1、BSI Standards PublicationBS EN ISO 22007-2:2015Plastics Determinationof thermal conductivity andthermal diffusivityPart 2: Transient plane heat source (hotdisc) methodBS EN ISO 22007-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO22007-2:2015. It supe
2、rsedes BS EN ISO 22007-2:2012 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/21, Testing of plastics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all th
3、e necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 77621 2ICS 83.080.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standar
4、d was published under the authority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 22007-2 August 2015 ICS 83.080.01 Supersedes EN ISO 22007-2:2012English Version Plastics -
5、 Determination of thermal conductivity and thermal diffusivity - Part 2: Transient plane heat source (hot disc) method (ISO 22007-2:2015) Plastiques - Dtermination de la conductivit thermique et de la diffusivit thermique - Partie 2: Mthode de la source plane transitoire (disque chaud) (ISO 22007-2:
6、2015) Kunststoffe - Bestimmung der Wrmeleitfhigkeit und der Temperaturleitfhigkeit - Teil 2: Transientes Flchenquellenverfahren (Hot-Disk-Verfahren) (ISO 22007-2:2015) This European Standard was approved by CEN on 20 June 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
7、s which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. Th
8、is European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN mem
9、bers are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portu
10、gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any fo
11、rm and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 22007-2:2015 EBS EN ISO 22007-2:2015EN ISO 22007-2:2015 (E) 3 European foreword This document (EN ISO 22007-2:2015) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee
12、 CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2016, and conflicting national standards shall be withdrawn at the latest b
13、y February 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 22007-2:2012. According to the CEN-CE
14、NELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary,
15、Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 22007-2:2015 has been approved by CEN as EN ISO 22007-2:2015 without any mo
16、dification. BS EN ISO 22007-2:2015ISO 22007-2:2015(E)Foreword ivIntroduction vi1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 35 Apparatus . 36 Test specimens 56.1 Bulk specimens . 56.2 Anisotropic bulk specimens 66.3 Slab specimens 66.4 Thin-film specimens . 77 Procedure.
17、 78 Calculation of thermal properties 98.1 Bulk specimens . 98.2 Anisotropic bulk specimens . 128.3 Slab specimens . 138.4 Thin-film specimens 148.5 Low thermally conducting specimens . 158.5.1 Introductory remarks .158.5.2 Low thermally conducting bulk specimens .158.5.3 Low thermally conducting an
18、isotropic bulk specimens .178.5.4 Low thermally conducting thinfilm specimen 179 Calibration and verification .179.1 Calibration of apparatus 179.2 Verification of apparatus . 1810 Precision and bias 1811 Test report 19Bibliography .20 ISO 2015 All rights reserved iiiContents PageBS EN ISO 22007-2:2
19、015ISO 22007-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a
20、subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission
21、 (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should
22、be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for ident
23、ifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the conveni
24、ence of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword -
25、Supplementary informationThe committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.This second edition cancels and replaces the first edition (ISO 22007-2:2008), which has been technically revised.The main changes are the following:a) Values
26、of thermal conductivity in scope revised;b) Sensitivity coefficient revised (3.3);c) Thickness range for thin-film specimens changed (6.4);d) Low thermally conducting specimens specified (8.5);e) Precision and bias adapted; (10.2);f) Bibliography extended;g) Normative references updated and standard
27、 editorial revised.ISO 22007 consists of the following parts, under the general title Plastics Determination of thermal conductivity and thermal diffusivity: Part 1: General principles Part 2: Transient plane heat source (hot disc) method Part 3: Temperature wave analysis method Part 4: Laser flash
28、method Part 5: Results of interlaboratory testing of poly(methyl methacrylate) samples Technical Reportiv ISO 2015 All rights reservedBS EN ISO 22007-2:2015ISO 22007-2:2015(E) Part 6: Comparative method for low thermal conductivities using a temperature-modulation technique ISO 2015 All rights reser
29、ved vBS EN ISO 22007-2:2015ISO 22007-2:2015(E)IntroductionA significant increase in the development and application of new and improved materials for broad ranges of physical, chemical, biological, and medical applications has necessitated better performance data from methods of measurement of therm
30、al-transport properties. The introduction of alternative methods that are relatively simple, fast, and of good precision would be of great benefit to the scientific and engineering communities. 1A number of measurement techniques described as transient methods have been developed and several have be
31、en commercialized. These are being widely used and are suitable for testing many types of material. In some cases, they can be used to measure several properties separately or simultaneously. 2,3A further advantage of some of these methods is that it has become possible to measure the true bulk prop
32、erties of a material. This feature stems from the possibility of eliminating the influence of the thermal contact resistance (see 8.1.1) that is present at the interface between the probe and the specimen surfaces. 1,3,4,5,6vi ISO 2015 All rights reservedBS EN ISO 22007-2:2015INTERNATIONAL STANDARD
33、ISO 22007-2:2015(E)Plastics Determination of thermal conductivity and thermal diffusivity Part 2: Transient plane heat source (hot disc) method1 ScopeThis part of ISO 22007 specifies a method for the determination of the thermal conductivity and thermal diffusivity, and hence the specific heat capac
34、ity per unit volume of plastics. The experimental arrangement can be designed to match different specimen sizes. Measurements can be made in gaseous and vacuum environments at a range of temperatures and pressures.This method is suitable for testing homogeneous and isotropic materials, as well as an
35、isotropic materials with a uniaxial structure. The homogeneity of the material extends throughout the specimen and no thermal barriers (except those next to the probe) are present within a range defined by the probing depth(s) (see 3.2 below).The method is suitable for materials having values of the
36、rmal conductivity, , in the approximate range 0,010 Wm1K1 500 Wm1K1, values of thermal diffusivity, , in the range 5 108m2s1 104m2s1, and for temperatures, T, in the approximate range 50 K T 1 000 K.NOTE 1 The specific heat capacity per unit volume, C, can be obtained by dividing the thermal conduct
37、ivity, , by the thermal diffusivity, , i.e. C = /, and is in the approximate range 0,005 MJm3K1 C 5 MJm3K1. It is also referred to as the volumetric heat capacity.NOTE 2 If the intention is to determine the thermal resistance or the apparent thermal conductivity in the through-thickness direction of
38、 an inhomogeneous product (for instance a fabricated panel) or an inhomogeneous slab of a material, reference is made to ISO 8301, ISO 8302, and ISO 472.The thermal-transport properties of liquids can also be determined, provided care is taken to minimize thermal convection.2 Normative referencesThe
39、 following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the cited edition applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 22007-1
40、, Plastics Determination of thermal conductivity and thermal diffusivity Part 1: General principles3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 22007-1 and the following apply.3.1penetration depthppenmeasure of how far into the specimen, in the dir
41、ection of heat flow, a heat wave has travelledNote 1 to entry: For this method, the penetration depth is given by ISO 2015 All rights reserved 1BS EN ISO 22007-2:2015ISO 22007-2:2015(E)ptpentot=wherettotis the total measurement time for the transient recording; is the thermal diffusivity of the spec
42、imen material; is a constant dependent on the sensitivity of the temperature recordings.Note 2 to entry: It is expressed in metres (m).3.2probing depthpprobmeasure of how far into the specimen, in the direction of heat flow, a heat wave has travelled during the time window used for calculationNote 1
43、 to entry: The probing depth is given byptprob=maxwheretmaxis the maximum time of the time window used for calculating the thermal-transport proper-ties.Note 2 to entry: It is expressed in metres (m).Note 3 to entry: A typical value in hot disc measurements is = 2, which is assumed throughout this p
44、art of ISO 22007.3.3sensitivity coefficientqcoefficient defined by the formulaqqTtq=()whereq is the thermal conductivity, , the thermal diffusivity, , or the volumetric specific heat capacity, C;T(t) is the mean temperature increase of the probe.Note 1 to entry: Different sensitivity coefficients ar
45、e defined for thermal conductivity, thermal diffusivity, and specific heat per unit volume.7Note 2 to entry: To define the time window that is used to determine both the thermal conductivity and diffusivity from one single experiment, the theory of sensitivity coefficients is used. Through this theo
46、ry, which deals with a large number of experiments and considers the constants, q, as variables, it has been established that0,30 tmax/r2 1,0where r is the mean radius of the outermost spiral of the probe.Assuming = 2, this expression can be rewritten as2 ISO 2015 All rights reservedBS EN ISO 22007-
47、2:2015ISO 22007-2:2015(E)1,1r pprob 2,0r4 PrincipleA specimen containing an embedded hot disc probe of negligible heat capacity is allowed to equilibrate at a given temperature. A heat pulse in the form of a stepwise function is produced by an electrical current through the probe to generate a dynam
48、ic temperature field within the specimen. The increase in the temperature of the probe is measured as a function of time. The probe operates as a temperature sensor unified with a heat source (i.e. a self-heated sensor). The response is then analysed in accordance with the model developed for the sp
49、ecific probe and the assumed boundary conditions.5 Apparatus5.1 A schematic diagram of the apparatus is shown in Figure 1.Key1 specimen with probe 5 bridge circuit2 chamber 6 voltmeter3 vacuum pump 7 voltage source4 thermostat 8 computerFigure 1 Basic layout of the apparatus5.2 A typical hot disc probe is shown in Figure 2. Convenient probes can be designed with diameters from 2 mm to 200 mm, depending on the specimen size and the thermal-transport p
