DIN EN ISO 14604-2016 Fine ceramics (advanced ceramics advanced technical ceramics) - Methods of test for ceramic coatings - Determination of fracture strain (ISO 14604 2012) Germa.pdf

1、October 2016 English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 81.060.30!%)“2579906www.din.deDI

2、N EN ISO 14604Fine ceramics (advanced ceramics, advanced technical ceramics) Methods of test for ceramic coatings Determination of fracture strain (ISO 14604:2012);English version EN ISO 14604:2016,English translation of DIN EN ISO 14604:2016-10Hochleistungskeramik Verfahren zur Prfung keramischer S

3、chichten Bestimmung der Bruchdehnung (ISO 14604:2012);Englische Fassung EN ISO 14604:2016,Englische bersetzung von DIN EN ISO 14604:2016-10Cramiques techniques Mthodes dessai des revtements cramiques Dtermination de la dformation la rupture (ISO 14604:2012);Version anglaise EN ISO 14604:2016,Traduct

4、ion anglaise de DIN EN ISO 14604:2016-10SupersedesDIN EN 10719:200910www.beuth.deDocument comprises 18 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.10.16 DIN EN ISO 14604:2016-10 2 A comma is used as the decimal marker. Nati

5、onal foreword The text of ISO 14604:2012 has been prepared by Technical Committee ISO/TC 206 “Fine ceramics” and has been taken over as EN ISO 14604:2016 by Technical Committee CEN/TC 184 “Advanced technical ceramics” (Secretariat: DIN, Germany). At present a DIN committee does not exist for this st

6、andard since the parties concerned have not shown any interest in work on the subject. The European Standards EN 10002-1 and EN 10002-5 listed in Clause 21 have been replaced by EN ISO 6892-1 and EN ISO 6892-2, which are available as DIN EN ISO Standards. The DIN Standards corresponding to the Inter

7、national Standards referred to in this document are as follows: ISO 9513 DIN EN ISO 9513 ISO 14577-4:2007 DIN EN ISO 14577-4:2007-08 Amendments This standard differs from DIN EN 1071-9:2009-10 as follows: a) a further paragraph has been added to the Introduction; b) the figures have been placed afte

8、r Clause 8 “Test report”; c) ISO 14604:2012 has been adopted. Previous editions DIN CEN/TS 1071-9: 2004-04 DIN EN 1071-9: 2009-10 National Annex NA (informative) Bibliography DIN EN ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperature DIN EN ISO 6892-2, Metallic

9、materials Tensile testing Part 2: Method of test at elevated temperature DIN EN ISO 9513, Metallic materials Calibration of extensometer systems used in uniaxial testing DIN EN ISO 14577-4:2007-08, Metallic materials Instrumented indentation test for hardness and materials parameters Part 4: Test me

10、thod for metallic and non-metallic coatings (ISO 14577-4:2007) EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14604 April 2016 ICS 81.060.30 Supersedes EN 1071-9:2009English Version Fine ceramics (advanced ceramics, advanced technical ceramics) - Methods of test for ceramic coatings - Dete

11、rmination of fracture strain (ISO 14604:2012) Cramiques techniques - Mthodes dessai des revtements cramiques - Dtermination de la dformation la rupture (ISO 14604:2012) Hochleistungskeramik - Verfahren zur Prfung keramischer Schichten - Bestimmung der Bruchdehnung (ISO 14604:2012) This European Stan

12、dard was approved by CEN on 25 March 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations 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 s

13、uch national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This 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 o

14、wn language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,

15、 Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORM

16、UNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14604:2016 EContents PageEuropean foreword .3Introduction 51 Scope . 62 Normative references 63 Terms and

17、 definitions . 64 Significance and use 75 Principle 76 Apparatus and materials 76.1 Instrumentation . 76.2 Specimen preparation 87 Test procedure 97.1 Calibration 97.2 Sample loading 97.3 Strain determination 97.4 Crack detection 107.5 Test parameters . 118 Test report 11Bibliography .16DIN EN ISO 1

18、4604:2016-10 EN ISO 14604:2016 (E)2Foreword 4European foreword The text of ISO 14604:2012 has been prepared by Technical Committee ISO/TC 206 “Fine ceramics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 14604:2016 by Technical Committee CEN/TC 184 “Ad

19、vanced technical ceramics” the secretariat of which is held by DIN. 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 October 2016, and conflicting national standards shall be withdrawn at the lates

20、t by October 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 1071-9:2009. According to the CEN-CENEL

21、EC 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, Ice

22、land, 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 14604:2012 has been approved by CEN as EN ISO 14604:2016 without any modificat

23、ion. DIN EN ISO 14604:2016-10 EN ISO 14604:2016 (E) 3 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. E

24、ach 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Internati

25、onal Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standard

26、s adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of

27、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 14604 was prepared by Technical Committee ISO/TC 206, Fine ceramics.DIN EN ISO 14604:2016-10 EN ISO 14604:2016 (E)4 IntroductionThe fracture strain of a coating is a critical factor often determining

28、the performance of a coated product. Clearly, if stressed either directly or due to thermal effects (thermal expansion coefficient mismatch between the coating and substrate) coating cracking can occur if the critical fracture stress/strain is exceeded, and in many cases the effectiveness of the coa

29、ting will be reduced. For example, corrosion-resistant coatings loose their protective character if cracking occurs, and optical coatings become ineffective when cracked. In many cases, cracking is the first stage of a much more serious form of failure in which large areas of the coating can spall.T

30、his International Standard describes a method for the determination of fracture strain using a technique of applying stresses to a coupon of material by a uniaxial tensile or compressive test or a beam bending test where the initiation of fracture in the coating is determined using an acoustic emiss

31、ion method.The extent to which coated components can withstand external applied loads is an important property in the application of any coated system, and usually the failure stress is required. For calculation of the stress, both the fracture strain and Youngs modulus of the coating should be know

32、n. ISO 14577-4:20071can be used to measure Youngs modulus by depth-sensing indentation, but there are other methods involving flexure and impact excitation that may also be applied (References 2, 3).DIN EN ISO 14604:2016-10 EN ISO 14604:2016 (E) 5 1 ScopeThis International Standard describes a metho

33、d of measuring the fracture strain of ceramic coatings by means of uniaxial tension or compression tests coupled with acoustic emission to monitor the onset of cracking of the coating. Tensile or compressive strains can also be applied by flexure using four-point bending. Measurements can be made in

34、 favourable cases at elevated temperatures as well as at room temperature.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference

35、d document (including any amendments) applies.EN 10002-1, Metallic materials Tensile testing Part 1: Method of test at ambient temperatureEN 10002-5, Metallic materials Tensile testing Part 5: Method of test at elevated temperatureISO 12106, Metallic materials Fatigue testing Axial-strain-controlled

36、 method3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1fracture strainstrain required to create a detectable crack in the coatingNOTE The presence of the crack can be detected using optical or scanning electron microscopy, or indirectly using ac

37、oustic emission3.2acoustic emissionAEgeneration of acoustic signalsNOTE See Figure 1 for definition of AE signals. AE signals are recorded as hits, counts, energy or amplitude (3.3, 3.4, 3.5 and 3.6).3.3AE hitsingle acoustic event above a set threshold3.4AE energyarea of the waveform of an AE hit3.5

38、AE amplitudepeak of the waveform of an AE hitDIN EN ISO 14604:2016-10 EN ISO 14604:2016 (E)6 3.6AE thresholdarbitrary AE amplitude at which AE hits are deemed to be significant and above the AE signals generated by the test equipment3.7AE countsnumber of times the AE waveform passes a set threshold

39、within a single hit3.8waveguidemetallic wire connecting (usually by spot welding) the sample to the AE transducer4 Significance and useThis test procedure covers the measurement of fracture strain in tension or compression in coatings subject to mechanical stress at ambient or elevated temperature.T

40、he method is applicable to cases where the substrate is sufficiently ductile such that fracture of the coating occurs before the substrate. In addition, if during plastic deformation of the substrate acoustic signals are generated, this may interfere with those caused by coating fracture. Where poss

41、ible, it is recommended that a test be carried out with the uncoated substrate to determine whether such extraneous AE signals occur.5 PrincipleSpecimens of appropriate geometry are submitted to a mechanical stress; the subsequent strain is measured and the onset of coating failure is detected. The

42、test draws upon the expertise of standard tensile and compressive tests but requires additional care due to the precision required of the measurements. The applied stress may be tensile or compressive and may be applied directly or in flexure. The test shall be carried out to satisfy the requirement

43、s of accepted standards for mechanical testing of materials under the selected method of loading.NOTE 1 Detection of the fracture of coatings can be carried out in a number of ways. The most convenient is to use acoustic emission (AE), which allows continuous monitoring of the specimen. Acoustic sig

44、nals are produced when a crack forms. These signals are captured using suitable detectors and the signals generated are then analysed. In many cases, a waveguide is used to carry the signal from the specimen to the detector; this waveguide is normally a metallic material. Use of two AE detectors can

45、 help to eliminate extraneous signals coming from the loading mechanism. Commercially available AE systems can be used for this work.NOTE 2 Where AE cannot be used, crack detection is possible by high-resolution video systems, which may allow continuous monitoring. Alternatively, optical or scanning

46、 electron microscopy can be used to examine the samples. Normally this is done post-test, but in situ examination is also possible.6 Apparatus and materials6.1 Instrumentation6.1.1 In simplest terms, the equipment required is a mechanism to apply load to the specimen; extensometry to measure the str

47、ain; and apparatus to detect/monitor fracture of the surface layer. Load is normally applied continuously through servo-electric testing machines; the load capacity of the frame should be sufficient to allow straining of the specimen to beyond the yield point of the substrate material. Continuation

48、of the test to complete separation of the specimen is not normally required.6.1.2 For flexural testing, a suitable test jig is required; four-point bending is recommended as this applies more uniform bending moment over the gauge length. A suitable jig is shown in Figure 2.DIN EN ISO 14604:2016-10 EN ISO 14604:2016 (E) 7 6.1.3 Extensometry should