1、 IEC 61788-12 Edition 2.0 2013-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 12: Matrix to superconductor volume ratio measurement Copper to non- copper volume ratio of Nb 3 Sn composite superconducting wires Supraconductivit Partie 12: Mesure du rapport volumique matrice/sup
2、raconducteur Rapport volumique cuivre/non-cuivre des fils en composite supraconducteur Nb 3 Sn IEC 61788-12:2013 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduce
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16、e publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61788-12 Edition 2.0 2013-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 12: Matrix to superconductor volume ratio measurement Copper to non- copper volume ratio of Nb 3 Sn composite superconducting wir
17、es Supraconductivit Partie 12: Mesure du rapport volumique matrice/supraconducteur Rapport volumique cuivre/non-cuivre des fils en composite supraconducteur Nb 3 Sn INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 29.050 PRICE CODE CODE PRIX ISBN 978-2-83220
18、-864-9 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via
19、 un distributeur agr. colour inside 2 61788-12 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Principle . 8 5 Apparatus . 8 6 Measurement procedure . 8 Preparation of specimen 8 6.1General . 8 6.1.1Procedures 8 6.1.2Measurement 9
20、6.2Photo of cross-section . 9 6.2.1Transfer . 9 6.2.2Cutting. 9 6.2.3Measurement of paper mass 9 6.2.4Test procedure for the second specimen . 9 6.3Paper mass . 9 6.4 7 Calculation of results 9 8 Uncertainty of the test method 10 9 Test report 10 Copper to non-copper volume ratio 10 9.1Identificatio
21、n of test specimen . 10 9.2 Annex A (normative) Measurement Image processing method . 11 Annex B (normative) Measurement Copper mass method 12 Annex C (normative) Measurement method using planimeter 13 Annex D (informative) Specimen polishing method . 14 Annex E (informative) Difference of the coppe
22、r to non-copper volume ratio before and after the Nb 3 Sn generation heat treatment process 15 Annex F (informative) Paper mass bias at copy 16 Annex G (informative) Cross-sections of Cu/Nb 3 Sn wires . 17 Annex H (informative) Uncertainty considerations . 18 Annex I (informative) Uncertainty evalua
23、tion in the test method of the copper to non-copper volume ratio of Nb 3 Sn composite superconducting wires 23 Figure G.1 Cross-sections of four Cu/Nb 3 Sn wire types according to the layout of the stabilizer . 17 61788-12 IEC:2013 3 Table H.1 Output signals from two nominally identical extensometer
24、s 19 Table H.2 Mean values of two output signals . 19 Table H.3 Experimental standard deviations of two output signals . 19 Table H.4 Standard uncertainties of two output signals 20 Table H.5 Coefficient of variations of two output signals 20 4 61788-12 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMIS
25、SION _ SUPERCONDUCTIVITY Part 12: Matrix to superconductor volume ratio measurement Copper to non-copper volume ratio of Nb 3 Sncomposite superconducting wires FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national elec
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35、 in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying
36、 any or all such patent rights. International Standard IEC 61788-12 has been prepared by IEC technical committee 90: Superconductivity. This second edition cancels and replaces the first edition published in 2002. It constitutes a technical revision. The main revision is the addition of two new anne
37、xes, “Uncertainty considerations“ (Annex H) and “Uncertainty evaluation in the test method of the copper to non-copper volume ratio of Nb 3 Sn composite superconducting wires“ (Annex I). The text of this standard is based on the following documents: FDIS Report on voting 90/322/FDIS 90/325/RVD Full
38、information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 61788-12 IEC:2013 5 A list of all parts of the IEC 61788 series, published under the gen
39、eral title Superconductivity, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the
40、 publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The “colour inside” logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore
41、print this publication using a colour printer. 6 61788-12 IEC:2013 INTRODUCTION The copper to non-copper volume ratio of superconducting wires serves as an important numeric value used when determining the critical current density and its stability, which are two of the important characteristics of
42、superconducting wires. This standard is concerned with the standardization of the test method for the copper to non-copper volume ratio of copper stabilized Nb 3 Sn multi-filamentary composite superconducting wires (hereinafter referred to as Cu/Nb 3 Sn wires). Cu/Nb 3 Sn wires can be classified int
43、o four types according to the layout of the stabilizer as shown in Annex G: the external stabilizer type, the internal stabilizer type, the distributed stabilizer type and the contiguous stabilizer with distributed barrier type. The test method specified by this standard may be applicable to a type
44、whose cross-section is of the external stabilizer or the internal stabilizer type regardless of the production process employed. With regard to the internal stabilizer type, the internal structure of some Cu/Nb 3 Sn wires prevents copper from being dissolved and removed. This precludes the applicati
45、on of the copper mass method, unlike with copper matrix Nb-Ti superconducting wires. New methods are therefore needed, as detailed in the following: the paper mass method, where a photo of the cross-section of the wire being measured is traced onto tracing paper, or a copy is made of the photo using
46、 a copying machine; the paper is then cut out into different portions to measure the mass of each piece of paper; the image processing method, where the image of the photo of the cross-section is digitized and the areas are analyzed with software; the copper mass method, where the copper of the spec
47、imen is dissolved in nitric acid solution to leave only the non-copper portion, and to measure the mass of the specimen and the non-copper portion of specimen. This standard is concerned with the paper mass method which is adopted more generally. As supplementary methods, the image processing method
48、 and the copper mass method adopted for Cu/Nb 3 Sn wires are specified in Annex A and Annex B, respectively. The method using a planimeter is specified in Annex C. In Annex D an example of a polishing method is also specified. 61788-12 IEC:2013 7 SUPERCONDUCTIVITY Part 12: Matrix to superconductor v
49、olume ratio measurement Copper to non-copper volume ratio of Nb 3 Sn composite superconducting wires 1 Scope This part of IEC 61788 describes a test method for determining the copper to non-copper volume ratio of Cu/Nb 3 Sn wires. The test method given hereunder is applicable to Nb 3 Sn composite superconducting wires with a cross-sectional area of 0,1 mm 2 to 3,0 mm 2 and a copper to non-copper volume ratio of 0,1
