IEC 61788-5-2013 Superconductivity - Part 5 Matrix to superconductor volume ratio measurement - Copper to superconductor volume ratio of Cu Nb-Ti composite supe.pdf

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1、 IEC 61788-5 Edition 2.0 2013-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 5: Matrix to superconductor volume ratio measurement Copper to superconductor volume ratio of Cu/Nb-Ti composite superconducting wires Supraconductivit Partie 5: Mesure du rapport volumique matrice/su

2、praconducteur Rapport volumique cuivre/supraconducteur des fils en composite supraconducteur Cu/Nb-Ti IEC 61788-5:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or uti

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16、ation ou si vous avez des questions contactez-nous: csciec.ch. IEC 61788-5 Edition 2.0 2013-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 5: Matrix to superconductor volume ratio measurement Copper to superconductor volume ratio of Cu/Nb-Ti composite superconducting wires Sup

17、raconductivit Partie 5: Mesure du rapport volumique matrice/supraconducteur Rapport volumique cuivre/supraconducteur des fils en composite supraconducteur Cu/Nb-Ti INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE T ICS 17.220.20; 29.050 PRICE CODE CODE PRIX ISBN 9

18、78-2-83220-831-1 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 publi

19、cation via un distributeur agr. 2 61788-5 IEC:2013 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Principle . 7 5 Chemicals 7 6 Apparatus . 7 7 Measurement procedure . 8 Quantity of specimen . 8 7.1Removal of insulating cover material . 8

20、7.2Cleaning 8 7.3Drying . 8 7.4Measurement of specimen mass and its repetition . 8 7.5Dissolving copper 8 7.6Cleaning and drying the Nb-Ti filaments 9 7.7Measurement of dissolved specimen mass and its repetition . 9 7.8Procedural repetition for second specimen 10 7.9 8 Calculation of results 10 9 Un

21、certainty of the test method 10 10 Test report 11 Identification of test specimen . 11 10.1Report of copper to superconductor volume ratio . 11 10.2Report of test conditions 11 10.3 Annex A (normative) Copper to superconductor volume ratio copper mass method 12 Annex B (informative) Specific mass de

22、pending on Nb-Ti fraction . 14 Annex C (information) Mechanical removal of insulating cover materials 15 Annex D (informative) Second etch of specimen . 16 Annex E (informative) Uncertainty considerations . 17 Annex F (informative) Uncertainty evaluation in the test method of copper to superconducto

23、r volume ratio of Cu/Nb-Ti composite superconductors . 22 Table B.1 Specific mass of Nb-Ti . 14 Table E.1 Output signals from two nominally identical extensometers 18 Table E.2 Mean values of two output signals . 18 Table E.3 Experimental standard deviations of two output signals 18 Table E.4 Standa

24、rd uncertainties of two output signals 19 Table E.5 Coefficient of variations of two output signals . 19 61788-5 IEC:2013 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY Part 5: Matrix to superconductor volume ratio measurement Copper to superconductor volume ratio of Cu/Nb-Ti compos

25、ite superconducting wires FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concern

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32、de conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or i

33、ts directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses

34、 arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attentio

35、n 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 any or all such patent rights. International Standard IEC 61788-5 has been prepared by IEC technical committee 90: Superconductivity.

36、 This second edition cancels and replaces the first edition published in 2000. It constitutes a technical revision. The main revisions are the addition of two new annexes, “Uncertainty considerations“ (Annex E) and “Uncertainty evaluation in test method of copper to superconductor volume ratio of Cu

37、/Nb-Ti composite superconductors“ (Annex F). The text of this standard is based on the following documents: FDIS Report on voting 90/321/FDIS 90/324/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. 4 61788-5 IEC:2

38、013 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 61788 series, published under the general title Superconductivity, can be found on the IEC website. The committee has decided that the contents of this publication will remain unch

39、anged 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 publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61788-5 IEC:2013 5 INTRODUCTION The copper to supercond

40、uctor volume ratio of composite superconductors is used mainly to calculate the critical current density of superconducting wires. The test with the method given in this International Standard may be used to provide part of the information needed to determine the suitability of a specific supercondu

41、ctor. Moreover, this method is useful for quality control, acceptance or research testing if the precautions given in this standard are observed. The test method given in this International Standard is based on the condition that the specific mass of Nb-Ti is known or the Nb-Ti alloy fraction is kno

42、wn and Annex B can be used to estimate the specific mass. If the specific mass of Nb-Ti is unknown and the Nb-Ti alloy fraction is unknown and/or the fraction of Nb barrier is unknown, another method to determine the copper to superconductor volume ratio of composite superconductors is described in

43、Annex A. 6 61788-5 IEC:2013 SUPERCONDUCTIVITY Part 5: Matrix to superconductor volume ratio measurement Copper to superconductor volume ratio of Cu/Nb-Ti composite superconducting wires 1 Scope This part of IEC 61788 covers a test method for the determination of copper to superconductor volume ratio

44、 of Cu/Nb-Ti composite superconducting wires. This test method and the alternate method in Annex A are intended for use with Cu/Nb-Ti composite superconducting wires with a cross-sectional area of 0,1 mm 2to 3 mm 2 , a diameter of the Nb-Ti filament(s) of 2 m to 200 m, and a copper to superconductor

45、 volume ratio of 0,5 or more. The Cu/Nb-Ti composite test conductor discussed in this method has a monolithic structure with a round or rectangular cross-section. This test method is carried out by dissolving the copper with nitric acid. Deviations from this test method that are allowed for routine

46、tests and other specific restrictions are given in this standard. Cu/Nb-Ti composite superconducting wires beyond the limits in the cross-sectional area, the filament diameter and the copper to superconductor volume ratio could be measured with this present method with an anticipated reduction of un

47、certainty. Other, more specialized, specimen test geometries may be more appropriate for conductors beyond the limits and have been omitted from this present standard for simplicity and to retain low uncertainty. The test method given in this standard is expected to apply to other superconducting co

48、mposite wires after some appropriate modifications. 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 edi

49、tion of the referenced document (including any amendments) applies. IEC 60050-815 (all parts), International Electrotechnical Vocabulary (available at ) 3 Terms and definitions For the purposes of this document, the definitions given in IEC 60050-815 as well as the following definition apply. 3.1 copper to superconductor volume ratio ratio of the volume of the copper stabilizing material to the volume without copper consisting o