双官能型POSS的合成及其对高发射材料性能的影响

发布时间：2018-01-15 05:24

  本文关键词：双官能型POSS的合成及其对高发射材料性能的影响　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 热防护体系 高发射率材料 POSS溶胶体系 抗热震性

【摘要】：红外辐射材料现如今广泛应用于工业炉以及航天领域中。尤其是在航天领域,当航天器穿过大气层返回到地面的过程中,会产生大量的热量,如果热量不能及时散发出去,是对航天器致命的损坏。因此热防护体系的研究就倍受关注。高发射材料能够将在基底表面的热量以辐射的形式散发出去,来降低温度。因此将高发射材料涂覆到航天器上能够很有效的解决其表面过热的现象。而当前的研究重点是提高涂层发射率和抗热震性能。本实验主要目的是制备出抗热震性能良好的高发射涂层。我们以POSS溶胶为粘结剂,Si C、Mo Si2为主要原料,添加过渡金属氧化物实现多组分的复合,采用球磨的方法制备涂料。采用涂覆的方式,将POSS溶胶和涂料依次涂覆到陶瓷基的基底上,热固化后得到涂层。通过SEM对涂层的表面和断面形貌进行了测试分析,并用红外测试和XRD研究在过程中涂料发生的结构变化。最后对涂层的发射率以及抗热震性能进行测试分析。通过分析XRD测试得到,在800~1000℃时,有部分的Si C、Mo Si2被氧化,这是涂层在800℃发射率降低的原因,1000℃烧结后形成了蓝色的涂层,Co Mo O4的含量是相对增加的。涂层的抗热震性能分析得到,400℃下热固化以及升温速率为5℃/min得到的涂层抗热震性能是最好的,以双官能型的POSS为粘结剂的效果较好,同样的Zr O2的加入使得热振循环次数增加。红外发射率的结果显示,过渡金属的添加,也就是Si C-Mo Si2-Al2O3-Co3O4-Ni O-Zr O2体系,使得涂层400℃下的发射率增加,同时在11~22μm波段范围内是平稳的。
[Abstract]:Infrared radiation materials are now widely used in industrial furnaces and spaceflight, especially in aerospace, where large amounts of heat are generated as spacecraft return to the ground through the atmosphere. If heat is not released in time, it is a fatal damage to spacecraft. Therefore, the study of thermal protection system has attracted much attention. High emission materials can emit heat in the form of radiation from the substrate surface. So coating the high emission material on the spacecraft can effectively solve the problem of overheating on the surface. The current research focus is to improve the emissivity and thermal shock resistance of the coating. The main purpose of this experiment is to prepare. High emission coatings with good thermal shock resistance were prepared. We used POSS sol as binder. The multicomponent composite was realized by adding transition metal oxide (TMOX) as the main raw material, and the coating was prepared by ball milling. The POSS sol and coating were coated on the ceramic substrate in turn, and the coating was obtained after thermal curing. The surface and section morphology of the coating were tested and analyzed by SEM. Finally, the emissivity and thermal shock resistance of the coating were tested and analyzed. The results were obtained by analyzing the XRD test. At 800 鈩，

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