Title :
Intermediate scale industrially processed Nb3Sn(Ti) by powder metallurgy
Author :
Pourrahimi, S. ; Thieme, C.L.H. ; Foner, S.
Author_Institution :
MIT, Cambridge, MA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
Powder metallurgy processing of Nb3Sn(Ti) wire was scaled up to 75-mm-diameter billets, each containing 4 kg of pressed powder composite. Prealloyed Nb-1.5-wt.% Ti powder was used for optimum high-field properties. An initial hot extrusion step provided complete consolidation and excellent integrity of the powder composite. Using the extruded bars, various single and multiple tin core billets were prepared and hydrostatically extruded to 12-mm-diameter bars. Long lengths of internal tin core wire were drawn without any breakage to less than 1 mm diameter. To evaluate the performance of long-length wires, small magnets were fabricated from these wires and tested in background fields of water-cooled Bitter magnets up to 20 T. The processing, performance, and microstructure of these small magnets are discussed. This intermediate-scale process used conventional metal-forming techniques that can be scaled to larger scale industrial processing
Keywords :
crystal microstructure; drawing (mechanical); extrusion; niobium alloys; powder metallurgy; superconducting magnets; tin alloys; titanium alloys; type II superconductors; 1 mm; 12 mm; 75 mm; Nb3Sn; Nb3Ti; complete consolidation; conventional metal-forming techniques; core billets; drawing; hydrostatic extrusion; initial hot extrusion step; intermediate-scale process; long-length wires; microstructure; optimum high-field properties; powder metallurgy; pressed powder composite; small magnets; water-cooled Bitter magnets; Bars; Billets; Magnetic cores; Magnets; Microstructure; Niobium; Powders; Testing; Tin; Wire drawing;
Journal_Title :
Magnetics, IEEE Transactions on
