1、BSI Standards PublicationBS ISO 16525-3:2014Adhesives Test methods for isotropic electrically conductive adhesivesPart 3: Determination of heat-transfer propertiesBS ISO 16525-3:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 16525-3:2014. The UK participa
2、tion in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its corre
3、ct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 74569 0 ICS 83.180 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strateg
4、y Committee on 31 May 2014.Amendments issued since publicationDate Text affectedBS ISO 16525-3:2014 ISO 2014Adhesives Test methods for isotropic electrically conductive adhesives Part 3: Determination of heat-transfer propertiesAdhsifs Mthodes dessai pour adhsifs conductivit lectrique isotrope Parti
5、e 3: Dtermination des proprits de transfert de chaleurINTERNATIONAL STANDARDISO16525-3First edition2014-05-15Reference numberISO 16525-3:2014(E)BS ISO 16525-3:2014ISO 16525-3:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, n
6、o part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs memb
7、er body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 16525-3:2014ISO 16525-3:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope
8、 . 12 Normative references 13 Terms and definitions . 24 Principle 35 Scope of test . 36 Apparatus . 47 Cartridge-type specimen 67.1 The cartridge-type specimen 67.2 Dimensions and tolerances of the cartridge-type specimen . 67.3 Preparation of the cartridge-type specimen . 88 Standard rod . 98.1 Sh
9、ape of standard rods 98.2 Dimensions and tolerance of standard rods 98.3 Material and thermal conductivity of standard rods . 98.4 Surface roughness and flatness of the contact surface of the standard rods and parallelism of the upper/lower faces . 108.5 Boring thermocouple holes through the standar
10、d rods .109 Procedure119.1 Assembly of the cartridge-type specimen and the standard rod .119.2 Heating or cooling procedure of the cartridge-type specimen and the standard rod 119.3 Temperature measurement of the cartridge-type specimen and the standard rods 1110 Calculation of heat transfer propert
11、y 1110.1 Effective thermal conductivity . 1110.2 Thermal resistance . 1410.3 Thermal conductance . 1511 Test report 15Bibliography .16BS ISO 16525-3:2014ISO 16525-3:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO mem
12、ber bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmen
13、tal and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance
14、are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives.Attention is draw
15、n 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 identifying 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 t
16、he ISO list of patent declarations received. www.iso.org/patents.Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 11, Products.ISO 16525 co
17、nsists of the following parts, under the general title Adhesives Test methods for isotropic electrically conductive adhesives: Part 1: General test methods Part 2: Determination of electric characteristics for use in electronic assemblies Part 3: Determination of heat-transfer properties Part 4: Det
18、ermination of shear strength and electrical resistance using rigid-to-rigid bonded assemblies Part 5: Determination of shear fatigue Part 6: Determination of pendulum-type shear impact Part 7: Environmental test methods Part 8: Electrochemical migration test methods Part 9: Determination of high-spe
19、ed signal-transmission characteristicsiv ISO 2014 All rights reservedBS ISO 16525-3:2014INTERNATIONAL STANDARD ISO 16525-3:2014(E)Adhesives Test methods for isotropic electrically conductive adhesives Part 3: Determination of heat-transfer propertiesSAFETY STATEMENT Persons using this part of ISO 16
20、525 should be familiar with normal laboratory practice. This part of ISO 16525 does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulato
21、ry conditions. IMPORTANT Certain procedures specified in this part of ISO 16525 might involve the use or generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after
22、 use.1 ScopeThis part of ISO 16525 specifies test methods for heat-transfer properties such as effective thermal conductivity and thermal resistance by a steady-state comparative longitudinal heat-flow method (SCHF method) using cartridge-type specimen for isotropic electrically conductive adhesives
23、 used in wiring, die attach, and surface assembly.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest editio
24、n of the referenced document (including any amendments) applies.ISO 3611, Geometrical product specifications (GPS) Dimensional measuring equipment: Micrometers for external measurements Design and metrological characteristicsISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile
25、 method Terms, definitions and surface texture parametersISO 13385-1, Geometrical product specifications (GPS) Dimensional measuring equipment Part 1: Callipers; Design and metrological characteristicsISO 13385-2, Geometrical product specifications (GPS) Dimensional measuring equipment Part 2: Calli
26、per depth gauges; Design and metrological characteristicsISO 17212, Structural adhesives Guidelines for the surface preparation of metals and plastics prior to adhesive bondingISO 80000-1, Quantities and units Part 1: GeneralIEC 60584-1, Thermocouples Part 1: Reference tables ISO 2014 All rights res
27、erved 1BS ISO 16525-3:2014ISO 16525-3:2014(E)3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.NOTE Thermal conductivity of heterogeneous materials is called “apparent thermal conductivity”, “equivalent thermal conductivity” or “effective thermal con
28、ductivity”. For those materials whose compositions are nearly homogeneous, “thermal conductivity” can be used if it does not lead to confusion.3.1heat flow rateQamount of themal energy transferring from/to one system from/to another in a given timeNote 1 to entry: It is expressed in watts (W).3.2hea
29、t flow rate over surface areaheat fluxqamount of themal energy being transferred over a given surface areaNote 1 to entry: It is expressed in watts per square metre (W/m2).3.3heat transfer propertycollective term for thermal resistance, thermal conductivity, effective thermal conductivity and therma
30、l conductance3.4thermal resistanceRtemperature difference between the front and back sides in the steady-state divided by heat fluxNote 1 to entry: It is expressed in square metre kelvin per watt (m2K/W).Note 2 to entry: This parameter indicates how heat is transferred, with a high value denoting re
31、duced heat transfer.3.5thermal conductanceKheat flux in the steady state divided by the temperature difference between front and back sidesNote 1 to entry: It is expressed in watt per square metre kelvin (W/m2K).Note 2 to entry: The reciprocal of thermal resistance.3.6thermal conductivitykproportion
32、ality coefficient that represents the relationship of heat flux and temperature gradient, where heat flux on an isothermal surface is proportional to the temperature gradient in the normal direction on the isothermal surfaceNote 1 to entry: It is expressed in watt per metre kelvin (W/mK).2 ISO 2014
33、All rights reservedBS ISO 16525-3:2014ISO 16525-3:2014(E)3.7effective thermal conductivitykeffheat flux in the steady state that is divided by a temperature difference between the front and back sides, and multiplied by the distance between the front and back sides, LNote 1 to entry: It is expressed
34、 in watt per metre kelvin (W/mK).Note 2 to entry: Effective thermal conductivity includes interfacial thermal resistance.Note 3 to entry: It is expressed by K x L.3.8interfacial thermal resistanceRispecific type of thermal resistance arising on the contact surface of the material (contact thermal re
35、sistance), where thermal resistance caused by heat conduction of the filling between a gap and the material is removedNote 1 to entry: It is expressed in square metre kelvin per watt (m2K/W).Note 2 to entry: It is generated mainly between the surface of the material and the contact surface.3.9mean t
36、emperature of specimenTmarithmetic mean of temperatures of the high-temperature surface and the low-temperature surface of a specimen in the steady stateNote 1 to entry: It is expressed in kelvin (K).Note 2 to entry: It is simply called mean temperature.4 PrincipleEffective thermal conductivity of i
37、sotropic electrically conductive adhesives is measured by the steady-state temperature distribution in the cartridge-type specimen and standard rods under longitudinal heat-flow condition. The cartridge-type specimen is sandwiched by the standard rods made of square or cylindrical poles with known t
38、hermal conductivity.NOTE This method is called the steady-state comparative longitudinal heat-flow method (SCHF), which uses standard rods to measure heat flux, q, to calculate effective thermal conductivity. It is useful for isotropic electrically conductive adhesives whose thermal conductivity var
39、ies due to interfacial thermal resistance between the isotropic electrically conductive adhesive and the heating surface.5 Scope of testThe measurement range of thermal conductivity of an isotropic electrically conductive adhesive is determined by its thermal conductance. The lower and upper limits
40、of thermal conductance are calculated using Formulae (1) and (2), respectively.Ktwsrr276018514,(1)where25 tr 60, 10 wr 60 ISO 2014 All rights reserved 3BS ISO 16525-3:2014ISO 16525-3:2014(E)KKss100 000 205000 20()()kkkeffeffeff(2)whereKsis the thermal conductance of the isotropic electrically conduc
41、tive adhesive W/(m2.K)( = keff/ts);keffis the effective thermal conductivity of the isotropic electrically conductive adhesive W/(mK);tris the thickness of standard rods (mm);tsis the thickness of the isotropic electrically conductive adhesive (mm);Wris the length of the side of the specimen (mm).EX
42、AMPLE The lower limits of measurable thermal conductance of the isotropic electrically conductive adhesive with trof 25 mm are shown below:a) 2 000 W/(m2K), when Wr= 10 mm; b) 800 W/(m2K), when Wr= 20 mm;c) 400 W/(m2K), when Wr= 30 mm;d) 200 W/(m2K), when Wr= 60 mm.NOTE The upper limit of measureabl
43、e thermal conductance of the isotropic electrically conductive adhesive is shown below:a) 100 000 W/(m2K), when keff= 50 W/(mK);b) 100 000 W/(m2K), when keff= 30 W/(mK);c) 100 000 W/(m2K), when keff= 20 W/(mK);d) 50 000 W/(m2K), when keff= 10 W/(mK);e) 5 000 W/(m2K), when keff= 1 W/(mK);f) 2 500 W/(
44、m2K), when keff= 0,5 W/(mK).6 Apparatus6.1 Apparatus (general), consisting of measuring, heating, cooling and pressure-regulating devices. The cartridge-type specimen is sandwiched between the standard upper and lower rods with known thermal conductivity. Heat flows through the specimen longitudinal
45、ly. An example of the test apparatus is shown in Figure 1.4 ISO 2014 All rights reservedBS ISO 16525-3:2014ISO 16525-3:2014(E)FPLDMITCBCRLSCTGRRUBHBITCPGRCHKeyBC cooling block L load cellBH heating block M measurement systemBI insulating block P screw for pressure regulationCT cartridge-type specime
46、n RL lower rodC cooling equipment RU upper rodD data acquisition device S isotropic electrically conductive adhesivesF pressure adjustment unit TC thermocoupleGR thermal grease TCP holes for temperature measurementH heating equipment I thermal insulatorFigure 1 Example configuration of thermal condu
47、ctivity test apparatus by SCHF method6.2 Measurement system (M), consisting of a specimen (S), upper and lower rods (RU and RL), a heating block (BH) with a built-in heater, a cooling block (BC) and a thermal insulator (I), which covers these components. The upper/lower rods (RU/RL) and the specimen
48、 have thermocouple holes (TCPs) ISO 2014 All rights reserved 5BS ISO 16525-3:2014ISO 16525-3:2014(E)in which thermocouples (TCs) are inserted to measure the temperature gradient. The depth of each thermocouple hole is no smaller than 5 mm.The thermocouples are to measure the temperature distribution
49、 of the upper/lower rods (RU/RL) and specimen (S). Requirements for thermocouples are described below. When using thermoelectric devices, i.e. thermometers instead of thermocouples, they shall be equivalent to or surpass thermocouples in terms of performance.a) They shall be stable up to the temperature specified in IEC 60584;b) They shall have sufficient strength to be able to detect small fluctuations in temperature in a range where thermoelectromotive force
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