BS ISO 16525-4-2014 Adhesives Test methods for isotropic electrically conductive adhesives Determination of shear strength and electrical resistance using rigid-to-rigid bonded ass.pdf

1、BSI Standards PublicationBS ISO 16525-4:2014Adhesives Test methods for isotropic electrically conductive adhesivesPart 4: Determination of shear strength and electrical resistance using rigid-to-rigid bonded assembliesBS ISO 16525-4:2014 BRITISH STANDARDNational forewordThis British Standard is the

2、UK implementation of ISO 16525-4:2014. The UK participation 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 provis

3、ions of a contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 76956 6 ICS 83.180Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published u

4、nder the authority of the Standards Policy and Strategy Committee on 31 May 2014.Amendments issued since publicationDate Text affectedBS ISO 16525-4:2014 ISO 2014Adhesives Test methods for isotropic electrically conductive adhesives Part 4: Determination of shear strength and electrical resistance u

5、sing rigid-to-rigid bonded assembliesAdhsifs Mthodes dessai pour adhsifs conductivit lectrique isotrope Partie 4: Dtermination de la rsistance au cisaillement et de la rsistance lectrique des assemblages colls rigide sur rigideINTERNATIONAL STANDARDISO16525-4First edition2014-05-15Reference numberIS

6、O 16525-4:2014(E)BS ISO 16525-4:2014ISO 16525-4:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, inclu

7、ding 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 member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22

8、749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 16525-4:2014ISO 16525-4:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Apparatus and materials 25 Specimen . 26 Tests . 36.1 Atmospheric cond

9、itions 36.2 Procedure 37 Test report . 4Annex A (normative) Apparatus for shear strength tests 5Annex B (normative) Procedure of shear strength tests . 7Bibliography 9BS ISO 16525-4:2014ISO 16525-4:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of n

10、ational 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 subject for which a technical committee has been established has the right to be represented on that committee. Inter

11、national organizations, governmental 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 inte

12、nded 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 be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso

13、.org/directivesAttention 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 identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be

14、 in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny 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, Subcommitt

15、ee SC 11, Products.ISO 16525 consists of the following parts, under the general title Adhesives Test methods for isotropic electrically conductve adhesives: Part 1: General test methods Part 2: Determination of electric characteristics for use in electronic assemblies Part 3: Determination of heat-t

16、ransfer properties Part 4: Determination 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 Par

17、t 9: Determination of high-speed signal-transmission characteristicsiv ISO 2014 All rights reservedBS ISO 16525-4:2014INTERNATIONAL STANDARD ISO 16525-4:2014(E)Adhesives Test methods for isotropic electrically conductive adhesives Part 4: Determination of shear strength and electrical resistance usi

18、ng rigid-to-rigid bonded assembliesSAFETY STATEMENT Persons using this part of ISO 16525 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 establi

19、sh appropriate safety and health practices and to ensure compliance with any regulatory 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. Refer

20、ence should be made to appropriate documentation on safe handling and disposal after use.1 ScopeThis part of ISO 16525 specifies test methods using miniature specimens to determine shear strength and electrical resistance of a bonded joint that consists of isotropic electrically conductive adhesives

21、 and rigid adherends in specified conditions.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 edition of

22、the referenced document (including any amendments) applies.ISO 291, Plastics Standard atmospheres for conditioning and testingISO 431, Copper refinery shapesISO 472, Plastics VocabularyISO 10365, Adhesives Designation of main failure patternsISO 17212, Structural adhesives Guidelines for the surface

23、 preparation of metals and plastics prior to adhesive bonding3 Terms and definitionsFor the purposes of this document, the terms and definitions in ISO 472 and the following apply.3.1displacement ratecrosshead speed of the test machine, i.e. a jig, which applies the load to the isotropic electricall

24、y conductive adhesive layer during the shear strength test ISO 2014 All rights reserved 1BS ISO 16525-4:2014ISO 16525-4:2014(E)4 Apparatus and materials4.1 Apparatus for shear fatigue tests, consisting of a tensile machine, a specimen-holder jig, an ohmmeter, and a recorder. The specifications shall

25、 comply with the specifications of test apparatus specified in Annex A.4.2 Ohmmeter, to measure the electrical resistance of the specimens, based on the drop of potential method (four-terminal operation) or the equivalent.4.3 Shearing jig, for shear strength testing of specimens, as specified in Ann

26、ex A, unless otherwise specified in the product specifications.4.4 Stereoscopic microscope, magnification from 50x to 250x with a light that illuminates the specimen at luminance around 2 000 lx.4.5 Adherend, class 2 oxygen-free copper as specified in ISO 431, unless otherwise specified in the produ

27、ct specifications.5 SpecimenUse a specimen that is equal in form and dimensions with the adherend, as shown in Figure 1.If the dimensions of the specimen are different from those shown in Figure 1, interpretation of results might be difficult because adhesion strength cannot be compared.Bonding of t

28、he adherend using an isotropic electrically conductive adhesive shall be undertaken as follows.a) Treat the surface to be bonded in accordance with manufacturers instructions or ISO 17212. Report the method of surface treatment.b) Join a lead wire to the end face of the adherend to measure electrica

29、l resistance.c) Apply the isotropic electrically conductive adhesive to the adherend. Fix and bond them so that the thickness of the joint equals the dimension shown in Figure 1. For application and the curing of the adhesives, follow the adhesive manufacturers recommendations. If the product specif

30、ications do not refer to curing, carry out curing at 150 C for 30 min in the atmosphere.d) Use a jig to maintain the gap and alignment between the copper rods when bonding.2 ISO 2014 All rights reservedBS ISO 16525-4:2014ISO 16525-4:2014(E)Dimensions in millimetres210 2 1450,0531Key1 copper rod2 cop

31、per wire3 conductive adhesiveFigure 1 Miniature joint specimen6 Tests6.1 Atmospheric conditionsWhere possible, use the test atmospheric conditions specified in ISO 291. If alternative atmospheric conditions are used (upon mutual agreement between the delivering and receiving parties), record the tem

32、perature and humidity used in the test report.6.2 ProcedureAfter the pretreatment, observe the bonded portions; using a stereoscopic microscope specified in 4.4, check that there are no cracks or defects. Then, follow the procedure below unless otherwise specified. Details of the test procedure for

33、measuring the shear strength of an assembly bonded with an isotropic electrically conductive adhesive are given in Annex B.a) Fix the specimen to the fixing jig and connect it to the ohmmeter.b) Set a rate of loading (or displacement rate) and test temperature.c) Continue the shear test until a frac

34、ture is detected, record the shear force and electrical resistance, and calculate the shear strength.d) Observe the fracture, if necessary, to confirm and record the fracture mode in accordance with ISO 10365. ISO 2014 All rights reserved 3BS ISO 16525-4:2014ISO 16525-4:2014(E)7 Test reportThe test

35、report shall contain the following items. Some items may be selected from items b) through l) upon agreement between the delivering and receiving parties:a) a reference to this part of ISO 16525, i.e. ISO 16525-4;b) the name of the isotropic electrically conductive adhesive and its data, including k

36、inds of resin, filler material, manufacturers code and lot number;c) requirements of the adherend, including material and surface treatment;d) application method of the isotropic electrically conductive adhesive, curing time or setting time, temperature and pressure of the adhesive procedure;e) dime

37、nsions of the specimens, and the form and dimensions of the adhesive layer after bonding;f) model numbers of the shear strength test apparatus and ohmmeter;g) details of fixation of specimens (illustration preferred);h) adjustment of the pretest conditions and test atmospheric conditions;i) the disp

38、lacement rate or the rate of loading, if load-controlled testing is carried out;j) shear strength and electrical resistance of specimens;k) modes of fracture after the test in accordance with ISO 10365;l) the date, institution and atmospheric conditions of the test.4 ISO 2014 All rights reservedBS I

39、SO 16525-4:2014ISO 16525-4:2014(E)Annex A (normative) Apparatus for shear strength testsA.1 GeneralThis annex specifies the apparatus for shear strength testing of specimens specified in 4.1, and specifies its detailed requirements.A.2 Apparatus for shear strength testsA.2.1 Apparatus for tensile te

40、stsFor the measurement of shear strength, use apparatus that meets the following requirements unless otherwise specified in the product specifications.a) The displacement rate with respect to the specimen jig shall be constant.The test apparatus should preferably be equipped with a linear DC motor o

41、r piezoelectric actuator so that displacement can be controlled within the micro-meter range.b) Maintain constant displacement in the vicinity of the specimen using a displacement detector installed on the specimen jig. The displacement detector should preferably have noncontact eddy current and cap

42、acitance to avoid influencing the shear force.c) The test apparatus should have a load indicator to measure and record the force of reaction, which is generated by the shearing deformation of the adhesive layer during test.d) Choose a load indicator that makes it possible to break the microscopic sp

43、ecimen in the range from 10 % to 80 % of the full capacity, so that the adhesion of the miniature specimen can be measured precisely.e) When increasing temperature for the test, the test apparatus should be able to control the temperature.A.2.2 Shearing jig, having a structure that can fix the speci

44、men and apply shear strain to the bonded portion by mechanical displacement. The structure of shear jig should preferably be able to secure the adherend. The fixing jig should be designed so that the line of force is located at the centre of the specimen to inhibit bending deformation. Figure A.1 sh

45、ows an example of a fixing jig. ISO 2014 All rights reserved 5BS ISO 16525-4:2014ISO 16525-4:2014(E)4231Key1 screw2 actuator3 specimen4 load cellFigure A.1 Example of fixing jigA.2.3 Ohmmeter.When measuring changes in electrical resistance during a shearing test, it is preferable to use a low-resist

46、ance ohmmeter that is based on the drop of potential method and is therefore not influenced by resistance of the lead wires, so that small changes in resistance of the isotropic electrically conductive adhesive layer can be measured.A.2.4 Recorder, to document the relationship between the shear forc

47、e and displacement through testing.6 ISO 2014 All rights reservedBS ISO 16525-4:2014ISO 16525-4:2014(E)Annex B (normative) Procedure of shear strength testsB.1 GeneralThis annex specifies the procedure of shear strength tests of specimens specified in 6.2.B.2 Procedure of shear strength tests for th

48、e bonded portion of the isotropic electrically conductive adhesiveB.2.1 GeneralFollow the procedure below unless otherwise specified in the product specifications.B.2.2 Methoda) Fix a specimen to the jig. Ensure that the pressure to fix the specimen can be controlled using a tool such as a torque dr

49、iver, so that pressure can be constant and avoid influencing rigidity during the test. When tightening a screw, it is preferable that there is no force generated in the specimen with the load controlled during the test so as to prevent physical damage flaws in the adhesive layer.b) Connect the terminals of the ohmmeter to the lead wires of the specimen for measuring electrical resistance.c) When the test apparatus is equipped with a temperature controller, set a test temperature. Note that tempera