1、BSI Standards PublicationBS ISO 17841:2015Fine ceramics (advancedceramics, advanced technicalceramics) Test methodfor thermal fatigue of fineceramics substrateBS ISO 17841:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 17841:2015.The UK participation in i
2、ts preparation was entrusted to TechnicalCommittee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for it
3、s correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 80913 2ICS 81.060.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and St
4、rategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS ISO 17841:2015 ISO 2015Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for thermal fatigue of fine ceramics substrateCramiques techniques Mthode dessai de la fatigue thermique des su
5、bstrats des cramiques techniquesINTERNATIONAL STANDARDISO17841First edition2015-08-01Reference numberISO 17841:2015(E)BS ISO 17841:2015ISO 17841:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no pa
6、rt 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 member b
7、ody in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 17841:2015ISO 17841:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Testi
8、ng machine and equipment 24.1 Thermal cycling testing equipment 24.2 Four-point bending strength testing equipment . 24.3 Supports for four-point bending strength testing 24.4 Micrometre callipers 24.5 Vernier callipers . 25 Test specimens 25.1 Test specimen form and dimensions . 25.1.1 General 25.1
9、.2 Fine ceramics plate thickness t and metal plate thickness tm.25.2 Number of test specimens . 36 Testing methods 36.1 Test specimen dimension measurements . 36.2 Thermal fatigue (thermal cycling) testing methods . 36.2.1 Thermal fatigue (thermal cycling) conditions 46.2.2 Low-temperature tank insi
10、de TAand high-temperature tank inside TB46.2.3 Number of cycles in thermal fatigue N 46.2.4 Each exposure time t1to low temperature and high temperature 46.2.5 Transfer time t246.2.6 Temperature recovery time ts.46.2.7 Single cycle 56.3 Testing methods of four-point bending strength 56.3.1 Distance
11、between inner fulcrums (inner span) and distance between outer fulcrums (outer span) 56.3.2 Crosshead speed and fracture load 66.3.3 Measurement of load-displacement . 66.4 Four-point bending strength testing for virgin specimens not exposed to thermal cycling 67 Calculation of test results 77.1 Cal
12、culation of four-point bending strength 77.2 Calculation of mean values and standard deviations 77.3 Residual strength ratio . 77.3.1 Calculation of residual strength ratio 77.3.2 Residual strength ratio Thermal cycle number plots 88 Test report . 98.1 Items to be reported . 98.2 Additional items to
13、 be reported . 9Annex A (informative) Calculation of stress intensity factor at fracture .10Bibliography .15 ISO 2015 All rights reserved iiiContents PageBS ISO 17841:2015ISO 17841:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards
14、 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. International organiza
15、tions, 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 intended for its furt
16、her 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 (see www.iso.org/directiv
17、es).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 identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Int
18、roduction 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 convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to
19、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 - Supplementary informationThe committee responsible for this document is ISO/TC 206, Fine ceramics.iv ISO 2015 All rights reservedBS ISO
20、17841:2015INTERNATIONAL STANDARD ISO 17841:2015(E)Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for thermal fatigue of fine ceramics substrate1 ScopeThis International Standard describes the test methods for determining thermal fatigue property of fine ceramic substrates
21、 applied to power modules, electronic control unit and similar devices.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 referenc
22、es, the latest edition of the referenced document (including any amendments) applies.ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parametersISO 3611, Geometrical product specifications (GPS) Dimensional measuring equipment:
23、 Micrometers for external measurements Design and metrological characteristicsISO 13385-1, Geometrical product specifications (GPS) Dimensional measuring equipment Part 1: Callipers; Design and metrological characteristicsISO 80000-1, Quantities and units Part 1: General3 Terms and definitionsFor th
24、e purposes of this document, the following terms and definitions apply.3.1ceramic substrateelectrical circuits substrate which joined the metal plate to ceramics, applied to power modules and similar devices3.2thermal cyclingtemperature which is simply and cyclically repeated between a specific high
25、 value and a specific low value3.3four-point bending strengthmaximum value of stress generated in a test specimen obtained by a four-point bending test3.4residual strength ratiovalue (bb/0) of four-point bending strength of a test specimen exposed to thermal cycling (b) divided by the mean four-poin
26、t bending strength of test specimens not exposed to thermal cycling (N = 0) (b0) ISO 2015 All rights reserved 1BS ISO 17841:2015ISO 17841:2015(E)4 Testing machine and equipment4.1 Thermal cycling testing equipmentTwo types of thermal cycling equipment may be used. Type 1 provides two chambers one at
27、 a high temperature and the other at a low temperature and a means of moving the test specimen from one to the other within a specified time period. Type 2 provides a single chamber in which the temperature can be changed. The equipment shall be able to maintain the specified temperatures. Attachmen
28、ts and supports used with the test specimens shall have low thermal conductivity and the test specimens shall be thermally insulated. Test specimens shall be arranged so as not to disturb the circulation in the chambers and between specimens when multiple specimens are tested simultaneously.4.2 Four
29、-point bending strength testing equipmentThis testing equipment shall be so constructed that compressive stress can be applied to a test specimen at a constant crosshead speed. The testing machine shall be equipped with an apparatus measuring or indicating the load with an accuracy of at most 1 % of
30、 the maximum load.4.3 Supports for four-point bending strength testingFour-point flexure configurations measured four-point bending strength shall be used as illustrated in Figure 3. Supports wherein a testing specimen is supported as supporting points, or a load is applied to the specimen, shall be
31、 of the same shape in left and right and have a length exceeding a width of the specimen. The material of the supports shall be at least 147 GPa in elastic modulus, and free from plastic deformation and being broken midway through testing. The diameter of supports shall be 4,0 mm to 6,0 mm, and its
32、surface roughness shall be at most 0,40 m Ra as specified in ISO 4287. Also, supports should be able to be rotated and not to disturb the transformation of the test specimen by load.4.4 Micrometre callipersMicrometre callipers shall be those for external measurement specified in ISO 3611 or shall ha
33、ve better precision.4.5 Vernier callipersVernier callipers shall be those for external measurement specified in ISO 13385-1 or shall have better precision.5 Test specimens5.1 Test specimen form and dimensions5.1.1 GeneralThe shape of test specimens shall be two metal plates joined respectively to th
34、e front and back of a fine ceramics plate, i.e. a total of four metal sheets, as shown in Figure 1. The standard dimensions of the fine ceramics shall be: total length h = 40,0 mm, width w = (10,0 0,5) mm, and metal plate dimensions shall be: total length hm= 17,0 mm, width wm= (8,0 0,5) mm. Metal p
35、late spacing shall be d = 2 mm. The four corner portions of metal plates shall be chamfered to R = 1,0 mm, as shown in Figure 1. Any dimensions differing from the standard dimensions shall be mentioned in the test report.5.1.2 Fine ceramics plate thickness t and metal plate thickness tmFine ceramics
36、 plate thickness t and metal plate thickness tmshall follow product specifications, but in principle, t and tmshall be selected from the plate thicknesses listed in 5.1.2.1 and 5.1.2.2.2 ISO 2015 All rights reservedBS ISO 17841:2015ISO 17841:2015(E)5.1.2.1 Fine ceramic sheet thickness tThickness t =
37、 1,50 mm; 1,00 mm; 0,787 mm; 0,635 mm; 0,381 mm; 0,32 mm; 0,254 mm; 0,2 mm5.1.2.2 Metal plate thickness tmThickness tm= 0,6 mm; 0,4 mm; 0,3 mm; 0,25 mm; 0,2 mm; 0,125 mm5.2 Number of test specimensThe number of test specimens shall be 10 or more for each thermal cycle measuring four-point bending st
38、rength.dddhmhmhwmw8-R8-RtmttmKeyh length of ceramics (h = 40,0 mm)w width of ceramics (w = 10,0 mm 0,5 mm)t thickness of ceramics (t = 0,2 mm to 1,50 mm)hmlength of metal plate (hm= 17,0 mm)wmwidth of metal plate (wm= 8,0 mm 0,5 mm)tmthickness of metal plate (tm= 0,125 mm to 0,6 mm)d metal plate spa
39、cing (d = 2 mm)R chamfering (R = 1mm)Figure 1 Test specimen dimensions6 Testing methods6.1 Test specimen dimension measurementsThe horizontal and vertical lengths and thickness of the specimen shall be preliminarily measured in a precision of 0,01 mm by using micrometre callipers for external measur
40、ement specified in ISO 3611, Vernier callipers specified in ISO 13385-1 or a measuring instrument at least equal in precision thereto.6.2 Thermal fatigue (thermal cycling) testing methodsThermal fatigue (thermal cycling) testing shall be carried out after test specimen dimensions are measured. ISO 2
41、015 All rights reserved 3BS ISO 17841:2015ISO 17841:2015(E)6.2.1 Thermal fatigue (thermal cycling) conditionsThermal cycling (thermal cycling) conditions are established by combinations of low temperature TA, high temperature TB, exposure time t1, transfer time t2, temperature recovery time ts, and
42、number of cycles in thermal fatigue N.6.2.2 Low-temperature tank inside TAand high-temperature tank inside TBLow-temperature tank inside TAand high-temperature tank inside TBfollow product specifications (see Figure 2). TAand TBshall be also each selected from the testing temperatures listed in 6.2.
43、2.1 and 6.2.2.2 respectively.6.2.2.1 Low-temperature tank inside TATA= 65 C 2 C, 55 C 2C, 40 C 2 C, 25 C 2 C, 10 C 2 C, 5 C 2 C, +5 C 2 C6.2.2.2 High-temperature tank inside TBTB= +200 C 2 C, +175 C 2 C, +150 C 2 C, +125 C 2 C, +100 C 2 C, +85 C 2 C, +70 C 2 C, +55 C 2 C, +40 C 2 C, +30 C 2 C6.2.3 N
44、umber of cycles in thermal fatigue NNumber of cycles in thermal fatigue follows product specifications. Additionally, standard N shall be 0, 10, 100, 300, 1 000, and 3 000 cycles, and one or multiple N are selected from these cycles. Any other N number different from the standard values shall be men
45、tioned in the test report.6.2.4 Each exposure time t1to low temperature and high temperatureExposure time t1shall account for the heat capacity of the test specimen (see Figure 2). Additionally, standard t1shall be 30 min. Any other value of t1different from the standard values due to the heat capac
46、ity of the test specimen shall be mentioned in the test report.6.2.5 Transfer time t2Transfer time t2is the time for transferring test specimen from the low temperature tank to the high temperature tank, or from the high temperature tank to the low temperature tank, and should be kept as short as po
47、ssible due to the most severe temperature change for the test specimen (see Figure 2). Standard t2shall be selected from the following group. Any other value of t2different from the standard values shall be mentioned in the test report.a) t2 10 sb) 10 s t2 1 minc) 1 min t2 2 min6.2.6 Temperature rec
48、overy time tsTemperature recovery time tsis the time elapsed from test specimen placement in a tank to settling of the temperature in a tank to TAor TB, and tsshall be within 20 % of t1and is included in exposure time t1(see Figure 2). Any other value of tsdifferent from the standard values shall be
49、 mentioned in the test report.4 ISO 2015 All rights reservedBS ISO 17841:2015ISO 17841:2015(E)6.2.7 Single cycleA single cycle comprises two exposure times t1and two transfer times t2, as shown in Figure 1. Thermal cycling shall start in the low temperature tank, and shall end in the high temperature tank. The following sequence shall be repeated.a) Place the test specimen in the low temperature tank and maintain for the interval t1. Take tsa
