热导电形态稳定相变材料由和纳米孔状结构扩展石墨实现
Yilin Zhao1,2,3, Shuhui Huang1,2, Zhaoguo Jin4
1State Key Laboratory of Nonferrous Metals and Processes, GRIMN Group Co., Ltd., Beijing 100088, China.
Nanomaterials (Basel, Switzerland)
|January 24, 2025
概括
新的石墨烯/扩展石墨复合材料为航天器的热管理提供了增强的导热性. 这些材料有效地减轻泄漏,保持稳定的组件温度,改善航天器的热控制系统.
科学领域:
- 材料科学 材料科学 材料科学
- 航空航天工程 航空航天工程
背景情况:
- (PW) 是用于太空飞船热管理的潜在材料.
- 低导热率和泄漏问题限制了其在先进航天器热控制系统中的应用.
- 像扩展石墨 (EG) 这样的现有导热增强剂在低填料含量下实现高导电性和防止泄漏方面面临挑战.
研究的目的:
- 开发热导电形状稳定型/扩展型石墨 (PW/EG) 复合材料.
- 增强用于航天器热管理的相变材料的导热性和稳定性.
- 为了解决与基复合材料相关的泄漏问题.
主要方法:
- 采用了两种制备方法:压力诱导方法和预制骨架方法.
- 扩张石墨被加工成纳米级的多孔结构,增强毛细血管的作用和吸附.
- 评估了准备好的复合材料的导热性,潜热和周期稳定性.
主要成果:
- 在10%的EG负载下,PW/EG复合材料达到9.99W/m·K和10.70W/m·K的导热率.
- 这两种方法的潜热量分别为240.06 J/g和231.67 J/g.
- 复合材料表现出极好的稳定性,在50个热循环后残量分数>99%,有效降低电子元件峰值温度至少23°C.
结论:
- 开发的PW/EG复合材料为航天器的热管理提供了一种新且具有成本效益的解决方案.
- 纳米级EG的多孔结构有效地减轻了泄漏,并提高了热性能.
- 这些材料显著提高了航天器热控制系统的能力.
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