GB/T 8722-2019Test method for thermal conductivity of carbon materials (English PDF)
炭素材料导热系数测定方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 10, 2019
Implementation date
July 1, 2020
Scope
GB/T 8722-2019 is the English-translated version of 炭素材料导热系数测定方法.
GB/T 8722-2019 is the Chinese method for determining the thermal conductivity of carbon materials. It gives the terms and definitions, the principle, the equipment, the sample requirements, the test procedure, the calculation of results and the test report.
Two methods are described: the longitudinal heat flow method, used for bulk carbon materials between 100 °C and 800 °C, in which a direct current is passed through a cylindrical sample and the heat exchanged with the surroundings is corrected for, and the flash method.
For the first method it lists the measuring equipment, from the micrometer and the vernier caliper to the Ni-Cr-Ni-Si sheathed thermocouple, the digital temperature indicator, the DC digital voltmeter and the fixed shunt, with the accuracy required of each.
It replaces GB/T 8722-2008, was issued on 10 December 2019 and has applied since 1 July 2020.
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Document preview — GB/T 8722-2019
National Standard of the People's Republic of China
- ICS
- 29.050
- Classification
- Q 51
- Replacing
- GB/T 8722-2008
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Method 1. Longitudinal heat flow method
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 8722-2008 "Method for determination of medium-temperature thermal conductivity of graphite materials". Ratio, the main technical content changes are as follows.
--- Added terms and definitions (see Chapter 3);
--- Increased the direction of longitudinal heat flow sample sampling (see 4.4.1);
--- Modified the number of measurements of longitudinal heat flow test (see 4.5.6, 6.6 of the 2008 version);
--- Added flash method (see Chapter 5);
--- Modified the contents of the test report (see Chapter 6, Chapter 9 of the 2008 edition).
1 Scope
This standard specifies the terms and definitions of thermal conductivity of carbon materials, principles, equipment, sample requirements, test procedures, calculation of results, and tests. Reports, etc.
This standard applies to the determination of the thermal conductivity of carbon materials.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 1427 Carbon material sampling method
GB/T 8170 Numerical rounding rules and expression and judgment of limit values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Thermal conductivity
The heat transferred through the unit area of the material along the heat flow direction under the unit temperature gradient per unit time, which is used to characterize the thermal conductivity of the material ability.
4 Method 1. Longitudinal heat flow method
4.1 Scope
It is suitable for the measurement of thermal conductivity of bulk carbon materials at 100 °C ~ 800 °C.
4.2 Principle
Directly energized longitudinal heat flow method. When a cylindrical sample passes DC, the heat generated is mainly conducted along the longitudinal direction of the sample to both ends. Reach After thermal stability, it is considered that there is one-dimensional longitudinal heat flux on the sample, and the heat exchange between the sample and the lateral environment is corrected.
4.3 Equipment
4.3.1 Micrometer. range is 0mm ~ 25mm, accuracy is 0.01mm.
4.3.2 Vernier caliper. Accuracy is 0.02mm.
4.3.3 Ni-Cr-Ni-Si armored thermocouple. bare type. Thermocouple wire diameter 0.4mm ~ 0.5mm.
4.3.4 Precision digital temperature display instrument. resolution 0.1 °C, accuracy ± 1.3%.
4.3.5 DC digital voltmeter. resolution 0.001mV, accuracy ± 0.006%.
4.3.6 Fixed value shunt. 500A/75mV, class 0.2, with DC millivolt meter with corresponding accuracy. Or the digital voltmeter specified in 4.3.5.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
Similar standards
Editions of GB/T 8722
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 8722-2019 | Test method for thermal conductivity of carbon materials | current edition | Current |
| GB/T 8722-2008 | Test method for thermal conductivity of carbon materials | previous edition | Superseded |
This page sells the current edition, GB/T 8722-2019. Earlier editions are listed for reference only.
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