Method and device for testing thermal physical property of single conductive filamentary material by using harmonic method

Abstract

The invention discloses a method and a device for testing thermal physical property of a single conductive filamentary material by using a harmonic method. The device comprises that: a single filamentary sample is fixed on a filamentary sample fixer, and the filamentary sample fixer is placed in parallel at the cavity bottom of a thermostatic vacuum cavity; one end of a thermocouple of a temperature adjusting system is inserted in the cavity, the other end of the thermocouple of the temperature adjusting system is electrically connected with a temperature controller, a TEC heater / cooler is arranged in an insulating layer in a mode of jointing the cavity, and the start and shutdown of the TEC heater / cooler is controlled by the temperature controller; a vacuum pumping system is externally connected with the cavity; and a harmonic measurement unit is electrically connected with the single filamentary sample, fundamental voltages, third harmonic voltages and phase angles at two ends of the single filamentary sample under multiple frequencies are measured by using the harmonic method, and heat conduction coefficient, heat capacity and thermal diffusivity parameters of the single filamentary sample are fitted according to the harmonic test principle.

Description

technical field [0001] The invention relates to a method and device for measuring thermophysical parameters (such as thermal conductivity, thermal diffusivity and heat capacity, etc.) A method and device for testing thermal and physical parameters of conductive filamentary materials such as carbon nanotubes. Background technique [0002] Carbon fiber and carbon nanotubes have been widely used as reinforcing bases of various composite materials to improve the thermal performance of new military and civilian dual-use materials such as solid rocket motor nozzle insulation layer and aircraft structural materials. Accurate measurement of the thermal parameters of the filament-like material itself plays an important role in the thermal design and thermal control of the above-mentioned composite materials. However, the diameter of carbon fibers is generally less than 10 μm, while the diameter of carbon nanotubes is even smaller, generally in the order of nm, so it becomes very dif...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical defect that the existing thermal physical property measurement method based on bulk material cannot accurately measure the thermal physical property parameters of a single microscale filamentous material, and is independent of the T-type method that can be used for the thermal physical property test of a single filamentary material

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