IEC 61788-12:2013

Superconductivity - Part 12: Matrix to superconductor volume ratio measurement - Copper to non-copper volume ratio of Nb₃Sn composite superconducting wires

IEC 61788-12:2013 describes a test method for determining the copper to non-copper volume ratio of Cu/Nb3Sn wires. The test method given hereunder is applicable to Nb3Sn composite superconducting wires with a cross-sectional area of 0,1 mm2 to 3,0 mm2 and a copper to non-copper volume ratio of 0,1 or more. It does not make any reference to the filament diameter; however, it is not applicable to those superconducting wires with their filament, Sn, Cu-Sn alloy, barrier material and other non-copper portions dispersed in the copper matrix or those with the stabilizer dispersed. Furthermore, the copper to non-copper volume ratio can be determined on specimens before or after the Nb3Sn formation heat treatment process. The Cu/Nb3Sn wire has a monolithic structure with a round or rectangular cross-section. Though uncertainty increases, this method may be applicable to the measurement of the copper to non-copper volume ratio of the Cu/Nb3Sn wires whose cross-section and copper to non-copper volume ratio fall outside the specified ranges. This test method may be applied to other composite superconducting wires after some appropriate modifications. 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 annexes, "Uncertainty considerations" and "Uncertainty evaluation in the test method of the copper to non-copper volume ratio of Nb3Sn composite superconducting wires".

Supraconductivité - Partie 12: Mesure du rapport volumique matrice/supraconducteur - Rapport volumique cuivre/non-cuivre des fils en composite supraconducteur Nb₃Sn

La CEI 61788-12:2013 décrit une méthode d'essai de détermination du rapport volumique cuivre/non-cuivre des fils Cu/Nb3Sn. La méthode d'essai donnée dans la présente norme est applicable aux fils en composite supraconducteur Nb3Sn d'une section de 0,1 mm2 à 3,0 mm2 et d'un rapport volumique cuivre/non-cuivre d'au moins 0,1. Elle ne fait aucunement référence au diamètre du filament; cependant, elle n'est pas applicable aux fils supraconducteurs dont le filament, Sn, alliage Cu-Sn, la barrière métallique et autres parties qui ne sont pas en cuivre sont dispersés dans la matrice en cuivre, ainsi qu'aux fils dont le matériau stabilisateur est dispersé. En outre, le rapport volumique cuivre/non-cuivre peut être déterminé sur des éprouvettes avant ou après le processus de traitement thermique de formation du Nb3Sn. Le fil Cu/Nb3Sn a une structure monolithique avec une section ronde ou rectangulaire. Bien que l'incertitude augmente, cette méthode peut être appliquée pour la mesure du rapport volumique cuivre/non-cuivre de fils Cu/Nb3Sn dont la section et le rapport volumique cuivre/non-cuivre ne s'inscrivent pas dans les plages spécifiées ci-dessus. Il est admis d'appliquer cette méthode d'essai à d'autres fils en composite supraconducteur après y avoir apporté certaines modifications appropriées. Cette deuxième édition annule et remplace la première édition parue en 2002, dont elle constitue une révision technique. La principale révision est l'ajout de deux nouvelles annexes, "Considérations relatives à l'incertitude" et "Evaluation de l'incertitude de la méthode d'essai du rapport volumique cuivre/non-cuivre des fils en composite supraconducteur Nb3Sn".

General Information

• Status: Published
• Publication Date: 11-Jun-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.050 - Superconductivity and conducting materials
• ICS: 33.060.30 - Radio relay and fixed satellite communications systems
• Technical Committee: TC 90 - Superconductivity
• Drafting Committee: WG 6 - TC 90/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jul-2013
• Completion Date: 12-Jun-2013

Relations

• Revises: IEC 61788-12:2002 - Superconductivity - Part 12: Matrix to superconductor volume ratio measurement - Copper to non-copper volume ratio of Nb3Sn composite superconducting wires
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61788-12 ®
Edition 2.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 12: Matrix to superconductor volume ratio measurement – Copper to non-
copper volume ratio of Nb Sn composite superconducting wires
Supraconductivité –
Partie 12: Mesure du rapport volumique matrice/supraconducteur –
Rapport volumique cuivre/non-cuivre des fils en composite supraconducteur
Nb Sn
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IEC 61788-12 ®
Edition 2.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 12: Matrix to superconductor volume ratio measurement – Copper to non-

copper volume ratio of Nb Sn composite superconducting wires

Supraconductivité –
Partie 12: Mesure du rapport volumique matrice/supraconducteur –

Rapport volumique cuivre/non-cuivre des fils en composite supraconducteur

Nb Sn
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 29.050 ISBN 978-2-83220-864-9

– 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
6.1 Preparation of specimen . 8
6.1.1 General . 8
6.1.2 Procedures . 8
6.2 Measurement . 9
6.2.1 Photo of cross-section . 9
6.2.2 Transfer . 9
6.2.3 Cutting. 9
6.2.4 Measurement of paper mass . 9
6.3 Test procedure for the second specimen . 9
6.4 Paper mass . 9
7 Calculation of results . 9
8 Uncertainty of the test method . 10
9 Test report . 10
9.1 Copper to non-copper volume ratio . 10
9.2 Identification of test specimen . 10
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 copper to non-copper volume ratio before and
after the Nb Sn generation heat treatment process . 15
Annex F (informative) Paper mass bias at copy . 16
Annex G (informative) Cross-sections of Cu/Nb Sn wires . 17
Annex H (informative) Uncertainty considerations . 18
Annex I (informative) Uncertainty evaluation in the test method of the copper to
non-copper volume ratio of Nb Sn composite superconducting wires. 23
Figure G.1 – Cross-sections of four Cu/Nb 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 extensometers . 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 COMMISSION
____________
SUPERCONDUCTIVITY –
Part 12: Matrix to superconductor volume ratio measurement – Copper to
non-copper volume ratio of Nb Sncomposite superconducting wires
FOREWORD
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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 annexes, "Uncertainty
considerations" (Annex H) and "Uncertainty evaluation in the test method of the copper to
non-copper volume ratio of Nb Sn composite superconducting wires" (Annex I).
The text of this standard is based
...