ASTM D5930-17 Standard Test Method for Thermal Conductivity of Plastics by Means of a Transient Line-Source Technique.pdf
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1、Designation: D5930 17Standard Test Method forThermal Conductivity of Plastics by Means of a TransientLine-Source Technique1This standard is issued under the fixed designation D5930; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, t
2、he year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the thermalconductivity of plastics over a temperature range f
3、rom 40 to400C. It is possible to measure the thermal conductivity offilled and unfilled thermoplastics, thermosets, and rubbers inthe range from 0.08 to 2.0 W/m.K.1.2 The values stated in SI units shall be regarded asstandard.1.3 This standard does not purport to address the safetyconcerns, if any,
4、associated with its use. It is the responsibilityof the user of this standard to establish proper safety andhealth practices and determine the applicability of regulatorylimitations prior to use.NOTE 1There is no known ISO equivalent to this test method.1.4 This international standard was developed
5、in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents
6、2.1 ASTM Standards:2C177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC1113 Test Method for Thermal Conducti
7、vity of Refracto-ries by Hot Wire (Platinum Resistance ThermometerTechnique)D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD2717 Test Method for Thermal Conductivity of LiquidsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE1225 Test
8、 Method for Thermal Conductivity of SolidsUsing the Guarded-Comparative-Longitudinal Heat FlowTechnique3. Terminology3.1 DefinitionsTerminology used in this standard is inaccordance with Terminology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 temperature transient, nthe temperature
9、 rise associ-ated with the perturbation of a system, initially at a uniformtemperature. The system does not attain thermal equilibriumduring the transient.3.2.2 thermal conductivity, nthe time rate of steady heatflow/unit area through unit thickness of a homogeneous mate-rial in a direction perpendi
10、cular to the surface induced by a unittemperature difference.3.2.2.1 DiscussionWhere other modes of heat transfer arepresent in addition to conduction, such as convection andradiation, this property often is referred to as the apparentthermal conductivity, app.3.2.2.2 DiscussionThermal conductivity
11、must be associ-ated with the conditions under which it is measured, such astemperature and pressure, as well as the compositional varia-tion of the material. It is possible that thermal conductivity willvary with direction and orientation of the specimen since somematerials are not isotropic with re
12、spect to thermal conductivity.In the case of thermoset polymers, it is possible that thermalconductivity will vary with the extent of cure.3.2.3 thermal diffusivitya heat-transport property given bythe thermal conductivity divided by the thermal mass, which isa product of the density and the heat ca
13、pacity.3.3 Symbols:3.3.1 CProbe constant.3.3.2 Thermal conductivity, W/m.K.3.3.3 QHeat output per unit length, W/m.3.3.4 T2The temperature (K) recorded at time t2.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on T
14、hermal Properties.Current edition approved Aug. 1, 2017. Published August 2017. Originallyapproved in 1997. Last previous edition approved in 2016 as D5930 - 16. DOI:10.1520/D5930-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.
15、org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
16、This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade
17、 (TBT) Committee.13.3.5 T1The temperature (K) recorded at time t1.3.4 Subscript:3.4.1 avaverage.3.4.2 appapparent.3.4.3 refreference.4. Summary of Test Method4.1 Line-Source TechniqueThis is a transient method fordetermining thermal conductivity (1, 2).3A line source of heatis located at the center
18、of the specimen being tested. Theapparatus is at a constant initial temperature. During the courseof the measurement, a known amount of heat produced by theline-source results in a heat wave propagating radially into thespecimen. The rate of heat propagation is related to the thermaldiffusivity of t
19、he polymer. The temperature rise of the line-source varies linearly with the logarithm of time (3).Itispossible to use this relationship to directly calculate the thermalconductivity of the sample. There are a number of ways toachieve the line source of heat. In this test method, it is in theform of
20、 a probe as described in 7.2.5. Significance and Use5.1 The relative simplicity of the test method makes itapplicable for a wide range of materials (4, 5). The techniqueis capable of fast measurements, making it possible to take databefore the materials suffer thermal degradation. Alternatively,it i
21、s possible to study the effect of compositional changes suchas chemical reaction or aging (6). Short measurement timespermit generation of large amounts of data with little effort.The line-source probe and the accompanying test specimen aresmall in size, making it possible to subject the sample to a
22、 widerange of test conditions. Because this test method does notcontain a numerical precision and bias statement, it shall not beused as a referee test method in case of dispute.6. Interferences6.1 The line-source method produces results of highestprecision with materials where intimate contact with
23、 the probehas been established, thereby eliminating effects of thermalcontact resistance. These materials include viscous fluids andsoft solids.6.1.1 Thermal-Contact ResistanceIn the solid state, it ispossible that a contact resistance is developed due to theinterface between the specimen and the me
24、asuring device.Conventional methods attempt to account for this by introduc-ing a conductive paste between the specimen and the sensor.This reduces, but some effect of contact resistance is stillpossible. In the line-source method, contact resistance mani-fests itself as a nonlinearity in the initia
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