I-Corps: High efficiency multi-material heat sink/storage by additive manufacturing

这个i-Corps项目的更广泛的影响/商业潜力是开发一种使用形状记忆合金(SMA)生产固态热管理系统的添加剂制造工艺。SMAS得益于固-固相变，这在热沉/蓄热的许多应用中都是有意义的。然而，在使用传统方法加工镍钛(NiTi)等SMA时存在挑战，这将其设计限制在简单的几何形状上。建议的技术克服了这些挑战，通过添加制造方法制造SMA。使用NiTi的热管理系统可以使用3D打印技术进行额外制造。这项技术可能会有广泛的应用，包括用于卫星、电信天线和消费电子产品的散热片/存储。由于对更安全和更环保系统的需求，人们越来越需要开发更好的固态热管理系统。这个i-Corps项目基于开发一种将形状记忆合金制造成复杂几何形状的添加剂制造方法。形状记忆合金，如镍钛(NiTi)，提供固-固相变，这降低了其他相变材料的泄漏风险。此外，NiTi作为一种具有高体积潜热和优异耐腐蚀性的相变材料，已被报道用于提高蓄热系统的效率。这项拟议的技术将相变NiTi材料与高导热材料(如铜)相结合，以产生能量存储和转换系统。已经证明，与单独使用铜散热器相比，使用镍钛/铜三明治可以延长达到临界温度的时间。这一结果表明，它可以在广泛的应用中使用，包括卫星的散热器/存储、电信天线和超调控制器。此外，可逆的固体-固体马氏体相变消除了泄漏风险，并降低了这些应用程序的维护成本。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

The broader impact/commercial potential of this I-Corps project is the development of an additive manufacturing process to produce solid-state heat management systems using shape memory alloys (SMAs). SMAs benefits from a solid-solid phase transformation, which is of interest in many applications of heat sink/storage. However, there are challenges in processing of SMAs such as nickel titanium (NiTi) using conventional methods, which limits its design to simple geometries. The proposed technology overcomes these challenges by fabrication of SMAs through additive manufacturing methods. Heat management systems using NiTi may be additively manufactured using 3D printing technology. This technology may have a wide range of applications including heat sink/storage for satellites, telecommunication antennas, and consumer electronics. There is a growing need to develop better solid-state heat management systems driven by the need for safer and more environmentally friendly systems.This I-Corps project is based on the development of an additive manufacturing method to fabricate shape memory alloys into complex geometries. Shape memory alloys such as nickel titanium (NiTi) offer solid-solid phase change, which reduces the risk of leakage observed with other phase change materials. In addition, NiTi as a phase change material with high volumetric latent heat as well as excellent corrosion resistance has been reported to improve the efficiency for thermal storage systems. The proposed technology couples phase changing NiTi material with a high thermal conductivity material such as copper to produce energy storage and conversion systems. It has been demonstrated that using a sandwich of NiTi/Copper can increase the time to reach the critical temperature when compared to a copper heat sink alone. This result indicates that this may be used in a wide range of applications including heat sink/storage for satellites, telecommunication antennas, and overshoot controllers. Moreover, the reversible solid-solid martensite transformation eliminates the risks of leakage and reduces the cost of maintenance of these applications.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.