TECHNICAL ISO/TR REPORT 26946 First edition 2011-11-15 Standard method for porosity measurement of thermally sprayed coatings Methode normalisée de mesure de la porosite des revetements obtenus par projection thermique Reference number ISO/TR26946:2011(E) @ ISO 2011 ISO/TR 26946:2011(E) COPYRIGHT PROTECTED DOCUMENT @ ISO2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2011 - All riahts reserved ISO/TR 26946:2011(E) Contents Page Foreword 1 Scope. 2 3 Classification 4 Principle .. 5 Apparatus 6 Metallographic preparation .. 6.1 General 6.2 Sectioning 6.3 Cleaning 6.4 Mounting .. 6.5 Grinding and polishing 7 Metallography procedure... 8 Presentation of porosity .. .6 9 Test report.. Annex A (informative) List of ta. values with different n and α values.. Annex B (informative) Report of an international round robin test on the determination of porosity in plasma sprayed ceramic coatings by using image analysis of metallographically prepared cross sections.... .9 B.1 Introduction.... B.2 Scheme of the round robin test... B.2.1 .9 B.2.2 Sample preparation.. .9 B.2.3 Guideline of procedures for porosity measurement 10 B.3 Resultsanddiscussion 11 B.3.1 Initial results .. B.3.2 Second round test carried out in Japan... 12 B.4 Reassessment of the round robin tests by the grinding/polishing conditions 15 B.5 SEM imaging mode ... B.6 Summary 19 ahtsreserved ii