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An important step in microwave processing of materials: permittivity measurements of thermoplastic composites at elevated temperatures

机译:材料微波处理中的重要一步:在高温下测量热塑性复合材料的介电常数

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摘要

[Abstract]: The dielectric constant, ε′, dielectric loss, ε″, and loss tangent, tan δ, of some commonly used thermoplastics have been measured at various temperatures and frequencies. They do give some clues to the suitability of microwave processing of certain fibre-reinforced thermoplastic (FRTP) composites but cannot provide definite answers to the problems. Few measurements, if any, of the ε or the tan δ of FRTP composites have been reported in the literature. This paper describes a convenient laboratory based method designed to obtain ε′, ε″ and hence tan δ. The method employs an automatic logic network analyser and is called the waveguide transmission technique or transmission line method and is chosen because it provides the widest possible frequency range with high accuracy and utilised available the hardware and software. The required data were collected at a range of elevated temperatures and over a band of frequencies. The relationship between ε′ and ε″, or the tan δ of the composites and their weldability by microwave energy is also studied and discussed. udud
机译:[摘要]:已经在各种温度和频率下测量了一些常用热塑性塑料的介电常数ε',介电损耗ε''和损耗角正切值tanδ。它们确实为某些纤维增强的热塑性塑料(FRTP)复合材料的微波加工是否适用提供了一些线索,但不能为这些问题提供确切的答案。文献中几乎没有对FRTP复合材料的ε或tanδ进行测量的方法。本文介绍了一种方便的基于实验室的方法,旨在获得ε',ε''和tanδ。该方法采用自动逻辑网络分析仪,被称为波导传输技术或传输线方法,之所以选择该方法,是因为它以高精度提供了尽可能宽的频率范围,并利用了可用的硬件和软件。在一定范围内的高温和一定频率范围内收集了所需的数据。还研究和讨论了ε'和ε''之间的关系或复合材料的tanδ及其通过微波能量的可焊性。 ud ud

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