A compliant microstructured thermal interface material for dry and pluggable interfaces
A compliant microstructured thermal interface material for dry and pluggable interfaces
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DOI：
10.1016/j.ijheatmasstransfer.2018.11.074
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发表时间：
2019-03
影响因子：
5.2
通讯作者：
Jin Cui;Jicheng Wang;J. Weibel;Liang Pan
中科院分区：
文献类型：
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作者：
Jin Cui;Jicheng Wang;J. Weibel;Liang Pan
热界面材料（TIMs），如热膏和热垫，可以成功地通过填补由表面不平坦和粗糙造成的间隙来提高接触热导率。然而，对于可应用于电子系统中可插拔或可修改接口（例如光电收发器模块）的tim仍然存在未解决的需求。随着器件功率密度的增加，降低这些界面的接触热阻变得越来越重要。这些应用需要干接触界面，可以在低压下提供所需的导热性，并承受反复的机械压缩和剪切。我们提出了一种柔性的金属化翅片之字形微弹簧阵列，作为一种低成本的干式TIM，通过以每千帕几微米的速率有效调节表面非平整度，可以在低压（~ 10-100 s kPa）下实现保形界面接触。机械顺应性和热阻的实验表征证实了这种干式TIM可以在低压条件下实现非平坦配合面之间的保形热接触。这种干燥的TIM的总插入热阻，即使在非平坦表面上，也可与抛光和平坦的金属对金属接触相媲美。进行了机械压缩和剪切循环试验，以评估耐久性。
Thermal interface materials (TIMs), such as thermal pastes and pads, can successfully enhance contact thermal conductance by filling the gaps caused by the surface nonflatness and roughness. However, there is still an unaddressed demand for TIMs which can be applied to pluggable or reworkable interfaces in electronic systems, such as in opto-electronic transceiver modules. Reducing the contact thermal resistances at these interfaces has become increasingly important as device power density increases. These applications require dry contact interfaces that can offer the required thermal conductance under a low pressure and endure repeated mechanical compression and shear. We present a compliant metallized finned zig zag micro-spring array, as a low-cost dry TIM, that allows conformal interface contact at low pressures (∼10–100 s of kPa) by effectively accommodating surface nonflatness at a rate of a few µm per kPa. Experimental characterization of the mechanical compliance and thermal resistance confirm that this dry TIM can achieve conformal thermal contact between nonflat mating surfaces under low pressures. The total insertion thermal resistance of this dry TIM, even when mating to nonflat surfaces, is comparable to that of a polished and flat metal-to-metal contact. Mechanical compression and shear cycling tests are performed to assess the durability.