Formation of metal filaments by solid state reactions.
Leavenworth HW Jr.; Dunning BW Jr.; Gabler RC Jr.; Goldsmith CE
U S Pat 3 852 060 1974 Dec; :
Cu, fe, or cu-fe duplex filaments are grown from a solid matte of cu, fe, and s which is stoichiometrically deficient in s. Growth occurs in a nonreacting atmosphere consisting of n2 or a vacuum of no more than 0.05 Torr. The matte is prepared by heating cu, fe, and s to >800 deg. C and contains 10-30 s and 30-60 pct cu. The cooled matte is then ground and heated to >300 deg. C to grow approximately 1 mm diameter filaments from the particle surfaces. Lengths of 2-3 cm are attained after several minutes. The matte is cooled, and the metal filaments are detached from the particle surfaces.
U.S. Pat. 3,852,060; Dec. 3, 1974; Chem. Abstr. 82:89,456V