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BS ISO 17170-2015

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BS ISO 17170-2015

BSI Standards Publication BS ISO 171702015 Fine ceramics advanced ceramics, advanced technical ceramics Test method for spherical indentation of porous ceramicsBS ISO 171702015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 171702015. 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 not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. ublished by BSI Standards Limited 2015 ISBN 978 0 580 76490 5 ICS 81.060.30 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2015. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 171702015 ISO 2015 Fine ceramics advanced ceramics, advanced technical ceramics Test method for spherical indentation of porous ceramics Cramiques techniques Mthode d’essai d’indentation des cramiques poreuses avec un indenteur sphrique INTERNATIONAL STANDARD ISO 17170 First edition 2015-12-15 Reference number ISO 171702015EBS ISO 171702015ISO 171702015Eii ISO 2015 – All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland All 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, 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 ISO’s member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. 41 22 749 01 11 Fax 41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 171702015ISO 171702015EForeword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Test specimens 2 4.1 Specimen size . 2 4.2 Specimen preparation 2 4.3 Number of specimens . 2 5 Testing machine and equipment 2 5.1 Testing machine . 2 5.2 Spherical indenter 3 5.3 Pedestal . 3 5.4 Micrometer calipers . 3 5.5 Dial gauges 3 5.6 Humidity measuring device . 3 6 Testing method . 3 6.1 Measurement of specimen dimension 3 6.2 Specimen positioning and loading method 3 6.3 Crosshead speed 4 6.4 Measurement of load and load-point displacement . 4 6.5 Reuse of pedestal 5 6.6 Measurement of temperature and humidity . 5 6.7 Reuse of spherical indenter . 5 6.8 Number of tests 5 7 Treatment of test result. 5 7.1 Load vs. load-point displacement curve . 5 7.2 Strength of spherical indentation . 5 7.3 Calculation of mean value and standard variation 6 8 Test report . 6 8.1 Items to be reported . 6 8.2 Items preferred to be reported . 6 ISO 2015 – All rights reserved iii Contents PageBS ISO 171702015ISO 171702015E 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 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 Commission 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 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 identifying 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 convenience 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 ISO’s adherence to the WTO principles in the Technical Barriers to Trade TBT see the following URL Foreword - Supplementary information The committee responsible for this document is ISO/TC 206, Fine ceramics.iv ISO 2015 – All rights reservedBS ISO 171702015INTERNATIONAL ST ANDARD ISO 171702015E Fine ceramics advanced ceramics, advanced technical ceramics Test method for spherical indentation of porous ceramics 1 Scope This International Standard describes the test methods for determining spherical indentation strength of porous ceramics, such as those employed for filters and catalyst carriers, that are carried out in air at room temperature. 2 Normative references The 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 references, the latest edition of the referenced document including any amendments applies. ISO 463, Geometrical Product Specifications GPS Dimensional measuring equipment Design and metrological characteristics of mechanical dial gauges ISO 683-1, Heat-treatable steels, alloy steels and free-cutting steels Part 1 Non-alloy steels for quenching and tempering ISO 683-3, Heat-treatable steels, alloy steels and free-cutting steels Part 3 Case-hardening steels ISO 1101, Geometrical product specifications GPS Geometrical tolerancing Tolerances of form, orientation, location and run-out ISO 3290-1, Rolling bearings Balls Part 1 Steel balls ISO 3611, Geometrical product specifications GPS Dimensional measuring equipment Micrometers for external measurements Design and metrological characteristics ISO 4287, Geometrical Product Specifications GPS Surface texture Profile method Terms, definitions and surface texture parameters ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1 Tension/compression testing machines Verification and calibration of the force-measuring system 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 porous ceramics ceramics with porosity of 30 to 60 , and pore diameter of 1 μm to 100 μm, for applications such as filters, catalyst carriers, humidity sensors, or molecular sieves, excluding structured honeycomb cellular channels 3.2 spherical indenter sphere through which a compressive load is applied to the specimen ISO 2015 – All rights reserved 1BS ISO 171702015ISO 171702015E 3.3 fracture by spherical indentation fracture is the separation of a specimen into more than two pieces, or many small flakes or powder-like pieces, accompanied by a large drop or disappearance of force 3.4 strength by spherical indentation maximum load measured in the period from start of test to the fracture of the test specimen when the compressive load is applied to the specimen through the spherical indenter 4 Test specimens 4.1 Specimen size The shape of a test specimen shall be a flat plate with a regular square cross section. Its standard dimensions shall be 20,0 mm 0,1 mm in horizontal length, 20,0 mm 0,1 mm in vertical length, and 10,0 mm 0,1 mm in thickness. The parallelism between the upper and lower surfaces of the specimen shall be at most 0,01 mm specified in ISO 1101. When the dimensions are different from the standard one, they shall be stated in a report. d Key d vertical length d 20,0 mm 0,1 mm w horizontal length w 20,0 mm 0,1 mm t thickness t 10,0 mm 0,1 mm Figure 1 Specimen dimensions 4.2 Specimen preparation The specimen surface shall be finished by grinding with a wheel whose grain number is at least 800. Contamination by fixatives e.g. wax or grinding fluids employed during grinding processes, if any, should be removed by organic dissolution, or by heating at a sufficiently high temperature. 4.3 Number of specimens The number of specimens shall be at least 10. 5 Testing machine and equipment 5.1 Testing machine A testing machine 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 2 ISO 2015 – All rights reservedBS ISO 171702015ISO 171702015E or indicating the load with an accuracy of at most 1 of the maximum load in accordance with ISO 7500-1 or have better precision. 5.2 Spherical indenter A steel sphere with 3/4 inch 19,05 mm or 19 mm diameter specified in ISO 3290-1 shall be used as an indenter. 5.3 Pedestal A pedestal placed below the specimen shall be made of carbon steel for mechanical use with a carbon content of 0,4 to 0,6 defined by in ISO 683-1 and ISO 683-3 or materials with the hardness over 150 Hv. The thickness of the pedestal shall be at least 10 mm, and the surface area of the pedestal contacting with the specimen is at least four times of the specimen cross-section area. The surface of the pedestal contacting the specimen shall be at most Ra 0,40 μm determined in accordance with ISO 4287, and the parallelism shall be at most 0,01 mm specified in ISO 1101. 5.4 Micrometer calipers Micrometer calipers shall be those for external measurement in accordance with ISO 3611 or have better precision. 5.5 Dial gauges Dial gauges shall be those with a scale of 0,01 mm in accordance with ISO 463 or have a better precision. 5.6 Humidity measuring device Humidity measuring device shall be equipped with a performance measuring or indicating the humidity with an accuracy of at most 5 RH. 6 Testing method 6.1 Measurement of specimen dimension The horizontal and vertical lengths and thickness of the specimen shall be measured to a precision of 0,01 mm by using micrometer calipers for external measurement or a measuring instrument at least equal in precision thereto. 6.2 Specimen positioning and loading method The specimen is positioned at the centre of the pedestal. The central axis of the pedestal, specimen and spherical indenter are aligned along the load line. The specimen shall be loaded by forcing the spherical indenter into the test specimen. Figure 2 illustrates a testing setup. ISO 2015 – All rights reserved 3BS ISO 171702015ISO 171702015E 7 6 5 4 3 2 1 Key 1 loading jig 2 scattering prevention cover 3 spherical folder 4 spherical indenter 5 test specimen 6 pedestal 7 base of testing machine Figure 2 Testing setup for small spherical indentation 6.3 Crosshead speed The crosshead speed shall be 0,5 mm/min. 6.4 Measurement of load and load-point displacement Load and load-point displacement shall be measured from the start of the test to the specimen fracture. The load point displacement shall be measured with a displacement meter such as an electronic dial gauge or transducer, as shown in Figure 3, or from the crosshead displacement of testing machine.4 ISO 2015 – All rights reservedBS ISO 171702015ISO 171702015E 1 2 3 Key 1 dial gauge 2 support of dial gauge 3 contact plate for load point displacement Figure 3 Measurement of load-point displacement 6.5 Reuse of pedestal When the pedestal is reused, dimples or flaws shall be completely removed. 6.6 Measurement of temperature and humidity When indentation tests are carried out, the temperature and humidity of the test environment shall be measured. 6.7 Reuse of spherical indenter If a spherical indenter is to be reused, inspect it for damage. If dimples or flaws have been generated by prior use, an unused region of the sphere shall be used as the contact area with the test specimen. 6.8 Number of tests The minimum number of successful tests shall be 10. Test specimens shall be used only for a single test. 7 Treatment of test result 7.1 Load vs. load-point displacement curve A load vs. load-point displacement curve shall be drawn from the start of the test to the fracture of the test specimen. 7.2 Strength of spherical indentation The maximum load which is determined from load vs. load-point displacement curve shall be the strength of spherical indentation. Also, the load-point displacement at the maximum load shall be recorded. ISO 2015 – All rights reserved 5BS ISO 171702015ISO 171702015E 7.3 Calculation of mean value and standard variation The mean value and the standard deviation of the fracture strength by spherical indentation shall be calculated using Formulae 1 and 2, and rounded to three significant figures          11               2 wherex i indentation fracture strength of each specimen N;x mean of indentation fracture strength N;S standard deviation of indentation fracture strength N;n number of specimens. 8 Test report 8.1 Items to be reported The test report shall include following items a the name and class of material; b the dimensions mean value of the specimen; c the material and diameter of the spherical indenter; d the name of testing machine and its type; e the material and dimension of pedestal; f the loading condition crosshead speed; g the conditions of temperature and humidity at test; h the number of specimens tested; i the list of test results indentation fracture strength and its load point displacement; j the mean and standard variation of indentation fracture strength; k the load vs. load-point displacement curves; l a reference to this International Standard, i.e. ISO 17170. 8.2 Items preferred to be reported Where appropriate, the following items may supplement the test report a the manufacturer’s name of material and its date of manufacture; b the name of material, kinds of additive, and sintering method; c the porosity and mean pore size of material;6 ISO 2015 – All rights reservedBS ISO 171702015ISO 171702015E d the chemical composition of material; e the sampling conditions of specimen from material and its machining conditions when a specimen is heat treated, its conditions are included; f the mechanical properties of material such as bending strength, elastic modulus, fracture toughness value, etc.; g the date of test, test place, and name of test person. ISO 2015 – All rights reserved 7BS ISO 171702015ISO 171702015E ISO 2015 –

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