ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A Cu92.5Nb5Sn2.5 alloy has been rapidly quenched into a powder by ultrasonic gas atomization. The structure of the powder consists of finely dispersed Nb particles in a Cu-Sn matrix. The powder has been consolidated by hot extrusion at 650°C. The extrusion does not change the phases present in the material appreciably but annealing for 100 h at 650°C causes a transformation of the Nb particles to Nb3Sn. The extruded material shows superconductivity. The critical temperatureT c, of the asquenched alloys is 8.0 K but increases to 15.6 K after annealing for 100 h at 923 K. The upper critical magnetic field, $$H_{C_2 } $$ , and critical current density,J c, were 3.4 kOe at 4.2 K and 7.4×105 Am−2 at zero applied field and 4.2 K, respectively. The appearance of superconductivity is attributed to the proximity effect of the Nb3Sn phase particles which are sufficiently well distributed to satisfy the leak distance and the critical particle size.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01184997
Permalink
