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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=683723
• 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.

镍钛 (NiTi) 合金等异种材料与其他合金的焊接和连接仍然是医疗器械制造中的主要挑战之一。主要问题是金属间化合物 (IMC) 的形成，这通常对接头特性和性能有害。 目前的提案寻求与 Baylis Medical 合作，对 NiTi 合金与钛合金或不锈钢的激光异种微焊接进行系统研究，用于导管导丝和其他医疗器械应用，旨在提高对母材化学和条件的影响的理解，以及激光焊接工艺参数和配置对 IMC 形成及其对机械性能的影响。特别计划研究和开发使用中间层来限制 IMC 的形成。虽然该项目将主要研究激光焊接，但也将探索电阻微焊接等其他焊接工艺作为形成固态焊接的替代方法，因此可能完全消除金属间化合物。 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，特别是先进材料连接领域的地位。 具体来说，这项拟议工作中开发的知识和工程技术将为异种材料连接的科学和技术做出重大贡献（在期刊和会议出版物方面）。它还将提供工程指南，以优化工艺条件并提高医疗设备设计和制造的灵活性。这项工作还将根据制造业的需要，促进不同级别（本科生、研究生和博士后）焊接和连接专业知识的发展。