1、BS ISO 20343:2017Fine ceramics (advancedceramics, advanced technicalceramics) Test method fordetermining elastic modulusof thick ceramic coatings atelevated temperatureBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 20343:2017 BRITISH STANDARDNational foreword
2、This British Standard is the UK implementation of ISO 20343:2017.The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does no
3、t purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 89641 5 ICS 81.060.30 Compliance with a British Standard cannot confer immunity from legal
4、obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 20343:2017 ISO 2017Fine ceramics (advanced ceramics, advanced technical ceramics) Tes
5、t method for determining elastic modulus of thick ceramic coatings at elevated temperatureCramiques techniques Mthode dessai relative la dtermination du module lastique des revtements de cramique pais temprature leveINTERNATIONAL STANDARDISO20343First edition2017-01Reference numberISO 20343:2017(E)B
6、S ISO 20343:2017ISO 20343:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll 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, i
7、ncluding 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 officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandT
8、el. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 20343:2017ISO 20343:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Apparatus . 25.1 Elastic modulus testing machine . 25.2 Heating system 25.2.1 General 25.2.2 Temperature stabil
9、ity 25.2.3 Test temperature uniformity . 25.2.4 Furnace heating rate . 25.2.5 Furnace stability. 25.3 Temperature measuring and indicating instruments . 25.3.1 General 25.3.2 Thermocouples . 35.3.3 Verification of the thermocouple temperature measuring system 35.4 Dimension-measuring device. 35.5 Te
10、st fixture 35.5.1 General 35.5.2 Fixture material 36 Test pieces . 36.1 Test piece size 36.2 Test piece preparation and storage . 47 Test procedure 47.1 Measurement of the size and mass of the test-pieces . 47.2 Measurement of elastic modulus of coating at elevated temperature 48 Calculation of resu
11、lts . 68.1 Standard formula for elastic modulus of coating 68.2 Mean value and standard deviation for elastic modulus 68.3 Variation of elastic modulus with temperature 79 Analysis of precision and uncertainty 810 Test report . 8Bibliography 9 ISO 2017 All rights reserved iiiContents PageBS ISO 2034
12、3:2017ISO 20343:2017(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
13、 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 Commissio
14、n (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
15、 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
16、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 convenie
17、nce 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 World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the
18、following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.iv ISO 2017 All rights reservedBS ISO 20343:2017INTERNATIONAL STANDARD ISO 20343:2017(E)Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for determining
19、elastic modulus of thick ceramic coatings at elevated temperature1 ScopeThis document specifies a method of test for determining the elastic modulus of thick ceramic monolayer coatings (thickness 0,03 mm) at elevated temperatures, using the impulse excitation method. Procedures for test piece prepar
20、ation, test modes and rates (load rate or displacement), data collection, and reporting procedures are given.This document applies primarily to brittle ceramic coatings on ceramic or metal substrates. This test method can be used for material research, quality control, and characterization and desig
21、n data-generation purposes.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refe
22、renced document (including any amendments) applies.ISO 3611, Geometrical product specifications (GPS) Dimensional measuring equipment: Micrometers for external measurements Design and metrological characteristicsISO 17561, Fine ceramics (advanced ceramics, advanced technical ceramics) Test method fo
23、r elastic moduli of monolithic ceramics at room temperature by sonic resonanceIEC 60584-1, Thermocouples Part 1: EMF specifications and tolerances3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use
24、in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1elastic modulusratio of plane stress to plane strainNote 1 to entry: Also known as Youngs modulus.3.2flexural vibrationsvibrati
25、ons that occur when the displacements in a slender rod or bar are in a plane normal to the length dimension3.3thickness ratioratio of the coating thickness to the substrate thickness ISO 2017 All rights reserved 1BS ISO 20343:2017ISO 20343:2017(E)4 PrincipleThe elevated temperature elastic modulus o
26、f ceramic coatings on metal or ceramic substrates is deduced by comparing the elastic moduli of coated and uncoated samples, under the precondition that the interface between the coating and the substrate is continuous and without a debonding zone. The elastic modulus of ceramic coatings can be calc
27、ulated from three parameters, i.e. the elastic modulus of the uncoated sample or substrate (Es), equivalent elastic modulus of the coated sample (Eq), and the ratio of the coating thickness to the substrate thickness (R = h/H). The value of Eqand Esare determined by the impulse excitation technique.
28、5 Apparatus5.1 Elastic modulus testing machineA suitable impulse excitation testing system capable of applying impulses at elevated temperatures shall be used, which shall be in accordance with ISO 17561. Since the test piece is required by ISO 17561 to be homogeneous and isotropic, the measured mod
29、ulus using the coated test piece is then described as an equivalent elastic modulus.5.2 Heating system5.2.1 GeneralThe heating system, usually a furnace, shall be capable of heating the test fixture and test piece and maintaining a uniform and constant temperature during the impulse excitation test.
30、 The furnace shall have the capability for containing air, inert gas, or a vacuum environment as required for the test.5.2.2 Temperature stabilityThe furnace shall be controlled by a device capable of maintaining a constant temperature within 2 C or better within its working space during the time wh
31、en the elastic modulus of test pieces is being measured.5.2.3 Test temperature uniformityThe furnace shall be capable of maintaining a uniform test piece temperature. It shall previously be determined that the temperature of the test piece does not vary by more than 0,5 % of the test temperature aft
32、er a 15 min hold time at the required test temperature measured in C.5.2.4 Furnace heating rateThe furnace control device shall be capable of maintaining a heating rate of the furnace of 5 C/min to 10 C/min and preventing temperature overshoots.5.2.5 Furnace stabilityThe time for the system to reach
33、 thermal equilibrium at the test temperature shall be determined for the test temperature to be used.5.3 Temperature measuring and indicating instruments5.3.1 GeneralThe thermocouple temperature measuring equipment shall have a resolution of at least 1 C and an accuracy of 5 C or better. Optical pyr
34、ometers, if used, shall have a resolution of better than 5 C and an accuracy of 5 C or better.2 ISO 2017 All rights reservedBS ISO 20343:2017ISO 20343:2017(E)5.3.2 ThermocouplesThermocouples in accordance with IEC 60584-1 shall be used. The thermocouple shall exhibit low thermal inertia (the diamete
35、r of the wires shall not be greater than 0,5 mm). The measuring thermocouple tip shall be less than 2 mm from the test piece, but never contact the test piece.5.3.3 Verification of the thermocouple temperature measuring systemThermocouples shall be calibrated periodically against national standards
36、since calibration may drift with usage or contamination.5.4 Dimension-measuring deviceA Vernier caliper with a precision of 0,02 mm according to ISO 3611 should be used to measure the dimensions of the test piece. The thickness of the coating shall be measured by using a traceably calibrated optical
37、 or scanning electron microscope (SEM) with magnification of 1 000 times or better.5.5 Test fixture5.5.1 GeneralThe fixture shall be suitable for the installation of the test piece as recommended in ISO 17561 with platinum hanging wires and for impulse excitation and signal acquisition in the furnac
38、e. The fixture shall maintain the position of the test piece during the test.5.5.2 Fixture materialThe fixture shall be manufactured from a material that is inert under the testing conditions used. The fixture shall be oxidation-resistant if the testing is conducted in air. The fixture shall have ne
39、gligible chemical reaction with and shall not contaminate the test piece.6 Test pieces6.1 Test piece sizeA rectangular test bar with coating on one of the two largest faces only is required. The geometrical dimensions of the coated sample are displayed in Figure 1. The thickness ratio, R (R = h/H),
40、shall be larger than 1/100. For flexural resonance, the length of the specimen (L) shall be greater than 40 mm. The ratio of length to thickness of substrate, L/H, shall be greater than 20. The ratio of width to thickness of substrate, B/H, shall be in the range of 3 to 10. The parallelism tolerance
41、 on opposite longitudinal faces is 0,015 mm. Table 1 shows the recommended dimensions of a ceramic-coated test piece. The surface of the test piece shall be smooth and flat. The surface shall be ground using a fine grit (400 grit or finer). Any machining procedure used shall not affect the results.
42、The edges of the test piece shall not be chamfered.Key1 coating2 substrateFigure 1 Schematic illustration of the rectangular test pieces ISO 2017 All rights reserved 3BS ISO 20343:2017ISO 20343:2017(E)Table 1 Recommended dimensions for coated test pieceDimensions in millimetresDimension Description
43、Value ToleranceL Length of the bar 40 0,5B Width of the bar 8 to 20 0,1H + h Total thickness of the bar 2 to 4 0,05An approximate ratio for L:B:(H + h) = 20:5:1 is recommended for elastic modulus measurement of thick ceramic coating with h 0,03 mm and 1 h/H 0,01.6.2 Test piece preparation and storag
44、eThe test pieces may be obtained using one of the two approaches.a) The test pieces are cut from some coated components, carefully grinding and polishing the test piece to keep the surfaces parallel and flat.b) The test pieces are prepared by coating a substrate; in this case, the modulus of the sub
45、strate shall be measured before depositing the coating. The detailed test procedure is described below. Before applying the coating, mark each test piece substrate with a unique identifier which will be visible after coating. Measure the flatness of each uncoated test piece, for example, by mounting
46、 in an unstressed state on the x-y stage of a calibrated optical microscope and measuring the z coordinate of the surface with an accuracy of 2 m at 10 equally spaced positions along its length. Record the results for each test piece.The test pieces shall be handled carefully to avoid the introducti
47、on of damage after test piece preparation. The test pieces shall be stored separately and not allowed to impact or scratch each other.A minimum of 5 test pieces is required for the test.7 Test procedure7.1 Measurement of the size and mass of the test-piecesDry the test pieces until their mass is con
48、stant. Weigh each of the test pieces to the nearest 1 mg or 0,1 % (whichever is greater) using a calibrate scale. Measure the length of coated test piece to the nearest 0,05 mm or 0,1 % (whichever is greater). Measure the thickness of coating and the substrate to nearest 0,001 mm or 0,1 % (whichever
49、 is greater).Measure the dimensions of the test pieces using a Vernier caliper complying with ISO 3611 and with precision of 0,02 mm or better, or other calibrated measuring device providing the same or better measurement accuracy. Measure the width and thickness at three points along its length according to 5.5 (at the middle and two ends of the bar) and determine the average of the three measurements. Coating thickness shall be measured by using a calibrated optical or scanning electron microscope (SEM) with
