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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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开发强大的FeSiAl/PEEK复合材料,用于广泛的温度范围的电磁波吸收.

Jie Gao1, Zhenjie Guan1, Yuanxun Gong2

  • 1School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

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|January 9, 2025
PubMed
概括

研究人员开发了强大的FeSiAl/PEEK复合材料,用于微波吸收和机械强度. SiO2外在广泛的温度下提高了性能,为苛刻的应用提供了有前途的解决方案.

关键词:
铁/PEEK 是一个二氧化外的外.电磁波的吸收电磁波的吸收温度升高导致的温度升高.机械属性 机械属性 机械属性

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电磁学 电磁学 电磁学 电磁学
  • 聚合物复合材料 聚合物复合材料

背景情况:

  • 目前的研究重点是微波吸收涂层,往往忽略了具有集成机械性能的材料.
  • 开发具有微波吸收和机械强度的材料对于先进的应用至关重要.
  • 合金SiAl/PEEK复合材料具有潜力,但需要优化以适应广泛的温度性能.

研究的目的:

  • 准备和表征具有强大的FeSiAl/PEEK复合材料,具有增强的微波吸收和机械性能.
  • 为了研究SiO2外对电磁 (EM) 参数和机械行为在广泛的温度范围内的影响.
  • 评估材料适用于广泛温度范围的微波吸收应用的适用性.

主要方法:

  • 使用球磨后化,sol-gel方法和热压制制造薄片-FeSiAl@SiO2/PEEK复合材料的制造.
  • 在不同温度下对电磁参数 (反射损失,吸收带宽) 的详细分析.
  • 在不同的温度下 (298 K和573 K) 测试机械性能 (抗拉强度).

主要成果:

  • 含有20%体积%填充剂的Flaky-FeSiAl@SiO2/PEEK复合材料在X波段中表现出极好的广泛温度微波吸收.
  • 在室温下,最小反射损失 (RLmin) 达到-28.6dB,有效吸收带宽 (EAB) 为3.26GHz,厚度为1.8mm.
  • 在573K,RLmin为-25.8dB,EAB为2.04GHz,厚度为1.3毫米,表现保持性能.
  • 二氧化外改善了阻抗匹配,并在高温下减少了流损失.
  • 拉力强度在298K时达到84.38MPa,在573K时保持在16.33MPa,这表明机械性能得到了提高.

结论:

  • SiO2外对于在广泛的温度范围内保持微波吸收和机械完整性至关重要.
  • 薄片-FeSiAl@SiO2/PEEK复合材料在微波吸收和机械性能方面表现出有希望的平衡.
  • 这种材料是需要在极端温度条件下可靠性能的应用的强大候选者.