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Deep space radiations-like effects on VO2 smart nano-coatings for heat management in small satelittes

机译：VO2智能纳米涂层的深空辐射效应，用于小型卫星的热管理

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Thermal control in spacecraft will be increasingly important as the spacecraft grows smaller and more compact. Such spacecraft with low thermal mass will have to be designed to retain or reject heat more efficiently. The passive smart radiation device (SRD) is a new type of thermal control material for spacecraft. Current space thermal control systems require heaters with an additional power penalty to maintain spacecraft temperatures during cold swings. Because its emissivity can be changed without electrical instruments or mechanical part, the use of SRD decreases the request of spacecraft power budget. The (SRD) based on VO2 films is one of the most important structures of the functional thermal control surface, being lighter, more advanced and without a moving devices. A large portion of the heat exchange between an object in space and the environment is performed throughout radiation, which is in turn determined by the object surface properties. The modulation device is coated on the spacecraft surface and thus provides a thermal window that can adapt to the changing conditions in orbit.VO2 is well known to have a temperature driven metal to insulator transition ≈ 68ᴼC accompanying a transformation of crystallographic structure, from monoclinic (M-phase, semiconductor) at temperature below 68ᴼC to tetragonal (R-phase, metal) at temperature above 68ᴼC. This transition temperature is accompanied by an increase of infrared reflectivity and a decrease of infrared emissivity with increasing temperature. This flexibility makes VO2 potentially interesting for optical, electrical, and electro-optical switches devices, and as window for energy efficiency buildings applications. This study reports on effect of thickness on VO2 as well as the effect of proton irradiation on VO2 for active smart radiation device (SRD) application. VO2 was deposited on mica by Pulsed laser deposition techniques. The thickness of the film was varied by varying the deposition time. To characterize VO2 the following techniques were performed: XRD, AFM, SEM, TEM, XPS, RBS, RAMAN and transport measurements for optical properties. The effect of proton irradiation was observed using the SEM, where the change in structure, from crystal grains to rods, was observed.
机译：随着航天器变得越来越小，越来越紧凑，航天器中的热控制将变得越来越重要。这种具有低热质量的航天器将必须设计成更有效地保留或排出热量。无源智能辐射装置（SRD）是一种用于航天器的新型热控制材料。当前的空间热控制系统要求加热器具有额外的功率损失，以在冷摆期间维持航天器的温度。由于无需使用电气仪器或机械部件即可更改其发射率，因此SRD的使用降低了航天器功率预算的要求。基于VO2膜的（SRD）是功能性热控制表面的最重要结构之一，它更轻，更先进并且没有移动装置。在整个辐射过程中，空间和环境之间的对象之间的大部分热交换都是通过辐射进行的，而辐射又取决于对象的表面特性。调制装置涂在航天器表面上，因此提供了一个可以适应轨道变化条件的热窗口。众所周知，VO2具有温度驱动的金属到绝缘体的转变，温度约为68ᴼC，伴随着晶体结构从单斜晶转变。温度低于68°C时为M相（半导体），而温度高于68°C时则为四方（R相，金属）。随着温度的升高，该转变温度伴随着红外反射率的增加和红外辐射率的降低。这种灵活性使VO2对于光学，电气和光电开关设备以及作为节能建筑应用的窗口具有潜在的吸引力。这项研究报告了厚度对VO2的影响以及质子辐照对VO2的影响，适用于有源智能辐射装置（SRD）。 VO2通过脉冲激光沉积技术沉积在云母上。通过改变沉积时间来改变膜的厚度。为了表征VO2，执行了以下技术：XRD，AFM，SEM，TEM，XPS，RBS，RAMAN和光学性能的传输测量。使用SEM观察质子辐照的效果，其中观察到从晶粒到棒的结构变化。

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