IEC 61788-12:2013

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
...