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Device and method for measuring thermal conductivity of porous powder material on basis of one-dimensional thermal conductive principle

A technology of porous powder and measuring device, applied in the direction of thermal development of materials, etc., can solve the problems of high cost and low accuracy of measurement method

Inactive Publication Date: 2016-11-23
SOUTHEAST UNIV
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Problems solved by technology

[0003] Purpose of the invention: In order to solve the technical problems of high cost and low measurement accuracy of porous powder material measuring devices in the prior art, the present invention provides a porous powder material thermal conductivity measuring device and method based on the principle of one-dimensional heat conduction

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  • Device and method for measuring thermal conductivity of porous powder material on basis of one-dimensional thermal conductive principle

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like figure 1 Shown is a structural diagram of an embodiment of the present invention, including a vacuum chamber 1, the chamber shell material of the vacuum chamber 1 is stainless steel, the inner wall is attached with a radiation screen, and there are two holes at the bottom of the chamber, which are the aviation plug interface 9 and the vacuum chamber. Molecular pump interface 10. The inside of the cavity includes a support table 2, a heating unit 3, a heating unit power lead 4, a first known sample 5, a circular ring 6, a second known sample 7, and a thermocouple 8; wherein:

[0029] The thermocouple 8 is a K-type thermocouple with a diameter of 0.8 mm. In this embodiment, 8 thermocouples are used to weld the surfaces of the first and second known samples at an interval of 4 mm by soldering to realize multi-point temperature collection. , The output end of...

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Abstract

The present invention provides a method for measuring the thermal conductivity of porous powder materials based on the principle of one-dimensional heat conduction. The powder sample to be measured is sandwiched between two samples with known thermal conductivity to form a sandwich structure and placed in a vacuum environment. The top of the sandwich provides a stable heat flow, and the thermocouple is welded equidistantly along the height direction on the surface of the known sample to measure the temperature, and the measured data is transmitted to the data acquisition instrument, and the temperature information obtained from the data acquisition instrument is analyzed by using LabVIEW software. The thermal conductivity of the sample to be tested can be calculated by curve fitting. The device is simple in structure, low in cost, simple in measurement method steps, and high in accuracy of measurement results, and can meet the thermal conductivity measurement requirements of powders with different particle sizes at different bulk densities.

Description

technical field [0001] The invention relates to the field of thermal conductivity measurement of porous powder materials, in particular to a device and method for measuring the thermal conductivity of porous powder materials based on the principle of one-dimensional heat conduction. Background technique [0002] Thermal conductivity, also known as thermal conductivity, is an important parameter to characterize the thermal conductivity of materials, and has important application value in industrial production, such as thermal insulation materials, pulverized coal in thermal power plants, etc. The practical application has good scientific significance. The measurement of thermal conductivity has always attracted the attention of the majority of scientific researchers. With the advancement of technology, a variety of new porous powder materials have appeared one after another. Effective measurement of thermal conductivity of these materials is of great significance for their a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 凌晨王建立张梦瑶付明月李小芳
Owner SOUTHEAST UNIV
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