Solid material thermal diffusion coefficient measuring device and measuring method thereof

Abstract

The invention provides a solid material thermal diffusion coefficient measuring device and a measuring method thereof, and relates to the technical field of measurement of thermal physical property of solid materials. The solid material thermal diffusion coefficient measuring device comprises a heating device, a loading device, an infrared detector, a computer control and collecting system, a stepped motor control system and a pressure display device, wherein the loading device is arranged just above the heating device, and is provided with a support plate, a force applying plate, connecting pieces, testing holes and pressure sensors; the loading device is provided with at least three connecting pieces which are symmetrically distributed, the upper end of each connecting piece is fixedly connected with the force applying plate, and the lower end of each connecting piece is fixedly connected with the support plate; each pressure sensor is arranged at the bottom part of the corresponding connecting piece, and the testing holes are respectively formed in the centers of the force applying plate and the support plate; the infrared detector is arranged just above the loading device; the signal input end of the computer control and collecting system is connected with the signal output end of the infrared detector; the signal input end of the pressure display device is electrically connected with the signal output end of each pressure sensor.

Description

technical field [0001] The invention relates to the technical field of measuring thermal physical properties of solid materials, in particular to a measuring device and a measuring method for thermal diffusivity of solid materials based on a laser flash method. Background technique [0002] At the same temperature, the thermal conductivity of a material is the product of thermal diffusivity, density, and specific heat capacity. Specific heat capacity and density are the properties of the material itself, and the test method is very mature. Therefore, as long as the thermal diffusivity of the material is measured, the thermal conductivity can be determined. The thermal diffusivity characterizes the heat transfer ability of materials, and has important uses in the fields of materials, energy, construction, aviation, chemical industry, refrigeration engineering, etc., especially in engineering thermal design and system safety analysis. application. Its test method has also be...

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Problems solved by technology

This method solves some problems, but there are also shortcomings: the inventive device is only suitable for measuring the thermal diffusivity of large-scale samples, and the accuracy is very low, so it is not suitable for measuring the properties of materials

[0005] In the document "Influence of High Pressure Treatment on Thermal Diffusivity and Thermal Expansion Properties of Cu-50.84Cr-0.48Al Alloy", it is proposed to pressurize the sample with a six-sided top press before measuring the thermal diffusivity. This method can be used To explore the influence of pressure on the thermophysical properties of samples, but it is slightly insufficient: the regulation of pressure cannot be carried out in real time, so every time the pressure value is changed, the sample must be re-prepared, which not only has a great impact on the research progress, but also improves the research progress. cost

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