Laser induced forward transfer of NiTi deposits for functionally graded SMA components
Laser induced forward transfer of NiTi deposits for functionally graded SMA components
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用于功能梯度 SMA 组件的 NiTi 沉积物的激光诱导正向转移
DOI：
10.1117/12.2607801
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Muniraj L
中科院分区：
文献类型：
--
作者：
Muniraj L
激光诱导前向转移(LIFT)是一种3D微细加工工具，其中激光脉冲被用来在衬底上顺序地打印金属的薄亚体素。我们正在开发一种基于Lift的工艺来制造具有形状记忆合金(SMA)特性的微米级部件，利用其高度的空间和时间控制。SMA表现出形状记忆效应；在此过程中，它们会产生大量的应变或力，因此可以用作微夹持器和光纤机械手等致动器的基础，用于外科和其他体内医疗应用。我们对镍钛(NiTi)SMA特别感兴趣，因为它们具有生物兼容性和接近体温的转变温度(材料返回初始状态的温度)。化学成分的微小变化可以用来调节它们的转变温度。然而，这些SMA的成分和空间控制仅限于宏观制造技术。在本文中，我们探索了一种利用Lift来局部控制NiTi合金成分的新方法。施主是由镍和钛薄膜组成的多层膜。在转移过程中，激光脉冲熔化和扩散金属，形成复合液滴。我们论证了获得等原子组成(50-50原子%)的NiTi沉积的可能性。传统的SMA控制参数范围较窄，这给执行器的设计带来了困难。然而，通过局部改变成分，局部调整转变窗口将是可行的，从而提供对温度的更复杂的响应，从而提供广泛的基于SMA的微致动器应用。
Laser-induced forward transfer (LIFT) is a 3D micro-fabrication tool wherein laser pulses are used to sequentially print thin sub-voxels of metal onto a substrate. We are developing a LIFT-based process to fabricate micron-scale parts with shape memory alloy (SMA) properties exploiting its high degree of spatial and temporal control. SMAs exhibit shape memory effect; during which they generate a substantial amount of strain or force, and hence can be used as the basis of actuators such as micro-grippers and fibre-optic manipulators, for surgical and other in-vivo medical applications. We are particularly interested in nickel-titanium (NiTi) SMAs given their biocompatibility and a transition temperature (the temperature at which the material returns to its initial state) close to body temperature. Small variations in chemical composition can be used to tune their transition temperature. However, compositional, and spatial control of these SMAs is limited to macroscopic manufacturing techniques. In this paper, we explore a novel approach to locally control the composition of NiTi alloy using LIFT. The donor is a multilayer comprising nickel and titanium thin films. During the transfer, the laser pulse melts and diffuses the metals forming a composite droplet. We demonstrate the possibility of obtaining NiTi deposits with equiatomic composition (50- 50 atomic %). Conventional SMAs have a narrow range of control parameters which makes it difficult for actuator design. However, by locally altering the composition, it would be feasible to locally tune the transformation window, providing a more complex response to temperature and hence a wide range of SMA based micro-actuator applications.
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