Weldability study in dissimilar microwelding of nickel-titanium alloys

镍钛合金异种材料微焊接可焊性研究

• 批准号: 537172-2018
• 负责人: Zhou, Norman
• 金额: $ 2.24万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=699343
• 关键词: Weldability; study; dissimilar; microwelding; nickel

Welding and joining of dissimilar materials, such as Nickel-Titanium (NiTi) alloys to other alloys, remains as one of the main challenges in manufacturing medical devices. The main issue is the formation of intermetallic compounds (IMCs) that is normally detrimental to the joint properties and performance. The current proposal seeks, in collaboration with Baylis Medical, a systematic study of laser dissimilar microwelding of NiTi alloys to Ti alloys or stainless steel for catheter guidewire and other medical device applications aiming to improve understanding of the effects of base metal chemistry and conditions, and laser welding process parameters and configurations on the IMC formation and its influence on mechanical properties. It is especially planned to investigate and develop the use of interlayers to limit IMC formation. While this project will study primarily laser welding, other welding processes such as resistance microwelding will be explored as alternatives to form solid-state welds so IMCs might be completely eliminated. The proposed work would strengthen Canada's position in the fields of design and fabrication of medical devices and other microsystems in general, and advanced materials joining in particular. Specifically, the knowledge and engineering know-how developed in this proposed work will make significant contributions (in terms of journal and conference publications) to the science and technology of dissimilar materials joining. It will also provide engineering guidelines to optimize the process conditions and to increase flexibility for design and fabrication of medical devices. This work will also foster development of welding and joining expertise at different levels (undergraduate and graduate students, and post-doctoral fellows), as needed by manufacturing industries.

不同材料的焊接和连接，例如与其他合金的镍钛合金（NITI）合金，仍然是制造医疗设备的主要挑战之一。主要问题是形成金属间化合物（IMC），通常不利于关节性能和性能。 当前的建议寻求与Baylis Medical合作，对激光差异化合物的激光差异化合物对Ti合金或不锈钢进行了系统研究，用于导管导管和其他医疗设备应用，旨在提高对基础金属化学和条件的影响，以及激光焊接过程的效果，以及对IMC的构成及其影响力的效果及其影响力的影响。特别计划调查和开发使用中间层以限制IMC形成的使用。尽管该项目将主要研究激光焊接，但将探索其他焊接过程，例如抗性微燃料，作为形成固态焊接的替代方法，因此可以完全消除IMC。 拟议的工作将加强加拿大在医疗设备和其他微系统的设计和制造领域的地位，尤其是高级材料。 具体而言，在这项拟议的工作中发展的知识和工程知识将为相差材料加入的科学和技术做出重大贡献（就期刊和会议出版物而言）。它还将提供工程准则，以优化过程条件并提高设计和制造医疗设备的灵活性。这项工作还将根据制造行业的需要，促进不同级别（本科生和研究生和博士后研究员）的焊接和加入专业知识。