1、November 2016 English price group 12No 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!%uy“2588286www.din.de
2、DIN EN ISO 26424Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of the abrasion resistance of coatings by a microscale abrasion test (ISO 26424:2008);English version EN ISO 26424:2016,English translation of DIN EN ISO 26424:2016-11Hochleistungskeramik Bestimmung der Best
3、ndigkeit gegen Abrieb von Schichten durch eine Mikroabriebprfung (ISO 26424:2008);Englische Fassung EN ISO 26424:2016,Englische bersetzung von DIN EN ISO 26424:2016-11Cramiques techniques Dtermination de la rsistance labrasion des revtements par essai dabrasion microchelle (ISO 26424:2008);Version a
4、nglaise EN ISO 26424:2016,Traduction anglaise de DIN EN ISO 26424:2016-11SupersedesDIN EN 10716:200801www.beuth.deDocument comprises 21 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.11.16 DIN EN ISO 26424:2016-11 2 A comma is
5、 used as the decimal marker. National foreword The text of ISO 26424:2008 has been prepared by Technical Committee ISO/TC 206 “Fine ceramics” and has been taken over as EN ISO 26424:2016 by Technical Committee CEN/TC 184 “Advanced technical ceramics” (Secretariat: DIN, Germany). The responsible Germ
6、an body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Steering Committee NA 062 BR since the parties concerned have not shown any interest in work on the subject. The DIN Standard corresponding to the International Standard referred t
7、o in this document is as follows: ISO/IEC 17025 DIN EN ISO/IEC 17025 Amendments This standard differs from DIN EN 1071-6:2008-01 as follows: a) a number of NOTES have been incorporated as normative text, e.g. the NOTES in Subclause 8.2.2; b) in Subclause 8.3.7, the paragraph dealing with perforation
8、 has been rendered more precise; c) two footnotes have been included in Table 1; d) ISO 26424:2008 has been adopted. Previous editions DIN V ENV 1071-6: 2002-09 DIN EN 1071-6: 2008-01 National Annex NA (informative) Bibliography DIN EN ISO/IEC 17025, General requirements for the competence of testin
9、g and calibration laboratories EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 26424 April 2016 ICS 81.060.30 Supersedes EN 1071-6:2007English Version Fine ceramics (advanced ceramics, advanced technical ceramics) - Determination of the abrasion resistance of coatings by a micro-scale abras
10、ion test (ISO 26424:2008)Cramiques techniques - Dtermination de la rsistance labrasion des revtements par essai dabrasion micro-chelle (ISO 26424:2008) Hochleistungskeramik - Bestimmung der Bestndigkeit gegen Abrieb von Schichten durch eine Mikroabriebprfung (ISO 26424:2008) This European Standard w
11、as approved by CEN on 18 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 such na
12、tional 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 own lan
13、guage 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, Greec
14、e, 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 NORMUNG CE
15、N-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 26424:2016 EContents Page European foreword. 3 1 Scope . 5 2 Normative references . 5 3 Terms and definitions.
16、5 4 Significance and use 5 5 Principle. 6 6 Apparatus and materials 6 6.1 Test system . 6 6.2 Test balls . 6 6.3 Abrasive slurry 7 6.4 Measurement of crater dimensions 8 7 Preparation of test pieces 9 8 Test procedure 9 8.1 Different types of test. 9 8.1.1 Type A: no perforation of coating. 9 8.1.2
17、Type B: perforation of coating 9 8.2 Type A test: no perforation of coating 9 8.3 Type B test: perforation of coating. 11 9 Analysis of results 12 9.1 Type A test: no perforation of coating 12 9.1.1 Basic equations 12 9.1.2 Calculation of Kc. 13 9.2 Type B test: perforation of coating. 13 9.2.1 Basi
18、c equations 13 9.2.2 Calculation of Kcand Ks14 10 Test reproducibility, repeatability and limits . 14 10.1 Reproducibility and repeatability 14 10.2 Limits 15 11 Test report . 17 Annex A (informative) Measurement of coating thickness 18 Bibliography . 19 DIN EN ISO 26424:2016-11 EN ISO 26424:2016 (E
19、)2Foreword. 4 European foreword The text of ISO 26424:2008 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 26424:2016 by Technical Committee CEN/TC 184 “Advanced technical ceramics” the
20、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 latest by October 2016. Attention is
21、 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 1071-6:2007. According to the CEN-CENELEC Internal Regulations, the na
22、tional 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, Iceland, Ireland, Italy, Latvia, L
23、ithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 26424:2008 has been approved by CEN as EN ISO 26424:2016 without any modification. DIN EN ISO 26424:2016-11 E
24、N ISO 26424:2016 (E)3 Foreword ISO (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
25、 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
26、n (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 Standards adopted by the technical co
27、mmittees 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 patent rights. ISO shall no
28、t be held responsible for identifying any or all such patent rights. ISO 26424 was prepared by Technical Committee ISO/TC 206, Fine ceramics. DIN EN ISO 26424:2016-11 EN ISO 26424:2016 (E)4 1 Scope This International Standard specifies a method for measuring the abrasive wear rate of ceramic coating
29、s by means of a micro-scale abrasion wear test based on the well-known crater-grinding technique used for coating thickness determination in ISO 2642311. The method can provide data on both coating and substrate wear rates, either by performing two separate tests or by careful analysis of the data f
30、rom a single test series. The method can be applied to samples with planar or non-planar surfaces, but the results analysis described in Clause 9 applies only to flat samples. For non-planar samples, a more complicated analysis, possibly requiring the use of numerical methods, is required. 2 Normati
31、ve references The 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 referenced document (including any amendments) applies. ISO 3290-1, Rolling bearings Balls
32、Part 1: Steel balls ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 abrasive wear rate abrasive wear coefficient K volume of material removed in un
33、it sliding distance under a normal contact load of 1 N 4 Significance and use Although few protective coatings are subject to single wear processes, the abrasive wear resistance of such coatings can play a decisive role in their performance. Hence, knowledge of the abrasive wear resistance of cerami
34、c coatings can help in the proper selection of coatings for applications where abrasion plays a major role in their degradation. Although techniques exist to measure the abrasive wear behaviour of bulk materials and thick films (see References 1 to 3), these techniques are not easily applied to thin
35、 films and the results are difficult to interpret when the methods are used on curved surfaces. DIN EN ISO 26424:2016-11 EN ISO 26424:2016 (E)5 The purpose of this International Standard is to provide a method for measuring the abrasion resistance of both thin and thick coatings and of bulk material
36、s. The test can be carried out on flat surfaces or surfaces with a known radius of curvature and requires test pieces measuring only a few square millimetres. However, the calculations described in Clause 9 apply only to flat test pieces and are applicable only to homogeneous single-layer coatings.
37、Errors may occur if the test is used on inhomogeneous coatings. References 4 and 5 give details of analytical treatments for determining the wear rate of coatings on curved surfaces. By proper treatment of the results as indicated in 9.2, where the test produces penetration of the coating, it can pr
38、ovide abrasive wear coefficients for both the coating and the substrate from a single test series. Although the test is designed to allow quantitative measurement of abrasive wear coefficients, it can be adapted as a quality control test for use on real components. 5 Principle In the test, a ball is
39、 rotated whilst being pressed against the test piece, and an abrasive slurry is fed into the contact zone. A spherical depression is produced, and the size of this depression is measured. Where perforation of the coating does not occur, the wear rate of the coating can be obtained from a single crat
40、er. When perforation of the coating occurs, the wear rate of both the coating and the substrate can be calculated by making a series of such craters and measuring their dimensions. 6 Apparatus and materials 6.1 Test system A ball which can be rotated and pressed against the coated test piece shall b
41、e used. Two variants of the ball system are shown in Figure 1, where either the test piece, mounted on a deadweight-loaded lever, is pressed against a directly driven ball or the balls own weight presses it against the test piece. NOTE It has been found6that the results obtained with free-ball syste
42、ms see Figure 1 a) can vary depending on the precise system geometry. In particular, it has been found that the tilt angle of the test piece holder and the width of the groove in the drive shaft that supports the ball can have an important influence on the results. A tilt angle of 60 to 75 and a sha
43、ft groove width of 10 mm have been found to result in the smallest variability under typical conditions. The test system shall be constructed so that the rotational speed of the ball remains constant throughout any test and is reproducible to better than 10 % of the nominal value between tests. The
44、drive shaft shall have a total run-out of less than 20 m at the points of contact with the ball. 6.2 Test balls The balls used are typically 25-mm-diameter hardened steel, e.g. UNS G52986 (SAE 52100) and shall, prior to any conditioning, conform to the requirements of ISO 3290-1. NOTE 1 Balls can be
45、 used in a polished condition, but it has been found7that the test behaviour is erratic and poor results are obtained if balls are used without conditioning. The recommended conditioning treatment consists of running the new test ball for at least 300 revolutions on a non-critical part of the test p
46、iece, or another suitable surface, under normal test conditions and repeating this for at least five different orientations of the ball before starting the test programme. NOTE 2 A flat, ground steel coupon with a hardness of between 200 HV30 and 800 HV30 has been found to be suitable for conditioni
47、ng the ball. NOTE 3 Following conditioning, balls have been found to be usable for around 50 individual craters, depending on the precise conditions used. DIN EN ISO 26424:2016-11 EN ISO 26424:2016 (E)6 Balls shall be subjected to regular performance checks to ensure that they continue to produce ac
48、ceptable craters. Balls shall be replaced if such a check indicates any abnormal cratering behaviour. NOTE 4 Performance checks can be carried out using any suitable test piece, such as hardened and tempered high-speed steel, or a well-characterized titanium nitride or other coating deposited on a stable substrate material. a) Free-ball system b) Fixed-ball system Key 1 ball 5 load cell 2 test piece 6 weight 3 drive shaft 7
