BS EN 61788-12:2013
$142.49
Superconductivity – Matrix to superconductor volume ratio measurement. Copper to non-copper volume ratio of Nb3Sn composite superconducting wires
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 32 |
IEC 61788-12:2013 describes a test method for determining the copper to non-copper volume ratio of Cu/Nb 3Sn wires. The test method given hereunder is applicable to Nb 3Sn 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 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 Nb 3Sn formation heat treatment process. The Cu/Nb 3Sn 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/Nb 3Sn 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 Nb 3Sn composite superconducting wires”.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Principle 5 Apparatus 6 Measurement procedure 6.1 Preparation of specimen 6.1.1 General 6.1.2 Procedures |
| 11 | 6.2 Measurement 6.2.1 Photo of cross-section 6.2.2 Transfer 6.2.3 Cutting 6.2.4 Measurement of paper mass 6.3 Test procedure for the second specimen 6.4 Paper mass 7 Calculation of results |
| 12 | 8 Uncertainty of the test method 9 Test report 9.1 Copper to non-copper volume ratio 9.2 Identification of test specimen |
| 13 | Annex A (normative) Measurement – Image processing method |
| 14 | Annex B (normative) Measurement – Copper mass method |
| 15 | Annex C (normative) Measurement method using planimeter |
| 16 | Annex D (informative) Specimen polishing method |
| 17 | Annex E (informative) Difference of the copper to non-copper volume ratio before and after the Nb3Sn generation heat treatment process |
| 18 | Annex F (informative) Paper mass bias at copy |
| 19 | Annex G (informative) Cross-sections of Cu/Nb3Sn wires Figures Figure G.1 – Cross-sections of four Cu/Nb3Sn wire types according to the layout of the stabilizer |
| 20 | Annex H (informative) Uncertainty considerations |
| 21 | Tables Table H.1 – Output signals from two nominally identical extensometers Table H.2 – Mean values of two output signals Table H.3 – Experimental standard deviations of two output signals |
| 22 | Table H.4 – Standard uncertainties of two output signals Table H.5 – Coefficient of variations of two output signals |
| 25 | Annex I (informative) Uncertainty evaluation in the test method of the copper to non-copper volume ratio of Nb3Sn composite superconducting wires |
