Y Lawrence Yao
• 金额: $ 34.84万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2015-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1130564&HistoricalAwards=false
• 关键词: GOALI; Dissimilar; Metal; Joining; Micro

The research objective of this Grant Opportunity for Academic Liaison with Industry (GOALI) award is to investigate a novel joining process, autogenous (no filler material) laser brazing, for joining dissimilar biocompatible metals. Specifically, the project aims to develop a fundamental understanding of autogenous laser brazed joints by considering the thermal, kinetic, and thermodynamic aspects of the process, to experimentally and numerically investigate the effect of non-equilibrium processing conditions on the thermodynamic properties of the weld metal mixture and their effect on the resulting phases and interface microstructures, and to significantly enhance the knowledge of intermetallic phase formation in dissimilar material pairs and investigate potential avenues for their mitigation or elimination. The projected approach to address this issue is by limiting mixing of the materials and rapidly cooling the molten metal without the use of filler materials. Phase, microstructure, and strength will be characterized. The results will validate the modeling efforts which will consist of finite cooling rate phase formation and spatially resolved composition calculations.The benefits of this project are expected to enable the design and fabrication of innovative, implantable medical devices that selectively incorporate biocompatible metals with unique properties to significantly enhance device performance or introduce groundbreaking functionalities. The need to join these materials stems from the desire to integrate their unique properties in a robust and cost-effective manner. The main impediment to widespread use of dissimilar metal joints, however, is the formation of brittle intermetallic phases within the joints. The PI's strong support by a key industrial partner could lead to rapid development of real life applications of these devices with broad societal impact. The processing techniques, analysis methods, and predictive capabilities developed for the biocompatible metal pairs addressed in this project can be extended to other material pairs for aircraft structure and automobile battery applications.

该学术与工业联络资助机会 (GOALI) 奖的研究目标是研究一种新颖的连接工艺，即自生（无填充材料）激光钎焊，用于连接不同类型的生物相容性金属。 具体来说，该项目旨在通过考虑工艺的热、动力学和热力学方面，对自生激光钎焊接头有一个基本的了解，通过实验和数值研究非平衡加工条件对焊缝金属混合物热力学性能的影响及其对所得相和界面微观结构的影响，并显着增强对金属间相形成的了解。 不同的材料对并研究缓解或消除它们的潜在途径。 解决这个问题的预计方法是限制材料的混合并快速冷却熔融金属，而不使用填充材料。将表征相、微观结构和强度。 结果将验证建模工作，其中包括有限冷却速率相形成和空间分辨成分计算。该项目的好处预计将能够设计和制造创新的植入式医疗设备，选择性地结合具有独特性能的生物相容性金属，以显着提高设备性能或引入突破性功能。 加入这些材料的需要源于希望以稳健且经济高效的方式整合其独特性能。然而，广泛使用异种金属接头的主要障碍是接头内脆性金属间相的形成。 PI 得到主要工业合作伙伴的大力支持可能会导致这些设备在现实生活中的应用快速发展，并产生广泛的社会影响。本项目中针对生物相容性金属对开发的加工技术、分析方法和预测能力可以扩展到飞机结构和汽车电池应用的其他材料对。