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

I-Corps项目更广泛的影响/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增材制造工艺。sma受益于固-固相变，这在散热器/存储的许多应用中都很感兴趣。然而，使用传统方法加工镍钛（NiTi）等sma存在挑战，这限制了其设计的简单几何形状。所提出的技术通过增材制造方法制造sma来克服这些挑战。使用NiTi的热管理系统可以使用3D打印技术进行增材制造。这项技术可能有广泛的应用，包括卫星、电信天线和消费电子产品的散热器/存储。由于需要更安全、更环保的系统，越来越需要开发更好的固态热管理系统。I-Corps项目的基础是开发一种增材制造方法，将形状记忆合金制造成复杂的几何形状。形状记忆合金如镍钛（NiTi）提供固-固相变，这降低了与其他相变材料观察到的泄漏风险。此外，镍钛作为一种相变材料，具有高体积潜热和优异的耐腐蚀性，可以提高储热系统的效率。提出的技术将相变NiTi材料与高导热材料（如铜）耦合在一起，以生产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/铜夹层可以增加达到临界温度的时间。这一结果表明，这可能用于广泛的应用，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-固马氏体相变消除了泄漏风险，降低了这些应用的维护成本。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值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.