基于形状记忆合金/聚合物复合材料的双稳致动器

Sabrina M. Curtis, Duygu Dengiz, P. Velvaluri, L. Bumke, E. Quandt, M. Sielenkämper, S. Wulfinghoff, Gowtham Arivanandhan, Zixiong Li, M. Kohl
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引用次数: 2

摘要

利用tinhf /SiO2/Si复合材料的热诱导马氏体相变进行双向驱动。与相同厚度的独立薄膜相比,基底上的薄膜在热循环时表现出较小的疲劳效应和较小的滞后宽度。差示扫描量热法(DSC)和悬臂挠度测量(CDM)结果表明,制备的TiNiHf薄膜和TiNiHf/SiO2/Si双晶复合材料的转变温度随着热循环而降低。与独立薄膜的功能疲劳DSC结果相比,结合在SiO2/Si衬底上的TiNiHf薄膜在40个热循环后的转变温度变化显著降低。与相同厚度的独立薄膜相比,受SiO2/Si和Si衬底约束的tinhf薄膜的热滞后宽度也减小了。通过适当的成分选择和微观结构控制,TiNiHf薄膜可以成为具有PMMA/TiNiHf/Si复合材料的双稳致动器的有前途的SMA薄膜。
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Bistable Actuators Based on Shape Memory Alloy/ Polymer Composites
The thermal induced martensitic phase transition in TiNiHf was exploited for bi-directional actuation with TiNiHf/SiO2/Si composites. When compared to free-standing films of similar thickness, films on a substrate exhibit a reduced fatigue effect upon thermal cycling and a smaller hysteresis width. Differential scanning calorimetry (DSC) and cantilever deflection measurements (CDM) results showed that the transition temperatures of fabricated TiNiHf films and TiNiHf/SiO2/Si bimorph composites decrease with thermal cycling. The change in transition temperatures after 40 thermal cycles is significantly reduced for TiNiHf films bound to a SiO2/Si substrate compared to the functional fatigue DSC results reported for freestanding films. The thermal hysteresis width is also reduced for TiNiHf films constrained by SiO2/Si and Si substrates compared to freestanding films of similar thicknesses. With proper composition selection and microstructural control, TiNiHf films can be promising SMA films for bistable actuators with PMMA/TiNiHf/Si composites.
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