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Process for determining thermoconductivity

A technology of thermal conductivity and heating rate, which is applied in the field of instrument analysis and can solve problems such as complex calculation formulas and single functions of instruments and equipment.

Inactive Publication Date: 2011-10-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] At present, whether it is a steady-state method or an unsteady-state method, a specific instrument must be manufactured according to the corresponding principle, and the function of this special instrument is relatively single.
[0015] U.S. Patent US005335993 provides a method for measuring the thermal conductivity of materials using a modulated differential scanning calorimeter, but the calculation formula of that method is complicated and requires a lot of known data, such as the density of the sample, the heat capacity of the sample , the specific heat of the sample, etc., which will bring a lot of inconvenience to the actual test work

Method used

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  • Process for determining thermoconductivity
  • Process for determining thermoconductivity
  • Process for determining thermoconductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Embodiment 1 measures the thermal conductivity of aluminum (the thermal conductivity of known aluminum is 238W.m -1 .K -1 ).

[0079] A small piece of indium is selected as the standard sample, and the standard sample is tested together with the platinum crucible. The DSC test uses a vacuum atmosphere, the temperature range is 300K to 480K, and the heating rate is 0.0833K / s. The model of the differential scanning calorimeter we choose is For the NETZSCH synchronous thermal analyzer STA449C, the DSC curve related to the thermal conductivity is in the temperature range from 400K to 470K, and a DSC curve is obtained through the test, such as Figure 6 shown.

[0080] Then make the aluminum block of the sample to be tested into H=3.13mm, and the cross-sectional area S=2.98mm 2 The column is placed between the platinum crucible with the standard sample and the instrument crucible, and the DSC test of the aluminum block sample is carried out according to the same condition...

Embodiment 2

[0087] Embodiment 2 measures the thermal conductivity of aluminum (the thermal conductivity of known aluminum is 238W.m -1 .K -1 ).

[0088] A small piece of indium is selected as the standard sample, and the standard sample is tested together with the platinum crucible. The DSC test uses a vacuum atmosphere, the temperature range is 300K to 480K, and the heating rate is 0.167K / s. The model of the differential scanning calorimeter we choose is For the NETZSCH synchronous thermal analyzer STA449C, the DSC curve related to the thermal conductivity is in the temperature range from 400K to 470K, and a DSC curve A is obtained through the test, such as Figure 8 shown.

[0089] Then make the aluminum block of the sample to be tested into H=3.13mm, and the cross-sectional area S=2.98mm 2 The column is placed between the platinum crucible with the standard sample and the instrument crucible, and the DSC test of the aluminum block sample is carried out under the same conditions as t...

Embodiment 3

[0096] Embodiment 3 measures the thermal conductivity of brass (the thermal conductivity of known brass is 10 W.m -1 .K -1 ).

[0097] A small piece of indium is selected as the standard sample, and the standard sample is tested together with the platinum crucible. The DSC test uses a vacuum atmosphere, the temperature range is 300K to 480K, and the heating rate is 0.0833K / s. The model of the differential scanning calorimeter we choose is For the NETZSCH synchronous thermal analyzer STA449C, the DSC curve related to thermal conductivity is in the temperature range from 400K to 470K, and a DSC curve C is obtained through the test, such as Figure 9 shown.

[0098] Then the brass sample to be tested is made into a certain shape, the sample to be tested is H=3.13mm, and the cross-sectional area S=2.98mm 2 The column is placed between the platinum crucible with the standard sample and the instrument crucible, and the DSC test of the brass sample is carried out under the same co...

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Abstract

The invention discloses a method for testing thermal conductivity by utilizing a differential scanning calorimeter, and the method comprises the following steps of: selecting one or a plurality of standard samples, putting samples under test between the standard samples and a crucible of the differential scanning calorimeter for testing, and comparing the measured results when putting the samplesunder test on the crucible with the measured results without putting the samples under test on the crucible to obtain the thermal conductivity of material. The method in the invention has the advantages of easy operation, low cost and accurate results, and belongs to the instrumental analysis field.

Description

technical field [0001] The invention relates to the field of instrumental analysis, and more specifically relates to a method for measuring thermal conductivity, that is, a method for measuring thermal conductivity by using a differential scanning calorimeter. Background technique [0002] There are many ways to measure thermal conductivity. Hu Jing of Dalian University of Technology's "(Measurement and Research on Thermal Conductivity of Dielectric Thin Films) introduces the steady-state method and unsteady-state method to measure the thermal conductivity of the sample to be tested. [0003] 1. Steady state method [0004] The steady-state method is to determine the thermal conductivity of the sample material by measuring the heat flowing through the sample, temperature gradient, etc. after the sample reaches thermal stability. One-dimensional heat flow steady-state method is commonly used, and its basic test formula is: [0005] κ = B ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20G06F19/00
Inventor 盛允胡刚
Owner BYD CO LTD