Measurement method and device of heat conductivity coefficients

A technology of thermal conductivity and measurement method, which is applied in the field of thermal conductivity material measurement, can solve the problems of inability to evaluate the thermal conductivity of products, consume a lot of time and cost, and achieve the effect of low requirements, low measurement cost and good data reproducibility

Inactive Publication Date: 2018-03-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in large-scale production and research and development, it is often necessary to test many samples. At this time, the following problems exist in the measurement of the thermal conductivity of the samples by the flash method: (1) For each sample, a separate sample preparation is required, which takes a lot of time (2) The thermal conductivity measured by the flash method can only represent the thermal conductivity of the test sample, and it cannot evaluate the thermal conductivity of the product as a whole

Method used

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  • Measurement method and device of heat conductivity coefficients
  • Measurement method and device of heat conductivity coefficients
  • Measurement method and device of heat conductivity coefficients

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3

[0044] (1) Preparation of the sample to be tested:

[0045] Select pure aluminum, pure magnesium, master alloy Al-50wt%Cu, Al-20wt%Si, Al-10wt%Mn as raw materials, and adopt conventional aluminum alloy ingot smelting methods to prepare alloy castings with the components and contents in Table 1. The ingot is prepared by die-casting method to prepare rectangular samples 1-3 with a length, width and height of 3×12.5×100 mm.

[0046] Table 1.

[0047] Sample to be tested

Al(wt%)

Si (wt%)

Cu(wt%)

Mg(wt%)

Mn(wt%)

1

margin

9

0.5

0.5

\

2

margin

8

\

0.5

\

3

margin

11

1

0.5

0.5

[0048] (2) The construction method of "time difference-thermal conductivity standard curve" is as follows:

[0049] The water temperature in the water bath heating pot in the aforementioned thermal conductivity measuring device is heated to 50°C, and then the standard sample is fixed by the test sample fixing part, so that one end of the standard sample extends to the fixed position in the water bath heating pot...

Embodiment 4 to 6

[0059] (1) Preparation of samples to be tested: Referring to Examples 1-3, prepare rectangular samples to be tested 4-6 with a length, width and height of 3×12.5×100mm. The components and contents of each sample to be tested are shown in Table 4. .

[0060] Table 4.

[0061] Sample to be tested

Al(wt%)

Si (wt%)

Cu(wt%)

Mg(wt%)

Mn(wt%)

4

margin

7

\

0.5

\

5

margin

10

1

\

\

6

margin

11

2

0.5

0.2

[0062] (2) The construction method of "time difference-thermal conductivity standard curve" is as follows:

[0063] Heat the water temperature in the water bath heating pot in the aforementioned thermal conductivity measuring device to 60°C, and then fix the standard sample through the test sample fixing part so that one end extends to the fixed position in the water bath heating pot; set from one end of the standard sample Start timing in the water bath heating pot and record the corresponding time when the other end of the standard reaches 25°C and 29°C. After the test is complete...

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Abstract

The invention discloses a measurement method and device of heat conductivity coefficients. The method comprises the following steps that 1, time difference needed by a group of standard samples with known heat conductivity coefficients to reach predetermined temperature difference in a heating process is measured, and according to the relationship between the measured time difference of the standard samples and the corresponding heat conductivity coefficients, a time difference-heat conductivity coefficient standard curve is built; 2, time difference needed by a sample to be measured to reachthe predetermined temperature difference in a heating process is measured, and according to the time difference-heat conductivity coefficient standard curve, the heat conductivity coefficient of the sample to be measured is converted. The structures of the standard samples and the sample to be measured are the same; the heating mode for measuring the time difference needed by the standard samplesand the sample to be measured to reach the predetermined temperature difference comprises the steps that one end of each standard sample or the sample to be measured is heated through a heat resource,and the temperature change of the other end of the standard sample or the sample to be measured is measured. By means of the method, the heat conductivity coefficients of material and a product can be fast measured at low costs.

Description

Technical field [0001] The invention relates to the field of thermal conductivity material measurement, in particular to a thermal conductivity measurement method and device. Background technique [0002] Thermally conductive materials / products have been designed for the heat conduction requirements of equipment in recent years, with excellent performance and reliability. They are suitable for various environments and requirements, have proper countermeasures to possible thermal conductivity problems, provide powerful help for the high integration of equipment, and ultra-small and ultra-thin. The thermally conductive materials / products have been increasingly applied to In many products, product reliability is improved. [0003] Thermal conductivity is an important index to characterize the thermal conductivity of thermally conductive materials / products. When studying the thermal conductivity of thermally conductive materials / products, it is usually necessary to measure. The curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 李运春张春萌郭强
Owner BYD CO LTD
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